546 lines
21 KiB
Nix
546 lines
21 KiB
Nix
# The Nixpkgs CC is not directly usable, since it doesn't know where
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# the C library and standard header files are. Therefore the compiler
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# produced by that package cannot be installed directly in a user
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# environment and used from the command line. So we use a wrapper
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# script that sets up the right environment variables so that the
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# compiler and the linker just "work".
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{ name ? ""
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, lib
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, stdenvNoCC
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, cc ? null, libc ? null, bintools, coreutils ? null, shell ? stdenvNoCC.shell
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, gccForLibs ? null
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, zlib ? null
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, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, propagateDoc ? cc != null && cc ? man
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, extraTools ? [], extraPackages ? [], extraBuildCommands ? ""
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, nixSupport ? {}
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, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
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, buildPackages ? {}
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, libcxx ? null
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}:
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with lib;
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assert nativeTools -> !propagateDoc && nativePrefix != "";
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assert !nativeTools ->
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cc != null && coreutils != null && gnugrep != null;
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assert !(nativeLibc && noLibc);
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assert (noLibc || nativeLibc) == (libc == null);
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let
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stdenv = stdenvNoCC;
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inherit (stdenv) hostPlatform targetPlatform;
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# Prefix for binaries. Customarily ends with a dash separator.
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#
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# TODO(@Ericson2314) Make unconditional, or optional but always true by
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# default.
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targetPrefix = lib.optionalString (targetPlatform != hostPlatform)
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(targetPlatform.config + "-");
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ccVersion = lib.getVersion cc;
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ccName = lib.removePrefix targetPrefix (lib.getName cc);
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libc_bin = if libc == null then null else getBin libc;
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libc_dev = if libc == null then null else getDev libc;
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libc_lib = if libc == null then null else getLib libc;
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cc_solib = getLib cc
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+ optionalString (targetPlatform != hostPlatform) "/${targetPlatform.config}";
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# The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
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coreutils_bin = if nativeTools then "" else getBin coreutils;
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# The "suffix salt" is a arbitrary string added in the end of env vars
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# defined by cc-wrapper's hooks so that multiple cc-wrappers can be used
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# without interfering. For the moment, it is defined as the target triple,
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# adjusted to be a valid bash identifier. This should be considered an
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# unstable implementation detail, however.
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suffixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config;
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expand-response-params =
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if (buildPackages.stdenv.hasCC or false) && buildPackages.stdenv.cc != "/dev/null"
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then import ../expand-response-params { inherit (buildPackages) stdenv; }
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else "";
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useGccForLibs = isClang
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&& libcxx == null
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&& !stdenv.targetPlatform.isDarwin
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&& !(stdenv.targetPlatform.useLLVM or false)
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&& !(stdenv.targetPlatform.useAndroidPrebuilt or false)
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&& !(stdenv.targetPlatform.isiOS or false)
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&& gccForLibs != null;
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# older compilers (for example bootstrap's GCC 5) fail with -march=too-modern-cpu
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isGccArchSupported = arch:
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if isGNU then
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{ # Intel
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skylake = versionAtLeast ccVersion "6.0";
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skylake-avx512 = versionAtLeast ccVersion "6.0";
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cannonlake = versionAtLeast ccVersion "8.0";
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icelake-client = versionAtLeast ccVersion "8.0";
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icelake-server = versionAtLeast ccVersion "8.0";
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cascadelake = versionAtLeast ccVersion "9.0";
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cooperlake = versionAtLeast ccVersion "10.0";
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tigerlake = versionAtLeast ccVersion "10.0";
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knm = versionAtLeast ccVersion "8.0";
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# AMD
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znver1 = versionAtLeast ccVersion "6.0";
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znver2 = versionAtLeast ccVersion "9.0";
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znver3 = versionAtLeast ccVersion "11.0";
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}.${arch} or true
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else if isClang then
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{ # Intel
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cannonlake = versionAtLeast ccVersion "5.0";
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icelake-client = versionAtLeast ccVersion "7.0";
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icelake-server = versionAtLeast ccVersion "7.0";
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knm = versionAtLeast ccVersion "7.0";
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# AMD
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znver1 = versionAtLeast ccVersion "4.0";
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znver2 = versionAtLeast ccVersion "9.0";
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}.${arch} or true
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else
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false;
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darwinPlatformForCC = optionalString stdenv.targetPlatform.isDarwin (
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if (targetPlatform.darwinPlatform == "macos" && isGNU) then "macosx"
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else targetPlatform.darwinPlatform
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);
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darwinMinVersion = optionalString stdenv.targetPlatform.isDarwin (
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stdenv.targetPlatform.darwinMinVersion
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);
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darwinMinVersionVariable = optionalString stdenv.targetPlatform.isDarwin
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stdenv.targetPlatform.darwinMinVersionVariable;
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in
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# Ensure bintools matches
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assert libc_bin == bintools.libc_bin;
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assert libc_dev == bintools.libc_dev;
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assert libc_lib == bintools.libc_lib;
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assert nativeTools == bintools.nativeTools;
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assert nativeLibc == bintools.nativeLibc;
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assert nativePrefix == bintools.nativePrefix;
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stdenv.mkDerivation {
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pname = targetPrefix
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+ (if name != "" then name else "${ccName}-wrapper");
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version = if cc == null then null else ccVersion;
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preferLocalBuild = true;
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inherit cc libc_bin libc_dev libc_lib bintools coreutils_bin;
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shell = getBin shell + shell.shellPath or "";
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gnugrep_bin = if nativeTools then "" else gnugrep;
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inherit targetPrefix suffixSalt;
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inherit darwinPlatformForCC darwinMinVersion darwinMinVersionVariable;
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outputs = [ "out" ] ++ optionals propagateDoc [ "man" "info" ];
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passthru = {
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# "cc" is the generic name for a C compiler, but there is no one for package
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# providing the linker and related tools. The two we use now are GNU
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# Binutils, and Apple's "cctools"; "bintools" as an attempt to find an
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# unused middle-ground name that evokes both.
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inherit bintools;
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inherit libc nativeTools nativeLibc nativePrefix isGNU isClang;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc
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(lambda (arg)
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(when (file-directory-p (concat arg "/include"))
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(setenv "NIX_CFLAGS_COMPILE_${suffixSalt}" (concat (getenv "NIX_CFLAGS_COMPILE_${suffixSalt}") " -isystem " arg "/include"))))
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'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
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'';
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inherit nixSupport;
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};
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dontBuild = true;
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dontConfigure = true;
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unpackPhase = ''
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src=$PWD
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'';
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wrapper = ./cc-wrapper.sh;
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installPhase =
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''
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mkdir -p $out/bin $out/nix-support
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wrap() {
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local dst="$1"
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local wrapper="$2"
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export prog="$3"
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export use_response_file_by_default=${if isClang then "1" else "0"}
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substituteAll "$wrapper" "$out/bin/$dst"
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chmod +x "$out/bin/$dst"
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}
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''
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+ (if nativeTools then ''
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echo ${if targetPlatform.isDarwin then cc else nativePrefix} > $out/nix-support/orig-cc
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ccPath="${if targetPlatform.isDarwin then cc else nativePrefix}/bin"
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'' else ''
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echo $cc > $out/nix-support/orig-cc
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ccPath="${cc}/bin"
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'')
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# Create symlinks to everything in the bintools wrapper.
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+ ''
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for bbin in $bintools/bin/*; do
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mkdir -p "$out/bin"
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ln -s "$bbin" "$out/bin/$(basename $bbin)"
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done
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''
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# We export environment variables pointing to the wrapped nonstandard
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# cmds, lest some lousy configure script use those to guess compiler
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# version.
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+ ''
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export named_cc=${targetPrefix}cc
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export named_cxx=${targetPrefix}c++
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if [ -e $ccPath/${targetPrefix}gcc ]; then
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wrap ${targetPrefix}gcc $wrapper $ccPath/${targetPrefix}gcc
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ln -s ${targetPrefix}gcc $out/bin/${targetPrefix}cc
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export named_cc=${targetPrefix}gcc
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export named_cxx=${targetPrefix}g++
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elif [ -e $ccPath/clang ]; then
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wrap ${targetPrefix}clang $wrapper $ccPath/clang
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ln -s ${targetPrefix}clang $out/bin/${targetPrefix}cc
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export named_cc=${targetPrefix}clang
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export named_cxx=${targetPrefix}clang++
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fi
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if [ -e $ccPath/${targetPrefix}g++ ]; then
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wrap ${targetPrefix}g++ $wrapper $ccPath/${targetPrefix}g++
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ln -s ${targetPrefix}g++ $out/bin/${targetPrefix}c++
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elif [ -e $ccPath/clang++ ]; then
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wrap ${targetPrefix}clang++ $wrapper $ccPath/clang++
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ln -s ${targetPrefix}clang++ $out/bin/${targetPrefix}c++
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fi
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if [ -e $ccPath/cpp ]; then
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wrap ${targetPrefix}cpp $wrapper $ccPath/cpp
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fi
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''
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+ optionalString cc.langAda or false ''
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wrap ${targetPrefix}gnatmake ${./gnat-wrapper.sh} $ccPath/${targetPrefix}gnatmake
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wrap ${targetPrefix}gnatbind ${./gnat-wrapper.sh} $ccPath/${targetPrefix}gnatbind
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wrap ${targetPrefix}gnatlink ${./gnat-wrapper.sh} $ccPath/${targetPrefix}gnatlink
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# this symlink points to the unwrapped gnat's output "out". It is used by
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# our custom gprconfig compiler description to find GNAT's ada runtime. See
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# ../../development/tools/build-managers/gprbuild/{boot.nix, nixpkgs-gnat.xml}
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ln -sf ${cc} $out/nix-support/gprconfig-gnat-unwrapped
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''
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+ optionalString cc.langD or false ''
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wrap ${targetPrefix}gdc $wrapper $ccPath/${targetPrefix}gdc
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''
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+ optionalString cc.langFortran or false ''
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wrap ${targetPrefix}gfortran $wrapper $ccPath/${targetPrefix}gfortran
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ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}g77
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ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}f77
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export named_fc=${targetPrefix}gfortran
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''
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+ optionalString cc.langJava or false ''
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wrap ${targetPrefix}gcj $wrapper $ccPath/${targetPrefix}gcj
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''
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+ optionalString cc.langGo or false ''
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wrap ${targetPrefix}gccgo $wrapper $ccPath/${targetPrefix}gccgo
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'';
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strictDeps = true;
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propagatedBuildInputs = [ bintools ] ++ extraTools ++ optionals cc.langD or false [ zlib ];
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depsTargetTargetPropagated = optional (libcxx != null) libcxx ++ extraPackages;
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wrapperName = "CC_WRAPPER";
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setupHooks = [
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../setup-hooks/role.bash
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] ++ lib.optional (cc.langC or true) ./setup-hook.sh
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++ lib.optional (cc.langFortran or false) ./fortran-hook.sh;
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postFixup =
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# Ensure flags files exists, as some other programs cat them. (That these
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# are considered an exposed interface is a bit dubious, but fine for now.)
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''
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touch "$out/nix-support/cc-cflags"
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touch "$out/nix-support/cc-ldflags"
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''
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# Backwards compatability for packages expecting this file, e.g. with
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# `$NIX_CC/nix-support/dynamic-linker`.
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#
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# TODO(@Ericson2314): Remove this after stable release and force
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# everyone to refer to bintools-wrapper directly.
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+ ''
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if [[ -f "$bintools/nix-support/dynamic-linker" ]]; then
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ln -s "$bintools/nix-support/dynamic-linker" "$out/nix-support"
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fi
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if [[ -f "$bintools/nix-support/dynamic-linker-m32" ]]; then
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ln -s "$bintools/nix-support/dynamic-linker-m32" "$out/nix-support"
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fi
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''
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##
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## General Clang support
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##
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+ optionalString isClang ''
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echo "-target ${targetPlatform.config}" >> $out/nix-support/cc-cflags
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''
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##
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## GCC libs for non-GCC support
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##
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+ optionalString useGccForLibs ''
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echo "-B${gccForLibs}/lib/gcc/${targetPlatform.config}/${gccForLibs.version}" >> $out/nix-support/cc-cflags
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echo "-L${gccForLibs}/lib/gcc/${targetPlatform.config}/${gccForLibs.version}" >> $out/nix-support/cc-ldflags
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echo "-L${gccForLibs.lib}/${targetPlatform.config}/lib" >> $out/nix-support/cc-ldflags
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''
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# TODO We would like to connect this to `useGccForLibs`, but we cannot yet
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# because `libcxxStdenv` on linux still needs this. Maybe someday we'll
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# always set `useLLVM` on Darwin, and maybe also break down `useLLVM` into
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# fine-grained use flags (libgcc vs compiler-rt, ld.lld vs legacy, libc++
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# vs libstdc++, etc.) since Darwin isn't `useLLVM` on all counts. (See
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# https://clang.llvm.org/docs/Toolchain.html for all the axes one might
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# break `useLLVM` into.)
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+ optionalString (isClang
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&& targetPlatform.isLinux
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&& !(stdenv.targetPlatform.useAndroidPrebuilt or false)
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&& !(stdenv.targetPlatform.useLLVM or false)
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&& gccForLibs != null) ''
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echo "--gcc-toolchain=${gccForLibs}" >> $out/nix-support/cc-cflags
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''
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##
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## General libc support
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##
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# The "-B${libc_lib}/lib/" flag is a quick hack to force gcc to link
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# against the crt1.o from our own glibc, rather than the one in
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# /usr/lib. (This is only an issue when using an `impure'
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# compiler/linker, i.e., one that searches /usr/lib and so on.)
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#
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# Unfortunately, setting -B appears to override the default search
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# path. Thus, the gcc-specific "../includes-fixed" directory is
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# now longer searched and glibc's <limits.h> header fails to
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# compile, because it uses "#include_next <limits.h>" to find the
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# limits.h file in ../includes-fixed. To remedy the problem,
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# another -idirafter is necessary to add that directory again.
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+ optionalString (libc != null) (''
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touch "$out/nix-support/libc-cflags"
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touch "$out/nix-support/libc-ldflags"
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echo "-B${libc_lib}${libc.libdir or "/lib/"}" >> $out/nix-support/libc-crt1-cflags
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'' + optionalString (!(cc.langD or false)) ''
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echo "-idirafter ${libc_dev}${libc.incdir or "/include"}" >> $out/nix-support/libc-cflags
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'' + optionalString (isGNU && (!(cc.langD or false))) ''
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for dir in "${cc}"/lib/gcc/*/*/include-fixed; do
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echo '-idirafter' ''${dir} >> $out/nix-support/libc-cflags
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done
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'' + ''
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echo "${libc_lib}" > $out/nix-support/orig-libc
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echo "${libc_dev}" > $out/nix-support/orig-libc-dev
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'')
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##
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## General libc++ support
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##
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# We have a libc++ directly, we have one via "smuggled" GCC, or we have one
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# bundled with the C compiler because it is GCC
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+ optionalString (libcxx != null || (useGccForLibs && gccForLibs.langCC or false) || (isGNU && cc.langCC or false)) ''
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touch "$out/nix-support/libcxx-cxxflags"
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touch "$out/nix-support/libcxx-ldflags"
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''
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+ optionalString (libcxx == null && (useGccForLibs && gccForLibs.langCC or false)) ''
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for dir in ${gccForLibs}/include/c++/*; do
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echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags
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done
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for dir in ${gccForLibs}/include/c++/*/${targetPlatform.config}; do
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echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags
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done
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''
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+ optionalString (libcxx.isLLVM or false) (''
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echo "-isystem ${lib.getDev libcxx}/include/c++/v1" >> $out/nix-support/libcxx-cxxflags
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echo "-stdlib=libc++" >> $out/nix-support/libcxx-ldflags
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'' + lib.optionalString stdenv.targetPlatform.isLinux ''
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echo "-lc++abi" >> $out/nix-support/libcxx-ldflags
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'')
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|
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##
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## Initial CFLAGS
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##
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||
|
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# GCC shows ${cc_solib}/lib in `gcc -print-search-dirs', but not
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# ${cc_solib}/lib64 (even though it does actually search there...)..
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# This confuses libtool. So add it to the compiler tool search
|
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# path explicitly.
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+ optionalString (!nativeTools) ''
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if [ -e "${cc_solib}/lib64" -a ! -L "${cc_solib}/lib64" ]; then
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ccLDFlags+=" -L${cc_solib}/lib64"
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ccCFlags+=" -B${cc_solib}/lib64"
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fi
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ccLDFlags+=" -L${cc_solib}/lib"
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ccCFlags+=" -B${cc_solib}/lib"
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|
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'' + optionalString cc.langAda or false ''
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touch "$out/nix-support/gnat-cflags"
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touch "$out/nix-support/gnat-ldflags"
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basePath=$(echo $cc/lib/*/*/*)
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ccCFlags+=" -B$basePath -I$basePath/adainclude"
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gnatCFlags="-I$basePath/adainclude -I$basePath/adalib"
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|
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echo "$gnatCFlags" >> $out/nix-support/gnat-cflags
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'' + ''
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echo "$ccLDFlags" >> $out/nix-support/cc-ldflags
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echo "$ccCFlags" >> $out/nix-support/cc-cflags
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'' + optionalString (targetPlatform.isDarwin && (libcxx != null) && (cc.isClang or false)) ''
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echo " -L${lib.getLib libcxx}/lib" >> $out/nix-support/cc-ldflags
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''
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##
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## Man page and info support
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##
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+ optionalString propagateDoc ''
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ln -s ${cc.man} $man
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ln -s ${cc.info} $info
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'' + optionalString (cc.langD or false) ''
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echo "-B${zlib}${zlib.libdir or "/lib/"}" >> $out/nix-support/libc-cflags
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''
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|
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##
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## Hardening support
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##
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+ ''
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export hardening_unsupported_flags="${builtins.concatStringsSep " " (cc.hardeningUnsupportedFlags or [])}"
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''
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|
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# Machine flags. These are necessary to support
|
||
|
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# TODO: We should make a way to support miscellaneous machine
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||
# flags and other gcc flags as well.
|
||
|
||
# Always add -march based on cpu in triple. Sometimes there is a
|
||
# discrepency (x86_64 vs. x86-64), so we provide an "arch" arg in
|
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# that case.
|
||
# TODO: aarch64-darwin has mcpu incompatible with gcc
|
||
+ optionalString ((targetPlatform ? gcc.arch) && (isClang || !(stdenv.isDarwin && stdenv.isAarch64)) &&
|
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isGccArchSupported targetPlatform.gcc.arch) ''
|
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echo "-march=${targetPlatform.gcc.arch}" >> $out/nix-support/cc-cflags-before
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''
|
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|
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# -mcpu is not very useful. You should use mtune and march
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# instead. It’s provided here for backwards compatibility.
|
||
# TODO: aarch64-darwin has mcpu incompatible with gcc
|
||
+ optionalString ((targetPlatform ? gcc.cpu) && (isClang || !(stdenv.isDarwin && stdenv.isAarch64))) ''
|
||
echo "-mcpu=${targetPlatform.gcc.cpu}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
|
||
# -mfloat-abi only matters on arm32 but we set it here
|
||
# unconditionally just in case. If the abi specifically sets hard
|
||
# vs. soft floats we use it here.
|
||
+ optionalString (targetPlatform ? gcc.float-abi) ''
|
||
echo "-mfloat-abi=${targetPlatform.gcc.float-abi}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
+ optionalString (targetPlatform ? gcc.fpu) ''
|
||
echo "-mfpu=${targetPlatform.gcc.fpu}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
+ optionalString (targetPlatform ? gcc.mode) ''
|
||
echo "-mmode=${targetPlatform.gcc.mode}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
+ optionalString (targetPlatform ? gcc.thumb) ''
|
||
echo "-m${if targetPlatform.gcc.thumb then "thumb" else "arm"}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
+ optionalString (targetPlatform ? gcc.tune &&
|
||
isGccArchSupported targetPlatform.gcc.tune) ''
|
||
echo "-mtune=${targetPlatform.gcc.tune}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
|
||
# TODO: categorize these and figure out a better place for them
|
||
+ optionalString hostPlatform.isCygwin ''
|
||
hardening_unsupported_flags+=" pic"
|
||
'' + optionalString targetPlatform.isMinGW ''
|
||
hardening_unsupported_flags+=" stackprotector fortify"
|
||
'' + optionalString targetPlatform.isAvr ''
|
||
hardening_unsupported_flags+=" stackprotector pic"
|
||
'' + optionalString (targetPlatform.libc == "newlib") ''
|
||
hardening_unsupported_flags+=" stackprotector fortify pie pic"
|
||
'' + optionalString (targetPlatform.libc == "musl" && targetPlatform.isx86_32) ''
|
||
hardening_unsupported_flags+=" stackprotector"
|
||
'' + optionalString targetPlatform.isNetBSD ''
|
||
hardening_unsupported_flags+=" stackprotector fortify"
|
||
'' + optionalString cc.langAda or false ''
|
||
hardening_unsupported_flags+=" format stackprotector strictoverflow"
|
||
'' + optionalString cc.langD or false ''
|
||
hardening_unsupported_flags+=" format"
|
||
'' + optionalString targetPlatform.isWasm ''
|
||
hardening_unsupported_flags+=" stackprotector fortify pie pic"
|
||
''
|
||
|
||
+ optionalString (libc != null && targetPlatform.isAvr) ''
|
||
for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
|
||
echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-crt1-cflags
|
||
done
|
||
''
|
||
|
||
+ optionalString stdenv.targetPlatform.isDarwin ''
|
||
echo "-arch ${targetPlatform.darwinArch}" >> $out/nix-support/cc-cflags
|
||
''
|
||
|
||
+ optionalString targetPlatform.isAndroid ''
|
||
echo "-D__ANDROID_API__=${targetPlatform.sdkVer}" >> $out/nix-support/cc-cflags
|
||
''
|
||
|
||
# There are a few tools (to name one libstdcxx5) which do not work
|
||
# well with multi line flags, so make the flags single line again
|
||
+ ''
|
||
for flags in "$out/nix-support"/*flags*; do
|
||
substituteInPlace "$flags" --replace $'\n' ' '
|
||
done
|
||
|
||
substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
|
||
substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
|
||
substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
|
||
''
|
||
|
||
##
|
||
## Extra custom steps
|
||
##
|
||
+ extraBuildCommands
|
||
+ lib.strings.concatStringsSep "; "
|
||
(lib.attrsets.mapAttrsToList
|
||
(name: value: "echo ${toString value} >> $out/nix-support/${name}")
|
||
nixSupport);
|
||
|
||
inherit expand-response-params;
|
||
|
||
# for substitution in utils.bash
|
||
expandResponseParams = "${expand-response-params}/bin/expand-response-params";
|
||
|
||
meta =
|
||
let cc_ = if cc != null then cc else {}; in
|
||
(if cc_ ? meta then removeAttrs cc.meta ["priority"] else {}) //
|
||
{ description =
|
||
lib.attrByPath ["meta" "description"] "System C compiler" cc_
|
||
+ " (wrapper script)";
|
||
priority = 10;
|
||
};
|
||
}
|