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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 ? "", stdenv, nativeTools, nativeLibc, nativePrefix ? ""
, cc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenv.shell
, zlib ? null, extraPackages ? [], extraBuildCommands ? ""
, dyld ? null # TODO: should this be a setup-hook on dyld?
, isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
}:
with stdenv.lib;
assert nativeTools -> nativePrefix != "";
assert !nativeTools ->
cc != null && binutils != null && coreutils != null && gnugrep != null;
assert !nativeLibc -> libc != null;
# For ghdl (the vhdl language provider to gcc) we need zlib in the wrapper.
assert cc.langVhdl or false -> zlib != null;
let
ccVersion = (builtins.parseDrvName cc.name).version;
ccName = (builtins.parseDrvName cc.name).name;
libc_bin = if nativeLibc then null else getBin libc;
libc_dev = if nativeLibc then null else getDev libc;
libc_lib = if nativeLibc then null else getLib libc;
cc_solib = getLib cc;
binutils_bin = if nativeTools then "" else getBin binutils;
# The wrapper scripts use 'cat' and 'grep', so we may need coreutils.
coreutils_bin = if nativeTools then "" else getBin coreutils;
in
stdenv.mkDerivation {
name =
(if name != "" then name else ccName + "-wrapper") +
(if cc != null && ccVersion != "" then "-" + ccVersion else "");
preferLocalBuild = true;
inherit cc shell libc_bin libc_dev libc_lib binutils_bin coreutils_bin;
gnugrep_bin = if nativeTools then "" else gnugrep;
passthru = {
inherit libc nativeTools nativeLibc nativePrefix isGNU isClang;
emacsBufferSetup = pkgs: ''
; We should handle propagation here too
(mapc (lambda (arg)
(when (file-directory-p (concat arg "/include"))
(setenv "NIX_CFLAGS_COMPILE" (concat (getenv "NIX_CFLAGS_COMPILE") " -isystem " arg "/include")))
(when (file-directory-p (concat arg "/lib"))
(setenv "NIX_LDFLAGS" (concat (getenv "NIX_LDFLAGS") " -L" arg "/lib")))
(when (file-directory-p (concat arg "/lib64"))
(setenv "NIX_LDFLAGS" (concat (getenv "NIX_LDFLAGS") " -L" arg "/lib64")))) '(${concatStringsSep " " (map (pkg: "\"${pkg}\"") pkgs)}))
'';
};
buildCommand =
''
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"
}
''
+ optionalString (!nativeLibc) (if (!stdenv.isDarwin) then ''
dynamicLinker="${libc_lib}/lib/$dynamicLinker"
echo $dynamicLinker > $out/nix-support/dynamic-linker
if [ -e ${libc_lib}/lib/32/ld-linux.so.2 ]; then
echo ${libc_lib}/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
fi
# The dynamic linker is passed in `ldflagsBefore' to allow
# explicit overrides of the dynamic linker by callers to gcc/ld
# (the *last* value counts, so ours should come first).
echo "-dynamic-linker" $dynamicLinker > $out/nix-support/libc-ldflags-before
'' else ''
echo $dynamicLinker > $out/nix-support/dynamic-linker
echo "export LD_DYLD_PATH=\"$dynamicLinker\"" >> $out/nix-support/setup-hook
'')
+ optionalString (!nativeLibc) ''
# The "-B${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}/lib/ -idirafter ${libc_dev}/include -idirafter ${cc}/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags
echo "${libc_lib}" > $out/nix-support/orig-libc
echo "${libc_dev}" > $out/nix-support/orig-libc-dev
''
+ (if nativeTools then ''
ccPath="${if stdenv.isDarwin then cc else nativePrefix}/bin"
ldPath="${nativePrefix}/bin"
'' else ''
echo $cc > $out/nix-support/orig-cc
# 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"
${optionalString cc.langVhdl or false ''
ccLDFlags+=" -L${zlib.out}/lib"
''}
# Find the gcc libraries path (may work only without multilib).
${optionalString cc.langAda or false ''
basePath=`echo ${cc_solib}/lib/*/*/*`
ccCFlags+=" -B$basePath -I$basePath/adainclude"
gnatCFlags="-aI$basePath/adainclude -aO$basePath/adalib"
echo "$gnatCFlags" > $out/nix-support/gnat-cflags
''}
if [ -e $ccPath/clang ]; then
# Need files like crtbegin.o from gcc
# It's unclear if these will ever be provided by an LLVM project
ccCFlags="$ccCFlags -B$basePath"
ccCFlags="$ccCFlags -isystem$cc/lib/clang/$ccVersion/include"
fi
echo "$ccLDFlags" > $out/nix-support/cc-ldflags
echo "$ccCFlags" > $out/nix-support/cc-cflags
ccPath="${cc}/bin"
ldPath="${binutils_bin}/bin"
# Propagate the wrapped cc so that if you install the wrapper,
# you get tools like gcov, the manpages, etc. as well (including
# for binutils and Glibc).
echo ${cc} ${cc.man or ""} ${binutils_bin} ${libc_bin} > $out/nix-support/propagated-user-env-packages
echo ${toString extraPackages} > $out/nix-support/propagated-native-build-inputs
''
+ optionalString (stdenv.isSunOS && nativePrefix != "") ''
# Solaris needs an additional ld wrapper.
ldPath="${nativePrefix}/bin"
exec="$ldPath/ld"
wrap ld-solaris ${./ld-solaris-wrapper.sh}
'')
+ ''
# Create a symlink to as (the assembler). This is useful when a
# cc-wrapper is installed in a user environment, as it ensures that
# the right assembler is called.
if [ -e $ldPath/as ]; then
ln -s $ldPath/as $out/bin/as
fi
wrap ld ${./ld-wrapper.sh} ''${ld:-$ldPath/ld}
if [ -e ${binutils_bin}/bin/ld.gold ]; then
wrap ld.gold ${./ld-wrapper.sh} ${binutils_bin}/bin/ld.gold
fi
if [ -e ${binutils_bin}/bin/ld.bfd ]; then
wrap ld.bfd ${./ld-wrapper.sh} ${binutils_bin}/bin/ld.bfd
fi
export real_cc=cc
export real_cxx=c++
export default_cxx_stdlib_compile="${
if stdenv.isLinux && !(cc.isGNU or false)
then "-isystem $(echo -n ${cc.gcc}/include/c++/*) -isystem $(echo -n ${cc.gcc}/include/c++/*)/$(${cc.gcc}/bin/gcc -dumpmachine)"
else ""
}"
if [ -e $ccPath/gcc ]; then
wrap gcc ${./cc-wrapper.sh} $ccPath/gcc
ln -s gcc $out/bin/cc
export real_cc=gcc
export real_cxx=g++
elif [ -e $ccPath/clang ]; then
wrap clang ${./cc-wrapper.sh} $ccPath/clang
ln -s clang $out/bin/cc
export real_cc=clang
export real_cxx=clang++
fi
if [ -e $ccPath/g++ ]; then
wrap g++ ${./cc-wrapper.sh} $ccPath/g++
ln -s g++ $out/bin/c++
elif [ -e $ccPath/clang++ ]; then
wrap clang++ ${./cc-wrapper.sh} $ccPath/clang++
ln -s clang++ $out/bin/c++
fi
if [ -e $ccPath/cpp ]; then
wrap cpp ${./cc-wrapper.sh} $ccPath/cpp
fi
''
+ optionalString cc.langFortran or false ''
wrap gfortran ${./cc-wrapper.sh} $ccPath/gfortran
ln -sv gfortran $out/bin/g77
ln -sv gfortran $out/bin/f77
''
+ optionalString cc.langJava or false ''
wrap gcj ${./cc-wrapper.sh} $ccPath/gcj
''
+ optionalString cc.langGo or false ''
wrap gccgo ${./cc-wrapper.sh} $ccPath/gccgo
''
+ optionalString cc.langAda or false ''
wrap gnatgcc ${./cc-wrapper.sh} $ccPath/gnatgcc
wrap gnatmake ${./gnat-wrapper.sh} $ccPath/gnatmake
wrap gnatbind ${./gnat-wrapper.sh} $ccPath/gnatbind
wrap gnatlink ${./gnatlink-wrapper.sh} $ccPath/gnatlink
''
+ optionalString cc.langVhdl or false ''
ln -s $ccPath/ghdl $out/bin/ghdl
''
+ ''
substituteAll ${./setup-hook.sh} $out/nix-support/setup-hook.tmp
cat $out/nix-support/setup-hook.tmp >> $out/nix-support/setup-hook
rm $out/nix-support/setup-hook.tmp
# some linkers on some platforms don't support specific -z flags
hardening_unsupported_flags=""
if [[ "$($ldPath/ld -z now 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
hardening_unsupported_flags+=" bindnow"
fi
if [[ "$($ldPath/ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
hardening_unsupported_flags+=" relro"
fi
substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
cp -p ${./utils.sh} $out/nix-support/utils.sh
''
+ extraBuildCommands;
# The dynamic linker has different names on different Linux platforms.
dynamicLinker =
if !nativeLibc then
(if stdenv.system == "i686-linux" then "ld-linux.so.2" else
if stdenv.system == "x86_64-linux" then "ld-linux-x86-64.so.2" else
# ARM with a wildcard, which can be "" or "-armhf".
if stdenv.isArm then "ld-linux*.so.3" else
if stdenv.system == "aarch64-linux" then "ld-linux-aarch64.so.1" else
if stdenv.system == "powerpc-linux" then "ld.so.1" else
if stdenv.system == "mips64el-linux" then "ld.so.1" else
if stdenv.system == "x86_64-darwin" then "/usr/lib/dyld" else
abort "Don't know the name of the dynamic linker for this platform.")
else "";
crossAttrs = {
shell = shell.crossDrv + shell.crossDrv.shellPath;
libc = stdenv.ccCross.libc;
#
# This is not the best way to do this. I think the reference should be
# the style in the gcc-cross-wrapper, but to keep a stable stdenv now I
# do this sufficient if/else.
dynamicLinker =
(if stdenv.cross.arch == "arm" then "ld-linux.so.3" else
if stdenv.cross.arch == "mips" then "ld.so.1" else
if stdenv.lib.hasSuffix "pc-gnu" stdenv.cross.config then "ld.so.1" else
abort "don't know the name of the dynamic linker for this platform");
};
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)";
};
}