forked from mirrors/nixpkgs
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
|
||
# 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 = (builtins.parseDrvName cc.name).version;
|
||
ccName = (builtins.parseDrvName cc.name).name;
|
||
|
||
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;
|
||
# 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 ${libcxx}/include/c++/v1"
|
||
else "";
|
||
|
||
# The "infix salt" is a arbitrary string added in the middle of env vars
|
||
# defined by cc-wrapper's hooks so that multiple cc-wrappers can be used
|
||
# without interfering. For the moment, it is defined as the target triple,
|
||
# adjusted to be a valid bash identifier. This should be considered an
|
||
# unstable implementation detail, however.
|
||
infixSalt = replaceStrings ["-" "."] ["_" "_"] targetPlatform.config;
|
||
|
||
expand-response-params =
|
||
if buildPackages.stdenv.cc or null != null && buildPackages.stdenv.cc != "/dev/null"
|
||
then import ../expand-response-params { inherit (buildPackages) stdenv; }
|
||
else "";
|
||
|
||
# older compilers (for example bootstrap's GCC 5) fail with -march=too-modern-cpu
|
||
isGccArchSupported = arch:
|
||
if cc.isGNU or false then
|
||
{ skylake = versionAtLeast ccVersion "6.0";
|
||
skylake-avx512 = versionAtLeast ccVersion "6.0";
|
||
cannonlake = versionAtLeast ccVersion "8.0";
|
||
icelake-client = versionAtLeast ccVersion "8.0";
|
||
icelake-server = versionAtLeast ccVersion "8.0";
|
||
knm = versionAtLeast ccVersion "8.0";
|
||
}.${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";
|
||
}.${arch} or true
|
||
else
|
||
false;
|
||
|
||
in
|
||
|
||
# Ensure bintools matches
|
||
assert libc_bin == bintools.libc_bin;
|
||
assert libc_dev == bintools.libc_dev;
|
||
assert libc_lib == bintools.libc_lib;
|
||
assert nativeTools == bintools.nativeTools;
|
||
assert nativeLibc == bintools.nativeLibc;
|
||
assert nativePrefix == bintools.nativePrefix;
|
||
|
||
stdenv.mkDerivation {
|
||
name = targetPrefix
|
||
+ (if name != "" then name else stdenv.lib.removePrefix targetPrefix "${ccName}-wrapper")
|
||
+ (stdenv.lib.optionalString (cc != null && ccVersion != "") "-${ccVersion}");
|
||
|
||
preferLocalBuild = true;
|
||
|
||
inherit cc libc_bin libc_dev libc_lib bintools coreutils_bin;
|
||
shell = getBin shell + shell.shellPath or "";
|
||
gnugrep_bin = if nativeTools then "" else gnugrep;
|
||
|
||
inherit targetPrefix infixSalt;
|
||
|
||
outputs = [ "out" ] ++ optionals propagateDoc [ "man" "info" ];
|
||
|
||
passthru = {
|
||
# "cc" is the generic name for a C compiler, but there is no one for package
|
||
# providing the linker and related tools. The two we use now are GNU
|
||
# Binutils, and Apple's "cctools"; "bintools" as an attempt to find an
|
||
# unused middle-ground name that evokes both.
|
||
inherit bintools;
|
||
inherit libc nativeTools nativeLibc nativePrefix isGNU isClang default_cxx_stdlib_compile;
|
||
|
||
emacsBufferSetup = pkgs: ''
|
||
; We should handle propagation here too
|
||
(mapc
|
||
(lambda (arg)
|
||
(when (file-directory-p (concat arg "/include"))
|
||
(setenv "NIX_${infixSalt}_CFLAGS_COMPILE" (concat (getenv "NIX_${infixSalt}_CFLAGS_COMPILE") " -isystem " arg "/include"))))
|
||
'(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
|
||
'';
|
||
};
|
||
|
||
dontBuild = true;
|
||
dontConfigure = true;
|
||
|
||
unpackPhase = ''
|
||
src=$PWD
|
||
'';
|
||
|
||
installPhase =
|
||
''
|
||
set -u
|
||
|
||
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 ${./cc-wrapper.sh} $ccPath/${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 ${./cc-wrapper.sh} $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++ ${./cc-wrapper.sh} $ccPath/${targetPrefix}g++
|
||
ln -s ${targetPrefix}g++ $out/bin/${targetPrefix}c++
|
||
elif [ -e $ccPath/clang++ ]; then
|
||
wrap ${targetPrefix}clang++ ${./cc-wrapper.sh} $ccPath/clang++
|
||
ln -s ${targetPrefix}clang++ $out/bin/${targetPrefix}c++
|
||
fi
|
||
|
||
if [ -e $ccPath/cpp ]; then
|
||
wrap ${targetPrefix}cpp ${./cc-wrapper.sh} $ccPath/cpp
|
||
fi
|
||
''
|
||
|
||
+ optionalString cc.langFortran or false ''
|
||
wrap ${targetPrefix}gfortran ${./cc-wrapper.sh} $ccPath/${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 ${./cc-wrapper.sh} $ccPath/${targetPrefix}gcj
|
||
''
|
||
|
||
+ optionalString cc.langGo or false ''
|
||
wrap ${targetPrefix}gccgo ${./cc-wrapper.sh} $ccPath/${targetPrefix}gccgo
|
||
'';
|
||
|
||
strictDeps = true;
|
||
propagatedBuildInputs = [ bintools ];
|
||
depsTargetTargetPropagated = extraPackages;
|
||
|
||
wrapperName = "CC_WRAPPER";
|
||
|
||
setupHooks = [
|
||
../setup-hooks/role.bash
|
||
./setup-hook.sh
|
||
];
|
||
|
||
postFixup =
|
||
''
|
||
set -u
|
||
|
||
# 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/"} -idirafter ${libc_dev}${libc.incdir or "/include"} ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
|
||
|
||
echo "${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}" >> $out/nix-support/cc-cflags-before
|
||
''
|
||
|
||
# -mcpu is not very useful. You should use mtune and march
|
||
# instead. It’s provided here for backwards compatibility.
|
||
+ optionalString (targetPlatform ? platform.gcc.cpu) ''
|
||
echo "-mcpu=${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;
|
||
};
|
||
}
|