mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-21 21:21:06 +00:00
88 lines
2.7 KiB
Bash
88 lines
2.7 KiB
Bash
source $stdenv/setup
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export NIX_FIXINC_DUMMY=$NIX_BUILD_TOP/dummy
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mkdir $NIX_FIXINC_DUMMY
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# libstdc++ needs this; otherwise it will use /lib/cpp, which is a Bad
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# Thing.
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export CPP="gcc -E"
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if test "$noSysDirs" = "1"; then
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# Figure out what extra flags to pass to the gcc compilers being
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# generated to make sure that they use our glibc.
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if test -e $NIX_GCC/nix-support/orig-glibc; then
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glibc=$(cat $NIX_GCC/nix-support/orig-glibc)
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# Ugh. Copied from gcc-wrapper/builder.sh. We can't just
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# source in $NIX_GCC/nix-support/add-flags, since that would
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# cause *this* GCC to be linked against the *previous* GCC.
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# Need some more modularity there.
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extraCFlags="-B$glibc/lib -isystem $glibc/include"
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extraLDFlags="-B$glibc/lib -L$glibc/lib -Wl,-s \
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-Wl,-dynamic-linker,$glibc/lib/ld-linux.so.2"
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# Oh, what a hack. I should be shot for this. In stage 1, we
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# should link against the previous GCC, but not afterwards.
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# Otherwise we retain a dependency. However, ld-wrapper,
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# which adds the linker flags for the previous GCC, is also
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# used in stage 2/3. We can prevent it from adding them by
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# NIX_GLIBC_FLAGS_SET, but then gcc-wrapper will also not add
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# them, thereby causing stage 1 to fail. So we use a trick to
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# only set the flags in gcc-wrapper.
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hook=$(pwd)/ld-wrapper-hook
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echo "NIX_GLIBC_FLAGS_SET=1" > $hook
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export NIX_LD_WRAPPER_START_HOOK=$hook
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# Use *real* header files, otherwise a limits.h is generated
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# that does not include Glibc's limits.h (notably missing
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# SSIZE_MAX, which breaks the build).
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export NIX_FIXINC_DUMMY=$glibc/include
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fi
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export NIX_EXTRA_CFLAGS=$extraCFlags
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export NIX_EXTRA_LDFLAGS=$extraLDFlags
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export CFLAGS=$extraCFlags
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export CXXFLAGS=$extraCFlags
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export LDFLAGS=$extraLDFlags
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fi
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preConfigure=preConfigure
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preConfigure() {
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# Determine the frontends to build.
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langs="c"
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if test -n "$langCC"; then
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langs="$langs,c++"
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fi
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if test -n "$langF77"; then
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langs="$langs,f77"
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fi
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# Perform the build in a different directory.
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mkdir ../build
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cd ../build
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configureScript=../$sourceRoot/configure
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configureFlags="--enable-languages=$langs --disable-libstdcxx-pch"
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}
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postInstall=postInstall
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postInstall() {
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# Remove precompiled headers for now. They are very big and
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# probably not very useful yet.
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find $out/include -name "*.gch" -exec rm -rf {} \; -prune
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# Remove `fixincl' to prevent a retained dependency on the
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# previous gcc.
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rm -rf $out/libexec/gcc/*/*/install-tools
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}
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genericBuild
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