402 lines
14 KiB
Nix
402 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 ? "", stdenv, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
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, cc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenv.shell
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, zlib ? null, extraPackages ? [], extraBuildCommands ? ""
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, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
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, buildPackages ? {}
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, useMacosReexportHack ? false
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}:
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with stdenv.lib;
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assert nativeTools -> nativePrefix != "";
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assert !nativeTools ->
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cc != null && binutils != 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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assert stdenv.targetPlatform != stdenv.hostPlatform -> runCommand != null;
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# For ghdl (the vhdl language provider to gcc) we need zlib in the wrapper.
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assert cc.langVhdl or false -> zlib != null;
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let
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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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prefix = 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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binutils_bin = if nativeTools then "" else getBin binutils;
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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))
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"-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)";
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dashlessTarget = stdenv.lib.replaceStrings ["-"] ["_"] targetPlatform.config;
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# The "infix salt" is a arbitrary string added in the middle of env vars
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# defined by cc-wrapper's hooks so that multiple cc-wrappers can be used
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# without interfering. For the moment, it is defined as the target triple,
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# adjusted to be a valid bash identifier. This should be considered an
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# unstable implementation detail, however.
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infixSalt = dashlessTarget;
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# The dynamic linker has different names on different platforms. This is a
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# shell glob that ought to match it.
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dynamicLinker =
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/**/ if libc == null then null
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else if targetPlatform.system == "i686-linux" then "${libc_lib}/lib/ld-linux.so.2"
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else if targetPlatform.system == "x86_64-linux" then "${libc_lib}/lib/ld-linux-x86-64.so.2"
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# ARM with a wildcard, which can be "" or "-armhf".
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else if targetPlatform.isArm then "${libc_lib}/lib/ld-linux*.so.3"
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else if targetPlatform.system == "aarch64-linux" then "${libc_lib}/lib/ld-linux-aarch64.so.1"
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else if targetPlatform.system == "powerpc-linux" then "${libc_lib}/lib/ld.so.1"
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else if targetPlatform.system == "mips64el-linux" then "${libc_lib}/lib/ld.so.1"
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else if targetPlatform.system == "x86_64-darwin" then "/usr/lib/dyld"
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else if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1"
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else null;
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expand-response-params =
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if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
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then import ../expand-response-params { inherit (buildPackages) stdenv; }
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else "";
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in
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stdenv.mkDerivation {
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name = prefix
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+ (if name != "" then name else "${ccName}-wrapper")
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+ (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
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preferLocalBuild = true;
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inherit cc shell libc_bin libc_dev libc_lib binutils_bin coreutils_bin;
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gnugrep_bin = if nativeTools then "" else gnugrep;
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binPrefix = prefix;
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inherit infixSalt;
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outputs = [ "out" "man" ];
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passthru = {
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inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile
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prefix;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc (lambda (arg)
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(when (file-directory-p (concat arg "/include"))
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(setenv "NIX_${infixSalt}_CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt}_CFLAGS_COMPILE") " -isystem " arg "/include")))
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(when (file-directory-p (concat arg "/lib"))
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib")))
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(when (file-directory-p (concat arg "/lib64"))
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(setenv "NIX_${infixSalt}_LDFLAGS" (concat (getenv "NIX_${infixSalt}_LDFLAGS") " -L" arg "/lib64")))) '(${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 $man/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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ldPath="${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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ldPath="${binutils_bin}/bin"
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''
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
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# Solaris needs an additional ld wrapper.
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ldPath="${nativePrefix}/bin"
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exec="$ldPath/${prefix}ld"
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wrap ld-solaris ${./ld-solaris-wrapper.sh}
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'')
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+ ''
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# Create a symlink to as (the assembler). This is useful when a
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# cc-wrapper is installed in a user environment, as it ensures that
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# the right assembler is called.
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if [ -e $ldPath/${prefix}as ]; then
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ln -s $ldPath/${prefix}as $out/bin/${prefix}as
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fi
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'' + (if !useMacosReexportHack then ''
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wrap ${prefix}ld ${./ld-wrapper.sh} ''${ld:-$ldPath/${prefix}ld}
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'' else ''
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ldInner="${prefix}ld-reexport-delegate"
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wrap "$ldInner" ${./macos-sierra-reexport-hack.bash} ''${ld:-$ldPath/${prefix}ld}
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wrap "${prefix}ld" ${./ld-wrapper.sh} "$out/bin/$ldInner"
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unset ldInner
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'') + ''
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if [ -e ${binutils_bin}/bin/${prefix}ld.gold ]; then
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wrap ${prefix}ld.gold ${./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.gold
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fi
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if [ -e ${binutils_bin}/bin/ld.bfd ]; then
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wrap ${prefix}ld.bfd ${./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.bfd
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fi
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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=${prefix}cc
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export named_cxx=${prefix}c++
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export default_cxx_stdlib_compile="${default_cxx_stdlib_compile}"
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if [ -e $ccPath/${prefix}gcc ]; then
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wrap ${prefix}gcc ${./cc-wrapper.sh} $ccPath/${prefix}gcc
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ln -s ${prefix}gcc $out/bin/${prefix}cc
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export named_cc=${prefix}gcc
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export named_cxx=${prefix}g++
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elif [ -e $ccPath/clang ]; then
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wrap ${prefix}clang ${./cc-wrapper.sh} $ccPath/clang
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ln -s ${prefix}clang $out/bin/${prefix}cc
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export named_cc=${prefix}clang
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export named_cxx=${prefix}clang++
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fi
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if [ -e $ccPath/${prefix}g++ ]; then
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wrap ${prefix}g++ ${./cc-wrapper.sh} $ccPath/${prefix}g++
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ln -s ${prefix}g++ $out/bin/${prefix}c++
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elif [ -e $ccPath/clang++ ]; then
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wrap ${prefix}clang++ ${./cc-wrapper.sh} $ccPath/clang++
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ln -s ${prefix}clang++ $out/bin/${prefix}c++
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fi
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if [ -e $ccPath/cpp ]; then
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wrap ${prefix}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 ${prefix}gfortran ${./cc-wrapper.sh} $ccPath/${prefix}gfortran
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ln -sv ${prefix}gfortran $out/bin/${prefix}g77
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ln -sv ${prefix}gfortran $out/bin/${prefix}f77
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''
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+ optionalString cc.langJava or false ''
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wrap ${prefix}gcj ${./cc-wrapper.sh} $ccPath/${prefix}gcj
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''
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+ optionalString cc.langGo or false ''
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wrap ${prefix}gccgo ${./cc-wrapper.sh} $ccPath/${prefix}gccgo
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''
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+ optionalString cc.langAda or false ''
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wrap ${prefix}gnatgcc ${./cc-wrapper.sh} $ccPath/${prefix}gnatgcc
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wrap ${prefix}gnatmake ${./gnat-wrapper.sh} $ccPath/${prefix}gnatmake
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wrap ${prefix}gnatbind ${./gnat-wrapper.sh} $ccPath/${prefix}gnatbind
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wrap ${prefix}gnatlink ${./gnatlink-wrapper.sh} $ccPath/${prefix}gnatlink
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''
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+ optionalString cc.langVhdl or false ''
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ln -s $ccPath/${prefix}ghdl $out/bin/${prefix}ghdl
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'';
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propagatedBuildInputs = extraPackages;
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setupHook = ./setup-hook.sh;
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postFixup =
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''
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set -u
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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 -idirafter ${cc}/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
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echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags
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echo "${libc_lib}" > $out/nix-support/orig-libc
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echo "${libc_dev}" > $out/nix-support/orig-libc-dev
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##
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## Dynamic linker support
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##
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if [[ -z ''${dynamicLinker+x} ]]; then
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echo "Don't know the name of the dynamic linker for platform '${targetPlatform.config}', so guessing instead." >&2
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local dynamicLinker="${libc_lib}/lib/ld*.so.?"
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fi
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# Expand globs to fill array of options
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dynamicLinker=($dynamicLinker)
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case ''${#dynamicLinker[@]} in
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0) echo "No dynamic linker found for platform '${targetPlatform.config}'." >&2;;
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1) echo "Using dynamic linker: '$dynamicLinker'" >&2;;
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*) echo "Multiple dynamic linkers found for platform '${targetPlatform.config}'." >&2;;
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esac
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if [ -n "$dynamicLinker" ]; then
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echo $dynamicLinker > $out/nix-support/dynamic-linker
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'' + (if targetPlatform.isDarwin then ''
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printf "export LD_DYLD_PATH=%q\n" "$dynamicLinker" >> $out/nix-support/setup-hook
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'' else ''
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if [ -e ${libc_lib}/lib/32/ld-linux.so.2 ]; then
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echo ${libc_lib}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
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fi
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local ldflagsBefore=(-dynamic-linker "$dynamicLinker")
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'') + ''
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fi
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# The dynamic linker is passed in `ldflagsBefore' to allow
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# explicit overrides of the dynamic linker by callers to gcc/ld
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# (the *last* value counts, so ours should come first).
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printWords "''${ldflagsBefore[@]}" > $out/nix-support/libc-ldflags-before
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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${cc_solib}/lib"
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${optionalString cc.langVhdl or false ''
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ccLDFlags+=" -L${zlib.out}/lib"
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''}
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# Find the gcc libraries path (may work only without multilib).
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${optionalString cc.langAda or false ''
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basePath=`echo ${cc_solib}/lib/*/*/*`
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ccCFlags+=" -B$basePath -I$basePath/adainclude"
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gnatCFlags="-aI$basePath/adainclude -aO$basePath/adalib"
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echo "$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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##
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## User env support
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##
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# Propagate the wrapped cc so that if you install the wrapper,
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# you get tools like gcov, the manpages, etc. as well (including
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# for binutils and Glibc).
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printWords ${cc} ${binutils_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages
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printWords ${cc.man or ""} > $man/nix-support/propagated-user-env-packages
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''
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+ ''
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##
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## Hardening support
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##
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# some linkers on some platforms don't support specific -z flags
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export hardening_unsupported_flags=""
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if [[ "$($ldPath/${prefix}ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
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hardening_unsupported_flags+=" bindnow"
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fi
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if [[ "$($ldPath/${prefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
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hardening_unsupported_flags+=" relro"
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fi
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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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+ ''
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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 ${./utils.sh} $out/nix-support/utils.sh
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##
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## Extra custom steps
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##
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''
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+ extraBuildCommands;
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inherit dynamicLinker expand-response-params;
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# for substitution in utils.sh
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expandResponseParams = "${expand-response-params}/bin/expand-response-params";
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crossAttrs = {
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shell = shell.crossDrv + shell.crossDrv.shellPath;
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};
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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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} // optionalAttrs useMacosReexportHack {
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platforms = stdenv.lib.platforms.darwin;
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};
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}
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