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llvmPackages_*: respect cc for target when choosing C++ flavour

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llvmPackages_*.clang should check the default compiler for the package
set it is targeting (targetPackages.stdenv.cc) instead of the compiler
that has been used to build it (stdenv.cc) in order to get some sense of
whether to use libc++ or libstdc++.

Since we are now inspecting targetPackages in the llvmPackages.clang
attribute, we need to avoid using it in the cross stdenv — which just
forces us to explicitly request libcxxClang for darwin instead of
relying on the clang attribute to pick it for us.

We also need to do something similar for targetPackages.stdenv.cc: Here
the llvmPackages.clang logic would work as we want (inspect
targetPackages.stdenv.cc and if it doesn't exist, make the choice based
on stdenv.cc), but it gets locked in a cycle with the previous package.
We can easily break this, however: We know that the previous set had
clang and the next one doesn't exist, so we'd choose libcxxClang any day
of the week.
This commit is contained in:
sternenseemann 2022-01-07 02:30:01 +01:00
parent 17c5a15c89
commit 766f5ffb76
12 changed files with 58 additions and 12 deletions
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6
pkgs/development/compilers/llvm/10/default.nix
View file

@ -89,7 +89,11 @@ let
# python3 = pkgs.python3; # don't use python-boot
# });
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/11/default.nix
View file

@ -104,7 +104,11 @@ let
# python3 = pkgs.python3; # don't use python-boot
# });
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/12/default.nix
View file

@ -92,7 +92,11 @@ let
# python3 = pkgs.python3; # don't use python-boot
# });
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/13/default.nix
View file

@ -93,7 +93,11 @@ let
# python3 = pkgs.python3; # don't use python-boot
# });
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/5/default.nix
View file

@ -65,7 +65,11 @@ let
python3 = pkgs.python3; # don't use python-boot
});
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/6/default.nix
View file

@ -66,7 +66,11 @@ let
python3 = pkgs.python3; # don't use python-boot
});
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/7/default.nix
View file

@ -96,7 +96,11 @@ let
python3 = pkgs.python3; # don't use python-boot
});
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/8/default.nix
View file

@ -97,7 +97,11 @@ let
python3 = pkgs.python3; # don't use python-boot
});
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/9/default.nix
View file

@ -97,7 +97,11 @@ let
python3 = pkgs.python3; # don't use python-boot
});
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

6
pkgs/development/compilers/llvm/git/default.nix
View file

@ -93,7 +93,11 @@ let
# python3 = pkgs.python3; # don't use python-boot
# });
clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
# pick clang appropriate for package set we are targeting
clang =
if (pkgs.targetPackages.stdenv or stdenv).cc.isGNU
then tools.libstdcxxClang
else tools.libcxxClang;
libstdcxxClang = wrapCCWith rec {
cc = tools.clang-unwrapped;

8
pkgs/stdenv/booter.nix
View file

@ -124,7 +124,13 @@ stageFuns: let
if buildPackages.stdenv.hasCC
then
if buildPackages.stdenv.cc.isClang or false
then buildPackages.clang
# buildPackages.clang checks targetPackages.stdenv.cc (i. e. this
# attribute) to get a sense of the its set's default compiler and
# chooses between libc++ and libstdc++ based on that. If we hit this
# code here, we'll cause an infinite recursion. Since a set with
# clang as its default compiler always means libc++, we can infer this
# decision statically.
then buildPackages.llvmPackages.libcxxClang
else buildPackages.gcc
else
# This will blow up if anything uses it, but that's OK. The `if

2
pkgs/stdenv/cross/default.nix
View file

@ -70,7 +70,7 @@ in lib.init bootStages ++ [
# when there is a C compiler and everything should be fine.
then throw "no C compiler provided for this platform"
else if crossSystem.isDarwin
then buildPackages.llvmPackages.clang
then buildPackages.llvmPackages.libcxxClang
else if crossSystem.useLLVM or false
then buildPackages.llvmPackages.clangUseLLVM
else buildPackages.gcc;