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26
.github/workflows/verify.yml vendored
View file

@ -1,26 +0,0 @@
name: C/C++ CI
on:
push:
branches: [ gh-workflow ]
pull_request:
branches: [ gh-workflow ]
jobs:
build:
runs-on: ubuntu-18.04
steps:
- uses: actions/checkout@v3
- name: make
run: make -C src
- name: copy
run: |
mkdir -p artifacts
cp -v src/checkrt src/exec.so artifacts
- name: upload
uses: actions/upload-artifact@v3
with:
name: binaries
path: artifacts/*

12
.gitignore vendored
View file

@ -1,11 +1,3 @@
/AppRun.c
/AppRun_patched*
*.o
*.so
*.gz
src/*_test
src/checkrt
src/res.h
src/cxx/
src/gcc/

22
.travis.yml Normal file
View file

@ -0,0 +1,22 @@
language: c
compiler: gcc
services:
- docker
env:
- ARCH=i686 DOCKER_IMAGE=toopher/centos-i386:centos6
- ARCH=x86_64 DOCKER_IMAGE=library/centos:6.8
script:
- mkdir -p ./out/
- docker run -i -v ${PWD}/out:/out -v "${PWD}:/AppImageKit-checkrt" "$DOCKER_IMAGE" /bin/bash -c "yum -y install gcc wget make binutils glibc-devel patch ; make -C /AppImageKit-checkrt ; cp /AppImageKit-checkrt/AppRun_patched out/AppRun-patched-${ARCH} ; cp /AppImageKit-checkrt/exec.so out/exec-${ARCH}.so"
- ls -lh out/*
- wget -c https://github.com/probonopd/uploadtool/raw/master/upload.sh
- bash ./upload.sh out/*
branches:
except:
- # Do not build tags that we create when we upload to GitHub Releases
- /^(?i:continuous)$/

29
AppRun
View file

@ -1,29 +0,0 @@
#!/bin/sh -e
# Force xcb platform for Qt applications
if [ -z "${QT_QPA_PLATFORM}" ]; then
export QT_QPA_PLATFORM=xcb
fi
# add your command to execute here
exec=
cd "$(dirname "$0")"
if [ "x$exec" = "x" ]; then
exec="$(sed -n 's|^Exec=||p' *.desktop | head -1)"
fi
if [ -x "./usr/optional/checkrt" ]; then
extra_libs="$(./usr/optional/checkrt)"
fi
if [ -n "$extra_libs" ]; then
export LD_LIBRARY_PATH="${extra_libs}${LD_LIBRARY_PATH}"
if [ -e "$PWD/usr/optional/exec.so" ]; then
export LD_PRELOAD="$PWD/usr/optional/exec.so:${LD_PRELOAD}"
fi
fi
#echo ">>>>> $LD_LIBRARY_PATH"
#echo ">>>>> $LD_PRELOAD"
./usr/bin/$exec "$*"
exit $?

98
AppRun.c.patch Normal file
View file

@ -0,0 +1,98 @@
--- a/AppRun.c
+++ b/AppRun.c
@@ -32,6 +32,7 @@
#include <dirent.h>
#include <string.h>
#include <errno.h>
+#include <wait.h>
#define die(...) \
do { \
@@ -102,6 +103,11 @@
line[n] = '\0';
}
+ int pid;
+ if ((pid = fork()) == -1) {
+ int error = errno;
+ die("fork() failed: %s\n", strerror(error));
+ } else if (pid == 0) {
// count arguments
char* arg = exe;
int argcount = 0;
@@ -165,6 +171,11 @@
size_t length;
const char *format;
+ checkrt(usr_in_appdir);
+
+ if (optional_ld_preload)
+ putenv(optional_ld_preload);
+
/* https://docs.python.org/2/using/cmdline.html#envvar-PYTHONHOME */
SET_NEW_ENV(new_pythonhome, appdir_s, "PYTHONHOME=%s/usr/", appdir);
@@ -172,7 +183,7 @@
SET_NEW_ENV(new_path, appdir_s*5 + strlen(old_env), "PATH=%s/usr/bin/:%s/usr/sbin/:%s/usr/games/:%s/bin/:%s/sbin/:%s", appdir, appdir, appdir, appdir, appdir, old_env);
old_env = getenv("LD_LIBRARY_PATH") ?: "";
- SET_NEW_ENV(new_ld_library_path, appdir_s*10 + strlen(old_env), "LD_LIBRARY_PATH=%s/usr/lib/:%s/usr/lib/i386-linux-gnu/:%s/usr/lib/x86_64-linux-gnu/:%s/usr/lib32/:%s/usr/lib64/:%s/lib/:%s/lib/i386-linux-gnu/:%s/lib/x86_64-linux-gnu/:%s/lib32/:%s/lib64/:%s", appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, old_env);
+ SET_NEW_ENV(new_ld_library_path, strlen(optional_ld_library_path) + appdir_s*10 + strlen(old_env), "LD_LIBRARY_PATH=%s%s/usr/lib/:%s/usr/lib/i386-linux-gnu/:%s/usr/lib/x86_64-linux-gnu/:%s/usr/lib32/:%s/usr/lib64/:%s/lib/:%s/lib/i386-linux-gnu/:%s/lib/x86_64-linux-gnu/:%s/lib32/:%s/lib64/:%s", optional_ld_library_path, appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, appdir, old_env);
old_env = getenv("PYTHONPATH") ?: "";
SET_NEW_ENV(new_pythonpath, appdir_s + strlen(old_env), "PYTHONPATH=%s/usr/share/pyshared/:%s", appdir, old_env);
@@ -196,16 +207,29 @@
/* Otherwise may get errors because Python cannot write __pycache__ bytecode cache */
putenv("PYTHONDONTWRITEBYTECODE=1");
- /* Run */
- ret = execvp(exe, outargptrs);
+ /* Set pid & ppid */
+ pid_t pid = getpid();
+ pid_t ppid = getppid();
- int error = errno;
+ int pid_len = snprintf(NULL, 0, "%d", pid);
+ int ppid_len = snprintf(NULL, 0, "%d", ppid);
- if (ret == -1)
- die("Error executing '%s': %s\n", exe, strerror(error));
+ char *s_pid = malloc(pid_len + 1);
+ snprintf(s_pid, pid_len + 1, "%d", pid);
+
+ char *s_ppid = malloc(ppid_len + 1);
+ snprintf(s_ppid, ppid_len + 1, "%d", ppid);
+
+ setenv("PID", s_pid, 1);
+ setenv("PPID", s_ppid, 1);
+
+ /* Run */
+ execvp(exe, outargptrs);
+
+ free(optional_ld_library_path);
+ if (optional_ld_preload)
+ free(optional_ld_preload);
- free(line);
- free(desktop_file);
free(usr_in_appdir);
free(new_pythonhome);
free(new_path);
@@ -215,5 +239,16 @@
free(new_perllib);
free(new_gsettings_schema_dir);
free(new_qt_plugin_path);
- return 0;
+
+ int error = errno;
+ die("Error executing '%s': %s\n", exe, strerror(error));
+ }
+
+ int status = 0;
+ int rv = waitpid(pid, &status, 0);
+ status = rv > 0 && WIFEXITED (status) ? WEXITSTATUS (status) : 1;
+
+ free(line);
+ free(desktop_file);
+ return status;
}

64
AppRun.sh Executable file
View file

@ -0,0 +1,64 @@
#!/bin/sh -e
# A shell script that does the same as the binaries in the release section.
cxxpre=""
gccpre=""
execpre=""
libc6arch="libc6,x86-64"
exec="$APPDIR/usr/bin/$(sed -n -e 's|%f||' -e 's|^Exec=||p' $(ls -1 $APPDIR/*.desktop))"
if [ -n "$APPIMAGE" ] && [ "$(file -b "$APPIMAGE" | cut -d, -f2)" != " x86-64" ]; then
libc6arch="libc6"
fi
if [ -e "$APPDIR/usr/optional/libstdc++/libstdc++.so.6" ]; then
lib="$(PATH="/sbin:$PATH" ldconfig -p | grep "libstdc++\.so\.6 ($libc6arch)" | awk 'NR==1{print $NF}')"
sym_sys=$(tr '\0' '\n' < "$lib" | grep -e '^GLIBCXX_3\.4' | sort -V | tail -n1)
sym_app=$(tr '\0' '\n' < "$APPDIR/usr/optional/libstdc++/libstdc++.so.6" | grep -e '^GLIBCXX_3\.4' | sort -V | tail -n1)
if [ "$(printf "${sym_sys}\n${sym_app}"| sort -V | tail -1)" != "$sym_sys" ]; then
cxxpath="$APPDIR/usr/optional/libstdc++:"
fi
fi
if [ -e "$APPDIR/usr/optional/libgcc/libgcc_s.so.1" ]; then
lib="$(PATH="/sbin:$PATH" ldconfig -p | grep "libgcc_s\.so\.1 ($libc6arch)" | awk 'NR==1{print $NF}')"
sym_sys=$(tr '\0' '\n' < "$lib" | grep -e '^GCC_[0-9]\\.[0-9]' | sort -V | tail -n1)
sym_app=$(tr '\0' '\n' < "$APPDIR/usr/optional/libgcc/libgcc_s.so.1" | grep -e '^GCC_[0-9]\\.[0-9]' | sort -V | tail -n1)
if [ "$(printf "${sym_sys}\n${sym_app}"| sort -V | tail -1)" != "$sym_sys" ]; then
gccpath="$APPDIR/usr/optional/libgcc:"
fi
fi
if [ -n "$cxxpath" ] || [ -n "$gccpath" ]; then
if [ -e "$APPDIR/usr/optional/exec.so" ]; then
execpre=""
export LD_PRELOAD="$APPDIR/usr/optional/exec.so:${LD_PRELOAD}"
fi
export LD_LIBRARY_PATH="${cxxpath}${gccpath}${LD_LIBRARY_PATH}"
fi
# Force xcb platform for Qt applications
if [ -z "${QT_QPA_PLATFORM}" ]; then
export QT_QPA_PLATFORM=xcb
fi
# Find correct root CA file
_POSSIBLE_CERTIFICATES="/etc/ssl/certs/ca-bundle.crt \
/etc/ssl/certs/ca-certificates.crt /etc/pki/tls/certs/ca-bundle.crt \
/etc/ssl/ca-bundle.pem /etc/pki/tls/cacert.pem"
if [ -z "$SSL_CERT_FILE" ]; then
for i in $_POSSIBLE_CERTIFICATES; do
if [ -f "$i" ]; then
export SSL_CERT_FILE="$i"
break
fi
done
fi
#echo ">>>>> $LD_LIBRARY_PATH"
#echo ">>>>> $LD_PRELOAD"
exec $exec "$@"

23
COPYING
View file

@ -1,23 +0,0 @@
checkrt.c: 2022 <djcj@gmx.de>
env.c exec.c: 2018 Pablo Marcos Oltra <pablo.marcos.oltra@gmail.com>
The MIT License
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

43
Makefile Normal file
View file

@ -0,0 +1,43 @@
CFLAGS ?= -O2 -Wall -Wextra
LDFLAGS += -s
BIN = AppRun_patched
LIB = exec.so
EXEC_TEST = exec_test
ENV_TEST = env_test
checkrt: $(BIN) $(LIB)
test: $(EXEC_TEST) $(ENV_TEST)
all: checkrt test
clean:
-rm -f $(BIN) $(LIB) $(EXEC_TEST) $(ENV_TEST) *.o AppRun.c AppRun_patched.c
$(BIN): AppRun_patched.o checkrt.o env.o
$(LIB): exec.o env.o
$(CC) -shared $(LDFLAGS) -o $@ $^ -ldl
AppRun_patched.o checkrt.o: CFLAGS += -include checkrt.h
exec.o env.o: CFLAGS += -fPIC
$(EXEC_TEST): CFLAGS += -DEXEC_TEST
$(EXEC_TEST): exec.c env.c
$(CC) -o $@ $(CFLAGS) $^ -ldl
$(ENV_TEST): CFLAGS += -DENV_TEST
$(ENV_TEST): env.c
$(CC) -o $@ $(CFLAGS) $^
run_tests: $(EXEC_TEST) $(ENV_TEST)
./$(ENV_TEST)
./$(EXEC_TEST)
AppRun_patched.c: AppRun.c
patch -p1 --output $@ < AppRun.c.patch
AppRun.c:
wget -c "https://raw.githubusercontent.com/AppImage/AppImageKit/master/src/AppRun.c"
.PHONY: checkrt test run_tests all clean

48
README.md
View file

@ -1,45 +1,24 @@
# The problem
Some projects require newer C++ standards to build them. To keep the glibc
dependency low you can build a newer GCC version on an older distro and use it
to compile the project. This project however will now require a newer version of
the `libstdc++.so.6` library than available on that distro.
Blindly bundling `libstdc++.so.6` however will in most cases break compatibility
with distros that have a newer library version installed into their system than
the bundled one.
Some projects require newer C++ standards to build them. To keep the glibc dependency low you can
build a newer GCC version on an older distro and use it to compile the project.
This project however will now require a newer version of the `libstdc++.so.6` library than available on that distro.
Bundling `libstdc++.so.6` however will in most cases break compatibility with distros that have a newer library
version installed into their system than the bundled one. So blindly bundling the library is not reliable.
By the way, while this is primarily an issue with `libstdc++.so.6` in some cases
this might also occur with `libgcc_s.so.1`. That's because both libraries are
part of GCC.
By the way, while this is primarily an issue with `libstdc++.so.6` in some rare cases this might also occur with `libgcc_s.so.1`.
That's because both libraries are part of GCC.
# The solution
You would have to know the library version of the host system and decide whether
to use a bundled library or not before the application is started. This is
exactly what the `checkrt` tool does. It will search for a bundled `libstdc++.so.6`
and `libgcc_s.so.1` library inside sub-directories next to it. If found it will
compare their internal versions with the ones found on the system and return a
path that can be prepended to `LD_LIBRARY_PATH`.
You would have to know the library version of the host system and decide whether to use a bundled library or not before the
application is started. This is exactly what the patched AppRun binary does.
It will search for `usr/optional/libstdc++/libstdc++.so.6` and `usr/optional/libgcc_s/libgcc_s.so.1` inside the AppImage or AppDir.
If found it will compare their internal versions with the ones found on the system and prepend their paths to `LD_LIBRARY_PATH` if necessary.
# Usage
Compile by running `make` inside the `src` directory.
Inside your AppDir create the directory `usr/optional/`
and put the binary `checkrt` inside there. Execute `usr/optional/checkrt --copy-libraries`
to bundle your system's `libstdc++.so.6` and `libgcc_s.so.1` libraries.
Use the provided AppRun script or write/modify your own. `checkrt` will either
return a path that can be added to `LD_LIBRARY_PATH` or an empty string.
Error messages, help and verbosity will always be returned to stderr.
# exec.so
You might also want to bundle `exec.so` inside `usr/optional/`. This library is
intended to restore the environment of the AppImage to its parent. This is done
to avoid library clashing of bundled libraries with external processes, e.g. when
running the web browser.
You should also put `exec.so` into `usr/optional`. This exec.so library is intended to restore the environment of the AppImage to its parent.
This is done to avoid library clashing of bundled libraries with external processes. e.g when running the web browser
The intended usage is as follows:
@ -54,4 +33,3 @@ The intended usage is as follows:
In case it's an external process, it will restore the environment of
the AppImage parent by reading `/proc/[pid]/environ`.
This is the conservative approach taken.

135
checkrt.c Normal file
View file

@ -0,0 +1,135 @@
/* Copyright (c) 2017-2018 djcj <djcj@gmx.de>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "debug.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#ifndef LIBC6_ARCH
# if (__WORDSIZE == 64)
# define LIBC6_ARCH "libc6,x86-64"
# else
# define LIBC6_ARCH "libc6"
# endif
#endif
#define LINE_SIZE 255
#define SCANLIB(lib,sym,regex) \
sprintf(command, format, lib, regex); \
f = popen(command, "r"); \
ret = fscanf(f, "%s", sym); (void)ret; \
pclose(f);
#define CXXDIR "optional/libstdc++"
#define GCCDIR "optional/libgcc"
#define EXEC_SO "optional/exec.so"
char *optional_ld_library_path = NULL;
char *optional_ld_preload = NULL;
void checkrt(char *usr_in_appdir)
{
int ret;
FILE *f;
char command[LINE_SIZE];
char stdcxx_sys_lib[LINE_SIZE], gcc_sys_lib[LINE_SIZE];
char stdcxx_sys_sym[LINE_SIZE], gcc_sys_sym[LINE_SIZE];
char stdcxx_bundle_sym[LINE_SIZE], gcc_bundle_sym[LINE_SIZE];
int stdcxx_sys_ver=1, stdcxx_bundle_ver=0, gcc_sys_ver=1, gcc_bundle_ver=0;
char *stdcxx_bundle_lib = "./" CXXDIR "/libstdc++.so.6";
char *gcc_bundle_lib = "./" GCCDIR "/libgcc_s.so.1";
const char *format = "tr '\\0' '\\n' < '%s' | grep -e '%s' | sort -V | tail -n1";
if (access(stdcxx_bundle_lib, F_OK) == 0) {
f = popen("PATH=\"/sbin:$PATH\" ldconfig -p | grep 'libstdc++.so.6 (" LIBC6_ARCH ")' | awk 'NR==1{print $NF}'", "r");
ret = fscanf(f, "%s", stdcxx_sys_lib); (void)ret;
pclose(f);
if (access(stdcxx_sys_lib, F_OK) == 0) {
SCANLIB(stdcxx_sys_lib, stdcxx_sys_sym, "^GLIBCXX_3\\.4");
SCANLIB(stdcxx_bundle_lib, stdcxx_bundle_sym, "^GLIBCXX_3\\.4");
stdcxx_sys_ver = atoi(stdcxx_sys_sym+12);
stdcxx_bundle_ver = atoi(stdcxx_bundle_sym+12);
DEBUG("%s ==> %s (%d)\n", stdcxx_sys_lib, stdcxx_sys_sym, stdcxx_sys_ver);
DEBUG("%s ==> %s (%d)\n\n", stdcxx_bundle_lib, stdcxx_bundle_sym, stdcxx_bundle_ver);
}
}
if (access(gcc_bundle_lib, F_OK) == 0) {
f = popen("PATH=\"/sbin:$PATH\" ldconfig -p | grep 'libgcc_s.so.1 (" LIBC6_ARCH ")' | awk 'NR==1{print $NF}'", "r");
ret = fscanf(f, "%s", gcc_sys_lib); (void)ret;
pclose(f);
if (access(gcc_sys_lib, F_OK) == 0) {
SCANLIB(gcc_sys_lib, gcc_sys_sym, "^GCC_[0-9]\\.[0-9]");
SCANLIB(gcc_bundle_lib, gcc_bundle_sym, "^GCC_[0-9]\\.[0-9]");
gcc_sys_ver = atoi(gcc_sys_sym+4) * 100 + atoi(gcc_sys_sym+6) * 10 + atoi(gcc_sys_sym+8);
gcc_bundle_ver = atoi(gcc_bundle_sym+4) * 100 + atoi(gcc_bundle_sym+6) * 10 + atoi(gcc_bundle_sym+8);
DEBUG("%s ==> %s (%d)\n", gcc_sys_lib, gcc_sys_sym, gcc_sys_ver);
DEBUG("%s ==> %s (%d)\n\n", gcc_bundle_lib, gcc_bundle_sym, gcc_bundle_ver);
}
}
int bundle_cxx = 0;
int bundle_gcc = 0;
size_t len = strlen(usr_in_appdir);
if (stdcxx_bundle_ver > stdcxx_sys_ver)
bundle_cxx = 1;
if (gcc_bundle_ver > gcc_sys_ver)
bundle_gcc = 1;
char *exec_file = malloc(strlen(usr_in_appdir) + 1 + strlen(EXEC_SO) + 1);
sprintf(exec_file, "%s/%s", usr_in_appdir, EXEC_SO);
f = fopen(exec_file, "r");
if (f) {
char *old_ld_preload = getenv("LD_PRELOAD");
optional_ld_preload = malloc(strlen(EXEC_SO) + (old_ld_preload ? 1+strlen(old_ld_preload) : 0) + 13 + len);
sprintf(optional_ld_preload, "LD_PRELOAD=%s%s%s", exec_file,
old_ld_preload ? ":" : "", old_ld_preload ? old_ld_preload : "");
DEBUG("optional_ld_preload: %s\n", optional_ld_preload);
fclose(f);
}
free(exec_file);
if (bundle_cxx == 1 && bundle_gcc == 0) {
optional_ld_library_path = malloc(strlen(CXXDIR) + 3 + len);
sprintf(optional_ld_library_path, "%s/" CXXDIR ":", usr_in_appdir);
} else if (bundle_cxx == 0 && bundle_gcc == 1) {
optional_ld_library_path = malloc(strlen(GCCDIR) + 3 + len);
sprintf(optional_ld_library_path, "%s/" GCCDIR ":", usr_in_appdir);
} else if (bundle_cxx == 1 && bundle_gcc == 1) {
optional_ld_library_path = malloc(strlen(GCCDIR) + strlen(CXXDIR) + 5 + len*2);
sprintf(optional_ld_library_path, "%s/" GCCDIR ":%s/" CXXDIR ":", usr_in_appdir, usr_in_appdir);
} else {
optional_ld_library_path = malloc(2);
sprintf(optional_ld_library_path, "%s", "");
}
DEBUG("optional_ld_library_path: %s\n", optional_ld_library_path);
}

8
checkrt.h Normal file
View file

@ -0,0 +1,8 @@
#ifndef CHEKRT_H
#define CHECKRT_H
extern char *optional_ld_library_path;
extern char *optional_ld_preload;
extern void checkrt(char *usr_in_appdir);
#endif

12
src/env.h → debug.h
View file

@ -1,16 +1,12 @@
#ifndef ENV_H
#define END_H
#ifndef DEBUG_H
#define DEBUG_H
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
pid_t get_parent_pid();
char* const* read_parent_env();
void env_free(char* const *env);
#define DEBUG(...) do { \
if (getenv("APPIMAGE_CHECKRT_DEBUG")) \
printf("APPIMAGE_CHECKRT>> " __VA_ARGS__); \
} while (0)
#endif
#endif // DEBUG_H

5
src/env.c → env.c Normal file → Executable file
View file

@ -21,14 +21,15 @@
#define _GNU_SOURCE
#include "env.h"
#include "debug.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include "env.h"
static char** env_allocate(size_t size) {
return calloc(size + 1, sizeof(char*));
}

10
env.h Executable file
View file

@ -0,0 +1,10 @@
#ifndef ENV_H
#define END_H
#include <unistd.h>
pid_t get_parent_pid();
char* const* read_parent_env();
void env_free(char* const *env);
#endif

5
src/exec.c → exec.c
View file

@ -41,14 +41,15 @@
#define _GNU_SOURCE
#include "env.h"
#include "debug.h"
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <string.h>
#include <errno.h>
#include "env.h"
typedef int (*execve_func_t)(const char *filename, char *const argv[], char *const envp[]);
#define MIN(X,Y) ((X) < (Y) ? (X) : (Y))

73
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@ -1,73 +0,0 @@
GCC RUNTIME LIBRARY EXCEPTION
Version 3.1, 31 March 2009
Copyright (C) 2009 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
This GCC Runtime Library Exception ("Exception") is an additional
permission under section 7 of the GNU General Public License, version
3 ("GPLv3"). It applies to a given file (the "Runtime Library") that
bears a notice placed by the copyright holder of the file stating that
the file is governed by GPLv3 along with this Exception.
When you use GCC to compile a program, GCC may combine portions of
certain GCC header files and runtime libraries with the compiled
program. The purpose of this Exception is to allow compilation of
non-GPL (including proprietary) programs to use, in this way, the
header files and runtime libraries covered by this Exception.
0. Definitions.
A file is an "Independent Module" if it either requires the Runtime
Library for execution after a Compilation Process, or makes use of an
interface provided by the Runtime Library, but is not otherwise based
on the Runtime Library.
"GCC" means a version of the GNU Compiler Collection, with or without
modifications, governed by version 3 (or a specified later version) of
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"GPL-compatible Software" is software whose conditions of propagation,
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You have permission to propagate a work of Target Code formed by
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consistent with the licensing of the Independent Modules.
2. No Weakening of GCC Copyleft.
The availability of this Exception does not imply any general
presumption that third-party software is unaffected by the copyleft
requirements of the license of GCC.

23
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@ -1,23 +0,0 @@
Copyright (C) 1989-2022 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>.

22
src/COPYING.libstdc++
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@ -1,22 +0,0 @@
Copyright (C) 1997-2022 Free Software Foundation, Inc.
This file is part of the GNU ISO C++ Library. This library is free
software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option)
any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>.

674
src/COPYING3
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@ -1,674 +0,0 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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Preamble
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Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

52
src/Makefile
View file

@ -1,52 +0,0 @@
BIN = checkrt
LIB = exec.so
EXEC_TEST = exec_test
ENV_TEST = env_test
CHECKRT_TEST = checkrt_test
CFLAGS := -Wall -O3
LDFLAGS := -s
all: $(BIN) $(LIB)
clean:
-rm -f *.o *.gz res.h $(BIN) $(LIB) $(EXEC_TEST) $(ENV_TEST) $(CHECKRT_TEST)
distclean: clean
-rm -rf cxx gcc
$(BIN): checkrt.o
$(CC) -o $@ $^ $(LDFLAGS) -ldl
checkrt.c: res.h
res.h:
gzip -k -f COPYING.RUNTIME COPYING3 && \
xxd -i COPYING.RUNTIME.gz > $@ && \
xxd -i COPYING3.gz >> $@ && \
xxd -i COPYING.libgcc >> $@ && \
xxd -i COPYING.libstdc++ >> $@
exec.o env.o: CFLAGS += -fPIC
$(LIB): exec.o env.o
$(CC) -o $@ $^ -shared $(LDFLAGS) -ldl
$(CHECKRT_TEST): checkrt.c
$(CC) -o $@ $(CFLAGS) -DCHECKRT_TEST $^ -ldl
$(EXEC_TEST): exec.c env.o
$(CC) -o $@ $(CFLAGS) -DEXEC_TEST $^ -ldl
$(ENV_TEST): env.c
$(CC) -o $@ $(CFLAGS) -DENV_TEST $^
run_tests: $(BIN) $(EXEC_TEST) $(ENV_TEST) $(CHECKRT_TEST)
./$(ENV_TEST)
./$(EXEC_TEST)
./$(CHECKRT_TEST)
./patch_libs.sh && ./$(BIN) -v
.PHONY: $(BIN) all clean

397
src/checkrt.c
View file

@ -1,397 +0,0 @@
/* Copyright (c) 2022 <djcj@gmx.de>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <link.h>
#include <dlfcn.h>
#include <elf.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>
#include "res.h"
#ifdef __x86_64__
typedef Elf64_Ehdr Elf_Ehdr;
typedef Elf64_Shdr Elf_Shdr;
typedef Elf64_Sym Elf_Sym;
#else
typedef Elf32_Ehdr Elf_Ehdr;
typedef Elf32_Shdr Elf_Shdr;
typedef Elf32_Sym Elf_Sym;
#endif
#define LIBGCC_S_SO "libgcc_s.so.1"
#define LIBSTDCXX_SO "libstdc++.so.6"
#define LIBGCC_DIR "gcc"
#define STDCXX_DIR "cxx"
#define MAX(X,Y) (((X) > (Y)) ? (X) : (Y))
#define PRINT_VERBOSE(FMT, ...) if (verbose) { fprintf(stderr, FMT, __VA_ARGS__); }
static char *get_libpath(const char *lib, char verbose)
{
struct link_map *map = NULL;
char *path;
/* It's very important to use dlmopen() together with the argument LM_ID_NEWLM,
* otherwise the bundled library and the system library will use the same
* namespace and the path of the bundled library might be returned when you
* expected the system one.
*/
void *handle = dlmopen(LM_ID_NEWLM, lib, RTLD_LAZY);
if (!handle) {
PRINT_VERBOSE("error: failed to dlmopen() file: %s\n", lib);
return NULL;
}
if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == -1) {
PRINT_VERBOSE("error: could not retrieve information: %s\n", lib);
dlclose(handle);
return NULL;
}
path = strdup(map->l_name);
dlclose(handle);
return path;
}
static int symbol_version(const char *lib, const char *sym_prefix, char verbose)
{
int fd = -1;
void *addr = NULL;
const char *error = "";
/* let dlopen() do all the compatibility checks */
char *orig = get_libpath(lib, verbose);
if (!orig) return -1;
fd = open(orig, O_RDONLY);
if (fd < 0) {
PRINT_VERBOSE("error: failed to open() file: %s\n", orig);
free(orig);
return -1;
}
if (verbose) {
if (strcmp(lib, orig) == 0) {
fprintf(stderr, "%s\n", orig);
} else {
fprintf(stderr, "%s -> %s\n", lib, orig);
}
}
free(orig);
/* make sure file size is larger than the required ELF header size */
struct stat st;
if (fstat(fd, &st) < 0 || st.st_size < sizeof(Elf_Ehdr)) {
error = "fstat() failed or returned a too low file size";
goto symbol_version_error;
}
/* mmap() library */
addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (addr == MAP_FAILED) {
error = "mmap() failed";
goto symbol_version_error;
}
/* ELF header */
Elf_Ehdr *ehdr = addr;
error = "offset exceeding filesize";
if (ehdr->e_shoff > st.st_size) {
goto symbol_version_error;
}
Elf_Shdr *shdr = addr + ehdr->e_shoff;
int shnum = ehdr->e_shnum;
Elf_Shdr *sh_strtab = &shdr[ehdr->e_shstrndx];
if (sh_strtab->sh_offset > st.st_size) {
goto symbol_version_error;
}
const char *sh_strtab_p = addr + sh_strtab->sh_offset;
const char *sh_dynstr_p = sh_strtab_p;
const char * const sh_strtab_p_const = sh_strtab_p;
/* get strtab/dynstr */
for (int i = 0; i < shnum; ++i) {
if (shdr[i].sh_type != SHT_STRTAB) continue;
const char *name = sh_strtab_p_const + shdr[i].sh_name;
if (strcmp(name, ".strtab") == 0) {
if (shdr[i].sh_offset > st.st_size) {
goto symbol_version_error;
}
sh_strtab_p = addr + shdr[i].sh_offset;
break;
} else if (strcmp(name, ".dynstr") == 0) {
if (shdr[i].sh_offset > st.st_size) {
goto symbol_version_error;
}
sh_dynstr_p = addr + shdr[i].sh_offset;
break;
}
}
const char *symbol = NULL;
size_t len = strlen(sym_prefix);
/* iterate through sections */
for (int i = 0; i < shnum; ++i) {
if (shdr[i].sh_type != SHT_SYMTAB && shdr[i].sh_type != SHT_DYNSYM) {
continue;
}
if (shdr[i].sh_offset > st.st_size) {
goto symbol_version_error;
}
Elf_Sym *syms_data = addr + shdr[i].sh_offset;
/* iterate through symbols */
for (size_t j = 0; j < shdr[i].sh_size / sizeof(Elf_Sym); ++j) {
if (syms_data[j].st_shndx != SHN_ABS) {
continue;
}
const char *name;
if (shdr[i].sh_type == SHT_DYNSYM) {
name = sh_dynstr_p + syms_data[j].st_name;
} else {
name = sh_strtab_p + syms_data[j].st_name;
}
if (strncmp(name, sym_prefix, len) != 0) {
continue;
}
if (!symbol) {
symbol = name;
continue;
}
if (strverscmp(name, symbol) > 0) {
symbol = name;
}
}
}
int maj = 0, min = 0, pat = 0;
if (sscanf(symbol + len, "%d.%d.%d", &maj, &min, &pat) < 1) {
goto symbol_version_error;
}
PRINT_VERBOSE("%s%d.%d.%d\n", sym_prefix, maj, min, pat);
munmap(addr, st.st_size);
close(fd);
return (pat + min*1000 + maj*1000000);
symbol_version_error:
PRINT_VERBOSE("error: %s: %s\n", error, orig);
munmap(addr, st.st_size);
close(fd);
return -1;
}
static void dump_file(const char *dest, unsigned char *data, unsigned int len)
{
int fd = creat(dest, DEFFILEMODE);
if (fd == -1) return;
if (write(fd, data, len) != len) unlink(dest);
close(fd);
}
static int copy_lib(const char *lib, const char *destDir, char verbose)
{
char *destFull = NULL;
int fdIn = -1, fdOut = -1;
/* get full source and target paths */
char *srcFull = get_libpath(lib, verbose);
if (!srcFull) goto copy_lib_error;
char *base = basename(srcFull);
if (!base) goto copy_lib_error;
size_t len = strlen(destDir);
size_t len2 = strlen(base);
destFull = malloc(len + MAX(len2,32) + 2);
sprintf(destFull, "%s/%s", destDir, base);
/* open source for reading */
fdIn = open(srcFull, O_RDONLY|O_CLOEXEC);
if (fdIn == -1) goto copy_lib_error;
/* open target for writing */
mkdir(destDir, ACCESSPERMS);
fdOut = creat(destFull, DEFFILEMODE);
if (fdOut == -1) goto copy_lib_error;
/* copy data into target */
ssize_t n;
unsigned char buf[512*1024];
while ((n = read(fdIn, &buf, sizeof(buf))) > 0) {
if (write(fdOut, &buf, n) != n) {
goto copy_lib_error;
}
}
int rv = 0;
fprintf(stderr, ">> %s\ncopied to -> %s\n", srcFull, destFull);
/* dump COPYING files */
char *p = destFull + len + 1;
strcpy(p, "COPYING.RUNTIME.gz");
dump_file(destFull, COPYING_RUNTIME_gz, COPYING_RUNTIME_gz_len);
p += 7;
strcpy(p, "3.gz");
dump_file(destFull, COPYING3_gz, COPYING3_gz_len);
strcpy(p, ".libgcc");
dump_file(destFull, COPYING_libgcc, COPYING_libgcc_len);
strcpy(p, ".libstdc++");
dump_file(destFull, COPYING_libstdc__, COPYING_libstdc___len);
fprintf(stderr, "(COPYING files were added too)\n");
goto copy_lib_end;
copy_lib_error:
rv = -1;
copy_lib_end:
if (fdOut != -1) close(fdOut);
if (fdIn != -1) close(fdIn);
if (srcFull) free(srcFull);
if (destFull) free(destFull);
return rv;
}
int main(int argc, char **argv)
{
#if CHECKRT_TEST == 1
printf("Test:\n\n");
copy_lib(LIBGCC_S_SO, "./" LIBGCC_DIR, 1);
copy_lib(LIBSTDCXX_SO, "./" STDCXX_DIR, 1);
putchar('\n');
symbol_version("./" LIBGCC_DIR "/" LIBGCC_S_SO, "GCC_", 1);
putchar('\n');
symbol_version("./" STDCXX_DIR "/" LIBSTDCXX_SO, "GLIBCXX_", 1);
putchar('\n');
symbol_version(LIBGCC_S_SO, "GCC_", 1);
putchar('\n');
symbol_version(LIBSTDCXX_SO, "GLIBCXX_", 1);
#else
char v = 0, copy = 0;
for (int i=1; i < argc; i++) {
if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
fprintf(stderr,
"usage:\n"
" %s -c|--copy-libraries\n"
" %s -h|--help\n"
" %s -v|--verbose\n"
"\n"
"This program will look for the following libraries relative to its\n"
"location, check if they are usable and add them to LD_LIBRARY_PATH\n"
"if they are newer than the system's equivalent:\n"
"\n"
" " LIBGCC_DIR "/" LIBGCC_S_SO "\n"
" " STDCXX_DIR "/" LIBSTDCXX_SO "\n", argv[0], argv[0], argv[0]);
return 0;
} else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
v = 1;
} else if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--copy-libraries") == 0) {
copy = 1;
} else {
fprintf(stderr, "error: invalid argument: %s\nTry `%s --help' for more information.\n", argv[i], argv[0]);
return 1;
}
}
char *currdir = realpath("/proc/self/exe", NULL);
if (!currdir) {
fprintf(stderr, "error: realpath() failed to resolve /proc/self/exe\n");
return 1;
}
char *p = strrchr(currdir, '/');
if (!p) {
perror("strrchr()");
free(currdir);
return 1;
}
*(p+1) = 0;
size_t len = strlen(currdir);
char *libpath = malloc(len + MAX(sizeof(STDCXX_DIR), sizeof(LIBGCC_DIR)) +
MAX(sizeof(LIBSTDCXX_SO), sizeof(LIBGCC_S_SO)) + 2);
strcpy(libpath, currdir);
p = libpath + len;
if (copy) {
/* copy system libraries */
strcpy(p, LIBGCC_DIR);
copy_lib(LIBGCC_S_SO, libpath, v);
strcpy(p, STDCXX_DIR);
copy_lib(LIBSTDCXX_SO, libpath, v);
} else {
/* get symbol versions */
strcpy(p, LIBGCC_DIR "/" LIBGCC_S_SO);
int ver = symbol_version(libpath, "GCC_", v);
if (ver != -1 && ver > symbol_version(LIBGCC_S_SO, "GCC_", v)) {
printf("%s" LIBGCC_DIR ":", currdir);
}
strcpy(p, STDCXX_DIR "/" LIBSTDCXX_SO);
ver = symbol_version(libpath, "GLIBCXX_", v);
if (ver != -1 && ver > symbol_version(LIBSTDCXX_SO, "GLIBCXX_", v)) {
printf("%s" STDCXX_DIR ":", currdir);
}
putchar('\n');
}
free(libpath);
free(currdir);
#endif
return 0;
}

15
src/patch_libs.sh
View file

@ -1,15 +0,0 @@
#!/bin/sh
mv gcc/libgcc_s.so.1 gcc/libgcc_s.so.1.bak
sed -e 's|GCC_[0-9]\.[0-9]|GCC_9.9|g' \
-e 's|GCC_[0-9]\.[0-9]\.[0-9]|GCC_9.9.9|g' \
-e 's|GCC_[0-9][0-9]\.[0-9]\.[0-9]|GCC_99.9.9|g' \
gcc/libgcc_s.so.1.bak > gcc/libgcc_s.so.1
mv cxx/libstdc++.so.6 cxx/libstdc++.so.6.bak
sed -e 's|GLIBCXX_[0-9]\.[0-9]|GLIBCXX_9.9|g' \
-e 's|GLIBCXX_[0-9]\.[0-9]\.[0-9]|GLIBCXX_9.9.9|g' \
-e 's|GLIBCXX_[0-9]\.[0-9]\.[0-9][0-9]|GLIBCXX_9.9.99|g' \
cxx/libstdc++.so.6.bak > cxx/libstdc++.so.6