23c520d95e
We want to make sure this value is explicitly set. Infering it for every arch leads to annoying failures like: https://hydra.nixos.org/build/92583832/ Perhaps we can enable it in the future with some smarter handling of cc-wrapper.sh.
386 lines
14 KiB
Nix
386 lines
14 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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, libcxx ? null
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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 = if (targetPlatform.isLinux && !(cc.isGNU or false) && !nativeTools && cc ? gcc) && !(targetPlatform.useLLVM or false) then
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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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else if targetPlatform.isDarwin && (libcxx != null) && (cc.isClang or false) && !(targetPlatform.useLLVM or false) then
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"-isystem ${libcxx}/include/c++/v1"
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else "";
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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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# 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 cc.isGNU or false then
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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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knm = versionAtLeast ccVersion "8.0";
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}.${arch} or true
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else if cc.isClang or false then
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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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}.${arch} or true
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else
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false;
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in
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# Ensure bintools matches
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assert libc_bin == bintools.libc_bin;
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assert libc_dev == bintools.libc_dev;
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assert libc_lib == bintools.libc_lib;
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assert nativeTools == bintools.nativeTools;
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assert nativeLibc == bintools.nativeLibc;
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assert nativePrefix == bintools.nativePrefix;
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stdenv.mkDerivation {
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name = targetPrefix
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+ (if name != "" then name else stdenv.lib.removePrefix targetPrefix "${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${libc_lib}${libc.libdir or "/lib/"} -idirafter ${libc_dev}${libc.incdir or "/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" > $out/nix-support/cc-cflags
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'' + optionalString (targetPlatform.isDarwin && (libcxx != null) && (cc.isClang or false)) ''
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echo " -L${libcxx}/lib" >> $out/nix-support/cc-ldflags
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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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ln -s ${cc.man} $man
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ln -s ${cc.info} $info
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''
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+ ''
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##
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## Hardening support
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##
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export hardening_unsupported_flags="${builtins.concatStringsSep " " (cc.hardeningUnsupportedFlags or [])}"
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''
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# 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.
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# Always add -march based on cpu in triple. Sometimes there is a
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# discrepency (x86_64 vs. x86-64), so we provide an "arch" arg in
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# that case.
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+ optionalString ((targetPlatform ? platform.gcc.arch) &&
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isGccArchSupported targetPlatform.platform.gcc.arch) ''
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echo "-march=${targetPlatform.platform.gcc.arch}" >> $out/nix-support/cc-cflags-before
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''
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# -mcpu is not very useful. You should use mtune and march
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# instead. It’s provided here for backwards compatibility.
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+ optionalString (targetPlatform ? platform.gcc.cpu) ''
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echo "-mcpu=${targetPlatform.platform.gcc.cpu}" >> $out/nix-support/cc-cflags-before
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''
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# -mfloat-abi only matters on arm32 but we set it here
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# unconditionally just in case. If the abi specifically sets hard
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# vs. soft floats we use it here.
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+ optionalString (targetPlatform ? platform.gcc.float-abi) ''
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echo "-mfloat-abi=${targetPlatform.platform.gcc.float-abi}" >> $out/nix-support/cc-cflags-before
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''
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+ optionalString (targetPlatform ? platform.gcc.fpu) ''
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echo "-mfpu=${targetPlatform.platform.gcc.fpu}" >> $out/nix-support/cc-cflags-before
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''
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+ optionalString (targetPlatform ? platform.gcc.mode) ''
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echo "-mmode=${targetPlatform.platform.gcc.mode}" >> $out/nix-support/cc-cflags-before
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''
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+ optionalString (targetPlatform ? platform.gcc.tune &&
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isGccArchSupported targetPlatform.platform.gcc.tune) ''
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echo "-mtune=${targetPlatform.platform.gcc.tune}" >> $out/nix-support/cc-cflags-before
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''
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# TODO: categorize these and figure out a better place for them
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+ optionalString hostPlatform.isCygwin ''
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hardening_unsupported_flags+=" pic"
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'' + optionalString targetPlatform.isMinGW ''
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hardening_unsupported_flags+=" stackprotector"
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'' + optionalString targetPlatform.isAvr ''
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hardening_unsupported_flags+=" stackprotector pic"
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'' + optionalString (targetPlatform.libc == "newlib") ''
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hardening_unsupported_flags+=" stackprotector fortify pie pic"
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'' + optionalString targetPlatform.isNetBSD ''
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hardening_unsupported_flags+=" stackprotector fortify"
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''
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+ optionalString targetPlatform.isWasm ''
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hardening_unsupported_flags+=" stackprotector fortify pie pic"
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''
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+ optionalString (libc != null && targetPlatform.isAvr) ''
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for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
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echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
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done
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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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priority = 10;
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};
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}
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