nixpkgs/pkgs/build-support/gcc-wrapper/default.nix
2014-10-11 23:10:27 +02:00

252 lines
8.7 KiB
Nix

# The Nixpkgs GCC 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 ? ""
, gcc ? null, libc ? null, binutils ? null, coreutils ? null, shell ? stdenv.shell
, zlib ? null, extraPackages ? []
}:
with stdenv.lib;
assert nativeTools -> nativePrefix != "";
assert !nativeTools -> gcc != null && binutils != null && coreutils != null;
assert !nativeLibc -> libc != null;
# For ghdl (the vhdl language provider to gcc) we need zlib in the wrapper.
assert gcc.langVhdl or false -> zlib != null;
let
gccVersion = (builtins.parseDrvName gcc.name).version;
gccName = (builtins.parseDrvName gcc.name).name;
in
stdenv.mkDerivation {
name =
(if name != "" then name else gccName + "-wrapper") +
(if gcc != null && gccVersion != "" then "-" + gccVersion else "");
preferLocalBuild = true;
inherit gcc shell;
libc = if nativeLibc then null else libc;
binutils = if nativeTools then null else binutils;
# The wrapper scripts use 'cat', so we may need coreutils.
coreutils = if nativeTools then null else coreutils;
passthru = { inherit nativeTools nativeLibc nativePrefix; };
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) ''
dynamicLinker="$libc/lib/$dynamicLinker"
echo $dynamicLinker > $out/nix-support/dynamic-linker
if [ -e $libc/lib/32/ld-linux.so.2 ]; then
echo $libc/lib/32/ld-linux.so.2 > $out/nix-support/dynamic-linker-m32
fi
# The "-B$libc/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/ -idirafter $libc/include -idirafter $gcc/lib/gcc/*/*/include-fixed" > $out/nix-support/libc-cflags
echo "-L$libc/lib" > $out/nix-support/libc-ldflags
# 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
echo $libc > $out/nix-support/orig-libc
''
+ (if nativeTools then ''
gccPath="${nativePrefix}/bin"
ldPath="${nativePrefix}/bin"
'' else ''
echo $gcc > $out/nix-support/orig-gcc
# GCC shows $gcc/lib in `gcc -print-search-dirs', but not
# $gcc/lib64 (even though it does actually search there...)..
# This confuses libtool. So add it to the compiler tool search
# path explicitly.
if [ -e "$gcc/lib64" -a ! -L "$gcc/lib64" ]; then
gccLDFlags+=" -L$gcc/lib64"
gccCFlags+=" -B$gcc/lib64"
fi
gccLDFlags+=" -L$gcc/lib"
${optionalString gcc.langVhdl or false ''
gccLDFlags+=" -L${zlib}/lib"
''}
# Find the gcc libraries path (may work only without multilib).
${optionalString gcc.langAda or false ''
basePath=`echo $gcc/lib/*/*/*`
gccCFlags+=" -B$basePath -I$basePath/adainclude"
gnatCFlags="-aI$basePath/adainclude -aO$basePath/adalib"
echo "$gnatCFlags" > $out/nix-support/gnat-cflags
''}
echo "$gccLDFlags" > $out/nix-support/gcc-ldflags
echo "$gccCFlags" > $out/nix-support/gcc-cflags
gccPath="$gcc/bin"
ldPath="$binutils/bin"
# Propagate the wrapped gcc so that if you install the wrapper,
# you get tools like gcov, the manpages, etc. as well (including
# for binutils and Glibc).
echo $gcc $binutils $libc > $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"
ld="$out/bin/ld-solaris"
wrap ld-solaris ${./ld-solaris-wrapper.sh}
'')
+ ''
# Create a symlink to as (the assembler). This is useful when a
# gcc-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/ld.gold ]; then
wrap ld.gold ${./ld-wrapper.sh} $binutils/bin/ld.gold
fi
if [ -e $binutils/bin/ld.bfd ]; then
wrap ld.bfd ${./ld-wrapper.sh} $binutils/bin/ld.bfd
fi
if [ -e $gccPath/gcc ]; then
wrap gcc ${./gcc-wrapper.sh} $gccPath/gcc
ln -s gcc $out/bin/cc
elif [ -e $gccPath/clang ]; then
wrap clang ${./gcc-wrapper.sh} $gccPath/clang
ln -s clang $out/bin/cc
fi
if [ -e $gccPath/g++ ]; then
wrap g++ ${./gcc-wrapper.sh} $gccPath/g++
ln -s g++ $out/bin/c++
elif [ -e $gccPath/clang++ ]; then
wrap clang++ ${./gcc-wrapper.sh} $gccPath/clang++
ln -s clang++ $out/bin/c++
fi
if [ -e $gccPath/cpp ]; then
wrap cpp ${./gcc-wrapper.sh} $gccPath/cpp
fi
''
+ optionalString gcc.langFortran or false ''
wrap gfortran ${./gcc-wrapper.sh} $gccPath/gfortran
ln -sv gfortran $out/bin/g77
ln -sv gfortran $out/bin/f77
''
+ optionalString gcc.langJava or false ''
wrap gcj ${./gcc-wrapper.sh} $gccPath/gcj
''
+ optionalString gcc.langGo or false ''
wrap gccgo ${./gcc-wrapper.sh} $gccPath/gccgo
''
+ optionalString gcc.langAda or false ''
wrap gnatgcc ${./gcc-wrapper.sh} $gccPath/gnatgcc
wrap gnatmake ${./gnat-wrapper.sh} $gccPath/gnatmake
wrap gnatbind ${./gnat-wrapper.sh} $gccPath/gnatbind
wrap gnatlink ${./gnatlink-wrapper.sh} $gccPath/gnatlink
''
+ optionalString gcc.langVhdl or false ''
ln -s $gccPath/ghdl $out/bin/ghdl
''
+ ''
substituteAll ${./setup-hook.sh} $out/nix-support/setup-hook
substituteAll ${./add-flags} $out/nix-support/add-flags.sh
cp -p ${./utils.sh} $out/nix-support/utils.sh
if [ -e $out/bin/clang ]; then
echo 'export CC; : ''${CC:=clang}' >> $out/nix-support/setup-hook
fi
if [ -e $out/bin/clang++ ]; then
echo 'export CXX; : ''${CXX:=clang++}' >> $out/nix-support/setup-hook
fi
'';
# 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 == "powerpc-linux" then "ld.so.1" else
if stdenv.system == "mips64el-linux" then "ld.so.1" else
abort "Don't know the name of the dynamic linker for this platform.")
else "";
crossAttrs = {
shell = shell.crossDrv + shell.crossDrv.shellPath;
libc = stdenv.gccCross.libc;
coreutils = coreutils.crossDrv;
binutils = binutils.crossDrv;
gcc = gcc.crossDrv;
#
# 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 gcc_ = if gcc != null then gcc else {}; in
(if gcc_ ? meta then removeAttrs gcc.meta ["priority"] else {}) //
{ description =
stdenv.lib.attrByPath ["meta" "description"] "System C compiler" gcc_
+ " (wrapper script)";
};
}