forked from mirrors/nixpkgs
b2c7a5a271
02c09e0171(NixOS/nixpkgs#44558) was reverted inc981787db9but, as it turns out, it fixed an issue I didn't know about at the time: the values of `propagateDoc` options were (and now again are) inconsistent with the underlying things those wrappers wrap (see NixOS/nixpkgs#46119), which was (and now is) likely to produce more instances of NixOS/nixpkgs#43547, if not now, then eventually as stdenv changes. This patch (which is a simplified version of the original reverted patch) is the simplest solution to this whole thing: it forces wrappers to directly inspect the outputs of the things they are wrapping instead of making stdenv guess the correct values.
312 lines
11 KiB
Nix
312 lines
11 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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, stdenvNoCC
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, cc ? null, libc ? null, bintools, coreutils ? null, shell ? stdenvNoCC.shell
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, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, propagateDoc ? cc != null && cc ? man
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, extraPackages ? [], extraBuildCommands ? ""
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, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
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, buildPackages ? {}
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}:
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with stdenvNoCC.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 = stdenv.lib.optionalString (targetPlatform != hostPlatform)
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(targetPlatform.config + "-");
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ccVersion = (builtins.parseDrvName cc.name).version;
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ccName = (builtins.parseDrvName cc.name).name;
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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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# 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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default_cxx_stdlib_compile = optionalString (targetPlatform.isLinux && !(cc.isGNU or false) && !nativeTools && cc ? gcc)
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"-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)";
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# The "infix salt" is a arbitrary string added in the middle 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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infixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config;
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expand-response-params =
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if buildPackages.stdenv.cc or null != null && 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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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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name = targetPrefix
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+ (if name != "" then name else stdenv.lib.removePrefix targetPrefix "${ccName}-wrapper")
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+ (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
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preferLocalBuild = true;
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inherit cc libc_bin libc_dev libc_lib bintools coreutils_bin;
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shell = getBin shell + shell.shellPath or "";
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gnugrep_bin = if nativeTools then "" else gnugrep;
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inherit targetPrefix infixSalt;
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outputs = [ "out" ] ++ optionals propagateDoc [ "man" "info" ];
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passthru = {
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# "cc" is the generic name for a C compiler, but there is no one for package
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# providing the linker and related tools. The two we use now are GNU
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# Binutils, and Apple's "cctools"; "bintools" as an attempt to find an
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# unused middle-ground name that evokes both.
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inherit bintools;
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inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc
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(lambda (arg)
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(when (file-directory-p (concat arg "/include"))
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(setenv "NIX_${infixSalt}_CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt}_CFLAGS_COMPILE") " -isystem " arg "/include"))))
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'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
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'';
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};
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dontBuild = true;
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dontConfigure = true;
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unpackPhase = ''
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src=$PWD
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'';
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installPhase =
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''
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set -u
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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="$3"
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substituteAll "$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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+ ''
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# Create symlinks to everything in the bintools wrapper.
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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 $bbin)"
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done
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# We export environment variables pointing to the wrapped nonstandard
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# cmds, lest some lousy configure script use those to guess compiler
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# version.
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export named_cc=${targetPrefix}cc
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export named_cxx=${targetPrefix}c++
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export default_cxx_stdlib_compile="${default_cxx_stdlib_compile}"
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if [ -e $ccPath/${targetPrefix}gcc ]; then
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wrap ${targetPrefix}gcc ${./cc-wrapper.sh} $ccPath/${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 ${./cc-wrapper.sh} $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++ ${./cc-wrapper.sh} $ccPath/${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++ ${./cc-wrapper.sh} $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 ${./cc-wrapper.sh} $ccPath/cpp
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fi
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''
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+ optionalString cc.langFortran or false ''
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wrap ${targetPrefix}gfortran ${./cc-wrapper.sh} $ccPath/${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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''
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+ optionalString cc.langJava or false ''
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wrap ${targetPrefix}gcj ${./cc-wrapper.sh} $ccPath/${targetPrefix}gcj
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''
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+ optionalString cc.langGo or false ''
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wrap ${targetPrefix}gccgo ${./cc-wrapper.sh} $ccPath/${targetPrefix}gccgo
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'';
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strictDeps = true;
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propagatedBuildInputs = [ bintools ];
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depsTargetTargetPropagated = 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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./setup-hook.sh
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];
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postFixup =
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''
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set -u
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# Backwards compatability for packages expecting this file, e.g. with
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# `$NIX_CC/nix-support/dynamic-linker`.
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#
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# TODO(@Ericson2314): Remove this after stable release and force
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# everyone to refer to bintools-wrapper directly.
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if [[ -f "$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" "$out/nix-support"
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fi
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''
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+ optionalString (libc != null) ''
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##
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## General libc support
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##
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# The "-B${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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echo "-B${libc_lib}/lib/ -idirafter ${libc_dev}/include ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
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echo "${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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+ optionalString (!nativeTools) ''
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##
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## Initial CFLAGS
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##
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# GCC shows ${cc_solib}/lib in `gcc -print-search-dirs', but not
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# ${cc_solib}/lib64 (even though it does actually search there...)..
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# This confuses libtool. So add it to the compiler tool search
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# path explicitly.
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if [ -e "${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${cc_solib}/lib"
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echo "$ccLDFlags" > $out/nix-support/cc-ldflags
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echo "$ccCFlags" > $out/nix-support/cc-cflags
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''
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+ optionalString propagateDoc ''
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##
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## Man page and info support
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##
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mkdir -p $man/nix-support $info/nix-support
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printWords ${cc.man or ""} > $man/nix-support/propagated-user-env-packages
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printWords ${cc.info or ""} > $info/nix-support/propagated-user-env-packages
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''
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+ ''
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##
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## Hardening support
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##
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export hardening_unsupported_flags="${builtins.concatStringsSep " " (cc.hardeningUnsupportedFlags or [])}"
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''
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+ optionalString hostPlatform.isCygwin ''
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hardening_unsupported_flags+=" pic"
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''
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+ optionalString targetPlatform.isMinGW ''
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hardening_unsupported_flags+=" stackprotector"
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''
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+ ''
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substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
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substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
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substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
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##
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## Extra custom steps
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##
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''
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+ extraBuildCommands;
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inherit expand-response-params;
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# for substitution in utils.bash
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expandResponseParams = "${expand-response-params}/bin/expand-response-params";
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meta =
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let cc_ = if cc != null then cc else {}; in
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(if cc_ ? meta then removeAttrs cc.meta ["priority"] else {}) //
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{ description =
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stdenv.lib.attrByPath ["meta" "description"] "System C compiler" cc_
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+ " (wrapper script)";
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};
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}
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