365 lines
15 KiB
Nix
365 lines
15 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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, dyld ? null # TODO: should this be a setup-hook on dyld?
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, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
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, hostPlatform, targetPlatform
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, runCommand ? null
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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 targetPlatform != 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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# 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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# TODO(@Ericson2314) Make unconditional
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infixSalt = stdenv.lib.optionalString (targetPlatform != hostPlatform) dashlessTarget;
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infixSalt_ = stdenv.lib.optionalString (targetPlatform != hostPlatform) (dashlessTarget + "_");
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_infixSalt = stdenv.lib.optionalString (targetPlatform != hostPlatform) ("_" + dashlessTarget);
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# We want to prefix all NIX_ flags with the target triple
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preWrap = textFile:
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# TODO: Do even when not cross on next mass-rebuild
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# TODO: use @target_tripple@ for consistency
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if targetPlatform == hostPlatform
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then textFile
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else runCommand "sed-nix-env-vars" {} (''
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cp --no-preserve=mode ${textFile} $out
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sed -i $out \
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-e 's^NIX_^NIX_${infixSalt_}^g' \
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-e 's^addCVars^addCVars${_infixSalt}^g' \
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-e 's^\[ -z "\$crossConfig" \]^\[\[ "${builtins.toString (targetPlatform != hostPlatform)}" || -z "$crossConfig" \]\]^g'
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'' + stdenv.lib.optionalString (textFile == ./setup-hook.sh) ''
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cat << 'EOF' >> $out
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for CMD in ar as nm objcopy ranlib strip strings size ld
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do
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# which is not part of stdenv, but compgen will do for now
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if
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PATH=$_PATH type -p ${prefix}$CMD > /dev/null
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then
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export ''$(echo "$CMD" | tr "[:lower:]" "[:upper:]")=${prefix}''${CMD};
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fi
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done
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EOF
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sed -i $out -e 's_envHooks_crossEnvHooks_g'
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'' + ''
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# NIX_ things which we don't both use and define, we revert them
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#asymmetric=$(
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# for pre in "" "\\$"
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# do
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# grep -E -ho $pre'NIX_[a-zA-Z_]*' ./* | sed 's/\$//' | sort | uniq
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# done | sort | uniq -c | sort -nr | sed -n 's/^1 NIX_//gp')
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# hard-code for now
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asymmetric=("CXXSTDLIB_COMPILE" "CC")
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# The ([^a-zA-Z_]|$) bussiness is to ensure environment variables that
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# begin with `NIX_CC` don't also get blacklisted.
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for var in "''${asymmetric[@]}"
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do
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sed -i $out -E -e "s~NIX_${infixSalt_}$var([^a-zA-Z_]|$)~NIX_$var\1~g"
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done
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'');
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in
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stdenv.mkDerivation {
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name = prefix
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+ (if name != "" then name else "${ccName}-wrapper")
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+ (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
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preferLocalBuild = true;
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inherit cc shell libc_bin libc_dev libc_lib binutils_bin coreutils_bin;
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gnugrep_bin = if nativeTools then "" else gnugrep;
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passthru = {
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inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile
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prefix infixSalt infixSalt_ _infixSalt;
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emacsBufferSetup = pkgs: ''
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; We should handle propagation here too
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(mapc (lambda (arg)
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(when (file-directory-p (concat arg "/include"))
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(setenv "NIX_${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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buildCommand =
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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="$3"
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substituteAll "$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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+ optionalString (libc != null) (if (!targetPlatform.isDarwin) then ''
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dynamicLinker="${libc_lib}/lib/$dynamicLinker"
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echo $dynamicLinker > $out/nix-support/dynamic-linker
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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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# 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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echo "-dynamic-linker" $dynamicLinker > $out/nix-support/libc-ldflags-before
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'' else ''
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echo $dynamicLinker > $out/nix-support/dynamic-linker
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echo "export LD_DYLD_PATH=\"$dynamicLinker\"" >> $out/nix-support/setup-hook
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'')
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+ optionalString (libc != null) ''
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# The "-B${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}" > $out/nix-support/orig-libc-dev
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''
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+ (if nativeTools then ''
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ccPath="${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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# 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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if [ -e $ccPath/clang ]; then
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# Need files like crtbegin.o from gcc
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# It's unclear if these will ever be provided by an LLVM project
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ccCFlags="$ccCFlags -B$basePath"
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ccCFlags="$ccCFlags -isystem$cc/lib/clang/$ccVersion/include"
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fi
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echo "$ccLDFlags" > $out/nix-support/cc-ldflags
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echo "$ccCFlags" > $out/nix-support/cc-cflags
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ccPath="${cc}/bin"
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ldPath="${binutils_bin}/bin"
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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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echo ${cc} ${cc.man or ""} ${binutils_bin} ${if libc == null then "" else libc_bin} > $out/nix-support/propagated-user-env-packages
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echo ${toString extraPackages} > $out/nix-support/propagated-native-build-inputs
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''
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+ optionalString (targetPlatform.isSunOS && nativePrefix != "") ''
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# Solaris needs an additional ld wrapper.
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ldPath="${nativePrefix}/bin"
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exec="$ldPath/${prefix}ld"
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wrap ld-solaris ${preWrap ./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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wrap ${prefix}ld ${preWrap ./ld-wrapper.sh} ''${ld:-$ldPath/${prefix}ld}
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if [ -e ${binutils_bin}/bin/${prefix}ld.gold ]; then
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wrap ${prefix}ld.gold ${preWrap ./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 ${preWrap ./ld-wrapper.sh} ${binutils_bin}/bin/${prefix}ld.bfd
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fi
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export real_cc=${prefix}cc
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export real_cxx=${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 ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gcc
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ln -s ${prefix}gcc $out/bin/${prefix}cc
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export real_cc=${prefix}gcc
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export real_cxx=${prefix}g++
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elif [ -e $ccPath/clang ]; then
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wrap ${prefix}clang ${preWrap ./cc-wrapper.sh} $ccPath/clang
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ln -s ${prefix}clang $out/bin/${prefix}cc
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export real_cc=clang
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export real_cxx=clang++
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fi
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if [ -e $ccPath/${prefix}g++ ]; then
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wrap ${prefix}g++ ${preWrap ./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++ ${preWrap ./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 ${preWrap ./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 ${preWrap ./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 ${preWrap ./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 ${preWrap ./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 ${preWrap ./cc-wrapper.sh} $ccPath/${prefix}gnatgcc
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wrap ${prefix}gnatmake ${preWrap ./gnat-wrapper.sh} $ccPath/${prefix}gnatmake
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wrap ${prefix}gnatbind ${preWrap ./gnat-wrapper.sh} $ccPath/${prefix}gnatbind
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wrap ${prefix}gnatlink ${preWrap ./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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+ ''
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substituteAll ${preWrap ./setup-hook.sh} $out/nix-support/setup-hook.tmp
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cat $out/nix-support/setup-hook.tmp >> $out/nix-support/setup-hook
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rm $out/nix-support/setup-hook.tmp
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# some linkers on some platforms don't support specific -z flags
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hardening_unsupported_flags=""
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if [[ "$($ldPath/${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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substituteAll ${preWrap ./add-flags.sh} $out/nix-support/add-flags.sh
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substituteAll ${preWrap ./add-hardening.sh} $out/nix-support/add-hardening.sh
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cp -p ${preWrap ./utils.sh} $out/nix-support/utils.sh
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''
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+ extraBuildCommands;
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# The dynamic linker has different names on different Linux platforms.
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#
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# TODO(1b62c9c06173f4d5e6b090e5ae0c68fa5f478faf): This is not the best way to
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# do this. I think the reference should be the style in the gcc-cross-wrapper,
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# but to keep a stable stdenv now I do this sufficient if/else.
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dynamicLinker =
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if !nativeLibc then
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(if targetPlatform.system == "i686-linux" then "ld-linux.so.2" else
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if targetPlatform.system == "x86_64-linux" then "ld-linux-x86-64.so.2" else
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# ARM with a wildcard, which can be "" or "-armhf".
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if targetPlatform.isArm32 then "ld-linux*.so.3" else
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if targetPlatform.system == "aarch64-linux" then "ld-linux-aarch64.so.1" else
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if targetPlatform.system == "powerpc-linux" then "ld.so.1" else
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if targetPlatform.system == "mips64el-linux" then "ld.so.1" else
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if targetPlatform.system == "x86_64-darwin" then "/usr/lib/dyld" else
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if stdenv.lib.hasSuffix "pc-gnu" targetPlatform.config then "ld.so.1" else
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abort "Don't know the name of the dynamic linker for this platform.")
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else "";
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crossAttrs = {
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shell = shell.crossDrv + shell.crossDrv.shellPath;
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libc = stdenv.ccCross.libc;
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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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};
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}
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