nixpkgs/pkgs/build-support/cc-wrapper/default.nix

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# The Nixpkgs CC is not directly usable, since it doesn't know where
# the C library and standard header files are. Therefore the compiler
# produced by that package cannot be installed directly in a user
# environment and used from the command line. So we use a wrapper
# script that sets up the right environment variables so that the
# compiler and the linker just "work".
{ name ? ""
, stdenvNoCC
, cc ? null, libc ? null, bintools, coreutils ? null, shell ? stdenvNoCC.shell
, nativeTools, noLibc ? false, nativeLibc, nativePrefix ? ""
, propagateDoc ? cc != null && cc ? man
, extraPackages ? [], extraBuildCommands ? ""
, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
, buildPackages ? {}
, libcxx ? null
}:
with stdenvNoCC.lib;
assert nativeTools -> !propagateDoc && nativePrefix != "";
assert !nativeTools ->
cc != null && coreutils != null && gnugrep != null;
assert !(nativeLibc && noLibc);
assert (noLibc || nativeLibc) == (libc == null);
let
stdenv = stdenvNoCC;
inherit (stdenv) hostPlatform targetPlatform;
# Prefix for binaries. Customarily ends with a dash separator.
#
# TODO(@Ericson2314) Make unconditional, or optional but always true by
# default.
targetPrefix = stdenv.lib.optionalString (targetPlatform != hostPlatform)
(targetPlatform.config + "-");
ccVersion = stdenv.lib.getVersion cc;
ccName = stdenv.lib.removePrefix targetPrefix (stdenv.lib.getName cc);
libc_bin = if libc == null then null else getBin libc;
libc_dev = if libc == null then null else getDev libc;
libc_lib = if libc == null then null else getLib libc;
cc_solib = getLib cc
+ optionalString (targetPlatform != hostPlatform) "/${targetPlatform.config}";
# The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
coreutils_bin = if nativeTools then "" else getBin coreutils;
default_cxx_stdlib_compile = if (targetPlatform.isLinux && !(cc.isGNU or false) && !nativeTools && cc ? gcc) && !(targetPlatform.useLLVM or false) then
"-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)"
else if targetPlatform.isDarwin && (libcxx != null) && (cc.isClang or false) && !(targetPlatform.useLLVM or false) then
"-isystem ${libcxx}/include/c++/v1"
else "";
# The "infix salt" is a arbitrary string added in the middle of env vars
# defined by cc-wrapper's hooks so that multiple cc-wrappers can be used
# without interfering. For the moment, it is defined as the target triple,
# adjusted to be a valid bash identifier. This should be considered an
# unstable implementation detail, however.
infixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config;
expand-response-params =
if buildPackages.stdenv.hasCC && buildPackages.stdenv.cc != "/dev/null"
then import ../expand-response-params { inherit (buildPackages) stdenv; }
else "";
# older compilers (for example bootstrap's GCC 5) fail with -march=too-modern-cpu
isGccArchSupported = arch:
if cc.isGNU or false then
{ skylake = versionAtLeast ccVersion "6.0";
skylake-avx512 = versionAtLeast ccVersion "6.0";
cannonlake = versionAtLeast ccVersion "8.0";
icelake-client = versionAtLeast ccVersion "8.0";
icelake-server = versionAtLeast ccVersion "8.0";
knm = versionAtLeast ccVersion "8.0";
}.${arch} or true
else if cc.isClang or false then
{ cannonlake = versionAtLeast ccVersion "5.0";
icelake-client = versionAtLeast ccVersion "7.0";
icelake-server = versionAtLeast ccVersion "7.0";
knm = versionAtLeast ccVersion "7.0";
}.${arch} or true
else
false;
in
# Ensure bintools matches
assert libc_bin == bintools.libc_bin;
assert libc_dev == bintools.libc_dev;
assert libc_lib == bintools.libc_lib;
assert nativeTools == bintools.nativeTools;
assert nativeLibc == bintools.nativeLibc;
assert nativePrefix == bintools.nativePrefix;
stdenv.mkDerivation {
pname = targetPrefix
+ (if name != "" then name else "${ccName}-wrapper");
version = if cc == null then null else ccVersion;
preferLocalBuild = true;
inherit cc libc_bin libc_dev libc_lib bintools coreutils_bin;
shell = getBin shell + shell.shellPath or "";
gnugrep_bin = if nativeTools then "" else gnugrep;
inherit targetPrefix infixSalt;
outputs = [ "out" ] ++ optionals propagateDoc [ "man" "info" ];
passthru = {
# "cc" is the generic name for a C compiler, but there is no one for package
# providing the linker and related tools. The two we use now are GNU
# Binutils, and Apple's "cctools"; "bintools" as an attempt to find an
# unused middle-ground name that evokes both.
inherit bintools;
inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile;
emacsBufferSetup = pkgs: ''
; We should handle propagation here too
(mapc
(lambda (arg)
(when (file-directory-p (concat arg "/include"))
(setenv "NIX_${infixSalt}_CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt}_CFLAGS_COMPILE") " -isystem " arg "/include"))))
'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
'';
};
dontBuild = true;
dontConfigure = true;
unpackPhase = ''
src=$PWD
'';
wrapper = ./cc-wrapper.sh;
installPhase =
''
mkdir -p $out/bin $out/nix-support
wrap() {
local dst="$1"
local wrapper="$2"
export prog="$3"
substituteAll "$wrapper" "$out/bin/$dst"
chmod +x "$out/bin/$dst"
}
''
+ (if nativeTools then ''
echo ${if targetPlatform.isDarwin then cc else nativePrefix} > $out/nix-support/orig-cc
ccPath="${if targetPlatform.isDarwin then cc else nativePrefix}/bin"
'' else ''
echo $cc > $out/nix-support/orig-cc
ccPath="${cc}/bin"
'')
+ ''
# Create symlinks to everything in the bintools wrapper.
for bbin in $bintools/bin/*; do
mkdir -p "$out/bin"
ln -s "$bbin" "$out/bin/$(basename $bbin)"
done
# We export environment variables pointing to the wrapped nonstandard
# cmds, lest some lousy configure script use those to guess compiler
# version.
export named_cc=${targetPrefix}cc
export named_cxx=${targetPrefix}c++
export default_cxx_stdlib_compile="${default_cxx_stdlib_compile}"
if [ -e $ccPath/${targetPrefix}gcc ]; then
wrap ${targetPrefix}gcc $wrapper $ccPath/${targetPrefix}gcc
ln -s ${targetPrefix}gcc $out/bin/${targetPrefix}cc
export named_cc=${targetPrefix}gcc
export named_cxx=${targetPrefix}g++
elif [ -e $ccPath/clang ]; then
wrap ${targetPrefix}clang $wrapper $ccPath/clang
ln -s ${targetPrefix}clang $out/bin/${targetPrefix}cc
export named_cc=${targetPrefix}clang
export named_cxx=${targetPrefix}clang++
fi
if [ -e $ccPath/${targetPrefix}g++ ]; then
wrap ${targetPrefix}g++ $wrapper $ccPath/${targetPrefix}g++
ln -s ${targetPrefix}g++ $out/bin/${targetPrefix}c++
elif [ -e $ccPath/clang++ ]; then
wrap ${targetPrefix}clang++ $wrapper $ccPath/clang++
ln -s ${targetPrefix}clang++ $out/bin/${targetPrefix}c++
fi
if [ -e $ccPath/cpp ]; then
wrap ${targetPrefix}cpp $wrapper $ccPath/cpp
fi
''
+ optionalString cc.langFortran or false ''
wrap ${targetPrefix}gfortran $wrapper $ccPath/${targetPrefix}gfortran
ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}g77
ln -sv ${targetPrefix}gfortran $out/bin/${targetPrefix}f77
''
+ optionalString cc.langJava or false ''
wrap ${targetPrefix}gcj $wrapper $ccPath/${targetPrefix}gcj
''
+ optionalString cc.langGo or false ''
wrap ${targetPrefix}gccgo $wrapper $ccPath/${targetPrefix}gccgo
'';
strictDeps = true;
propagatedBuildInputs = [ bintools ];
depsTargetTargetPropagated = extraPackages;
wrapperName = "CC_WRAPPER";
setupHooks = [
../setup-hooks/role.bash
./setup-hook.sh
];
postFixup =
''
# Backwards compatability for packages expecting this file, e.g. with
# `$NIX_CC/nix-support/dynamic-linker`.
#
# TODO(@Ericson2314): Remove this after stable release and force
# everyone to refer to bintools-wrapper directly.
if [[ -f "$bintools/nix-support/dynamic-linker" ]]; then
ln -s "$bintools/nix-support/dynamic-linker" "$out/nix-support"
fi
if [[ -f "$bintools/nix-support/dynamic-linker-m32" ]]; then
ln -s "$bintools/nix-support/dynamic-linker-m32" "$out/nix-support"
fi
''
+ optionalString (libc != null) (''
##
## General libc support
##
# The "-B${libc_lib}/lib/" flag is a quick hack to force gcc to link
# against the crt1.o from our own glibc, rather than the one in
# /usr/lib. (This is only an issue when using an `impure'
# compiler/linker, i.e., one that searches /usr/lib and so on.)
#
# Unfortunately, setting -B appears to override the default search
# path. Thus, the gcc-specific "../includes-fixed" directory is
# now longer searched and glibc's <limits.h> header fails to
# compile, because it uses "#include_next <limits.h>" to find the
# limits.h file in ../includes-fixed. To remedy the problem,
# another -idirafter is necessary to add that directory again.
echo "-B${libc_lib}${libc.libdir or "/lib/"}" >> $out/nix-support/libc-cflags
echo "-idirafter ${libc_dev}${libc.incdir or "/include"}" >> $out/nix-support/libc-cflags
'' + optionalString isGNU ''
for dir in "${cc}"/lib/gcc/*/*/include-fixed; do
echo '-idirafter' ''${dir} >> $out/nix-support/libc-cflags
done
'' + ''
echo "${libc_lib}" > $out/nix-support/orig-libc
echo "${libc_dev}" > $out/nix-support/orig-libc-dev
'')
+ optionalString (!nativeTools) ''
##
## Initial CFLAGS
##
# GCC shows ${cc_solib}/lib in `gcc -print-search-dirs', but not
# ${cc_solib}/lib64 (even though it does actually search there...)..
# This confuses libtool. So add it to the compiler tool search
# path explicitly.
if [ -e "${cc_solib}/lib64" -a ! -L "${cc_solib}/lib64" ]; then
ccLDFlags+=" -L${cc_solib}/lib64"
ccCFlags+=" -B${cc_solib}/lib64"
fi
ccLDFlags+=" -L${cc_solib}/lib"
ccCFlags+=" -B${cc_solib}/lib"
echo "$ccLDFlags" > $out/nix-support/cc-ldflags
echo "$ccCFlags" > $out/nix-support/cc-cflags
'' + optionalString (targetPlatform.isDarwin && (libcxx != null) && (cc.isClang or false)) ''
echo " -L${libcxx}/lib" >> $out/nix-support/cc-ldflags
'' + optionalString propagateDoc ''
##
## Man page and info support
##
ln -s ${cc.man} $man
ln -s ${cc.info} $info
''
+ ''
##
## Hardening support
##
export hardening_unsupported_flags="${builtins.concatStringsSep " " (cc.hardeningUnsupportedFlags or [])}"
''
# Machine flags. These are necessary to support
# TODO: We should make a way to support miscellaneous machine
# flags and other gcc flags as well.
# Always add -march based on cpu in triple. Sometimes there is a
# discrepency (x86_64 vs. x86-64), so we provide an "arch" arg in
# that case.
+ optionalString ((targetPlatform ? platform.gcc.arch) &&
isGccArchSupported targetPlatform.platform.gcc.arch) ''
echo "-march=${targetPlatform.platform.gcc.arch}" >> $out/nix-support/cc-cflags-before
''
# -mcpu is not very useful. You should use mtune and march
# instead. Its provided here for backwards compatibility.
+ optionalString (targetPlatform ? platform.gcc.cpu) ''
echo "-mcpu=${targetPlatform.platform.gcc.cpu}" >> $out/nix-support/cc-cflags-before
''
# -mfloat-abi only matters on arm32 but we set it here
# unconditionally just in case. If the abi specifically sets hard
# vs. soft floats we use it here.
+ optionalString (targetPlatform ? platform.gcc.float-abi) ''
echo "-mfloat-abi=${targetPlatform.platform.gcc.float-abi}" >> $out/nix-support/cc-cflags-before
''
+ optionalString (targetPlatform ? platform.gcc.fpu) ''
echo "-mfpu=${targetPlatform.platform.gcc.fpu}" >> $out/nix-support/cc-cflags-before
''
+ optionalString (targetPlatform ? platform.gcc.mode) ''
echo "-mmode=${targetPlatform.platform.gcc.mode}" >> $out/nix-support/cc-cflags-before
''
+ optionalString (targetPlatform ? platform.gcc.tune &&
isGccArchSupported targetPlatform.platform.gcc.tune) ''
echo "-mtune=${targetPlatform.platform.gcc.tune}" >> $out/nix-support/cc-cflags-before
''
# TODO: categorize these and figure out a better place for them
+ optionalString hostPlatform.isCygwin ''
hardening_unsupported_flags+=" pic"
'' + optionalString targetPlatform.isMinGW ''
hardening_unsupported_flags+=" stackprotector"
'' + optionalString targetPlatform.isAvr ''
hardening_unsupported_flags+=" stackprotector pic"
'' + optionalString (targetPlatform.libc == "newlib") ''
hardening_unsupported_flags+=" stackprotector fortify pie pic"
'' + optionalString targetPlatform.isNetBSD ''
hardening_unsupported_flags+=" stackprotector fortify"
''
+ optionalString targetPlatform.isWasm ''
hardening_unsupported_flags+=" stackprotector fortify pie pic"
''
+ optionalString (libc != null && targetPlatform.isAvr) ''
for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
done
''
+ ''
substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
##
## Extra custom steps
##
''
+ extraBuildCommands;
inherit expand-response-params;
# for substitution in utils.bash
expandResponseParams = "${expand-response-params}/bin/expand-response-params";
meta =
let cc_ = if cc != null then cc else {}; in
(if cc_ ? meta then removeAttrs cc.meta ["priority"] else {}) //
{ description =
stdenv.lib.attrByPath ["meta" "description"] "System C compiler" cc_
+ " (wrapper script)";
priority = 10;
};
}