tests.cc-wrapper: Run with an empty path (#349585)

  emulator = stdenv.hostPlatform.emulator buildPackages;

  isCxx = stdenv.cc.libcxx != null;

  libcxxStdenvSuffix = lib.optionalString isCxx "-libcxx";

  CC = "PATH= ${lib.getExe' stdenv.cc "${stdenv.cc.targetPrefix}cc"}";

  CXX = "PATH= ${lib.getExe' stdenv.cc "${stdenv.cc.targetPrefix}c++"}";

  READELF = "PATH= ${lib.getExe' stdenv.cc "${stdenv.cc.targetPrefix}readelf"}";

in stdenv.mkDerivation {

  pname = "cc-wrapper-test-${stdenv.cc.cc.pname}${libcxxStdenvSuffix}";

  version = stdenv.cc.version;

    echo "With libc: ${stdenv.cc.libc.name}" >&2

    set -o pipefail

    NIX_DEBUG=1 $CC -v

    NIX_DEBUG=1 $CXX -v

    NIX_DEBUG=1 ${CC} -v

    NIX_DEBUG=1 ${CXX} -v

    echo "checking whether compiler builds valid C binaries... " >&2

    $CC -o cc-check ${./cc-main.c}

    ${CC} -o cc-check ${./cc-main.c}

    ${emulator} ./cc-check

    echo "checking whether compiler builds valid C++ binaries... " >&2

    $CXX -o cxx-check ${./cxx-main.cc}

    ${CXX} -o cxx-check ${./cxx-main.cc}

    ${emulator} ./cxx-check

    # test for https://github.com/NixOS/nixpkgs/issues/214524#issuecomment-1431745905

    # .../include/cxxabi.h:20:10: fatal error: '__cxxabi_config.h' file not found

    # in libcxxStdenv

    echo "checking whether cxxabi.h can be included... " >&2

    $CXX -o include-cxxabi ${./include-cxxabi.cc}

    ${CXX} -o include-cxxabi ${./include-cxxabi.cc}

    ${emulator} ./include-cxxabi

    # cxx doesn't have libatomic.so

    ${lib.optionalString (!isCxx) ''

      # https://github.com/NixOS/nixpkgs/issues/91285

      echo "checking whether libatomic.so can be linked... " >&2

      $CXX -shared -o atomics.so ${./atomics.cc} -latomic ${lib.optionalString (stdenv.cc.isClang && lib.versionOlder stdenv.cc.version "6.0.0" ) "-std=c++17"}

      $READELF -d ./atomics.so | grep libatomic.so && echo "ok" >&2 || echo "failed" >&2

      ${CXX} -shared -o atomics.so ${./atomics.cc} -latomic ${lib.optionalString (stdenv.cc.isClang && lib.versionOlder stdenv.cc.version "6.0.0" ) "-std=c++17"}

      ${READELF} -d ./atomics.so | grep libatomic.so && echo "ok" >&2 || echo "failed" >&2

    ''}

    # Test that linking libc++ works, and statically.

    ${lib.optionalString isCxx ''

      echo "checking whether can link with libc++... " >&2

      NIX_DEBUG=1 $CXX ${./cxx-main.cc} -c -o cxx-main.o

      NIX_DEBUG=1 $CC cxx-main.o -lc++ -o cxx-main

      NIX_DEBUG=1 $CC cxx-main.o ${lib.getLib stdenv.cc.libcxx}/lib/libc++.a -o cxx-main-static

      NIX_DEBUG=1 ${CXX} ${./cxx-main.cc} -c -o cxx-main.o

      NIX_DEBUG=1 ${CC} cxx-main.o -lc++ -o cxx-main

      NIX_DEBUG=1 ${CC} cxx-main.o ${lib.getLib stdenv.cc.libcxx}/lib/libc++.a -o cxx-main-static

      ${emulator} ./cxx-main

      ${emulator} ./cxx-main-static

      rm cxx-main{,-static,.o}

    ${lib.optionalString (stdenv.hostPlatform.isDarwin && stdenv.cc.isClang) ''

      echo "checking whether compiler can build with CoreFoundation.framework... " >&2

      mkdir -p foo/lib

      $CC -framework CoreFoundation -o core-foundation-check ${./core-foundation-main.c}

      ${CC} -framework CoreFoundation -o core-foundation-check ${./core-foundation-main.c}

      ${emulator} ./core-foundation-check

    ''}

    ${lib.optionalString (!stdenv.hostPlatform.isDarwin) ''

      echo "checking whether compiler builds valid static C binaries... " >&2

      $CC ${staticLibc} -static -o cc-static ${./cc-main.c}

      ${CC} ${staticLibc} -static -o cc-static ${./cc-main.c}

      ${emulator} ./cc-static

      ${lib.optionalString (stdenv.cc.isGNU && lib.versionAtLeast (lib.getVersion stdenv.cc.name) "8.0.0") ''

        echo "checking whether compiler builds valid static pie C binaries... " >&2

        $CC ${staticLibc} -static-pie -o cc-static-pie ${./cc-main.c}

        ${CC} ${staticLibc} -static-pie -o cc-static-pie ${./cc-main.c}

        ${emulator} ./cc-static-pie

      ''}

    ''}

        # Make sure `--` is not parsed as a "non flag arg"; we should get an

        # input file error here and *not* a linker error.

        { ! $CC --; } |& grep -q "no input files"

        { ! ${CC} --; } |& grep -q "no input files"

        # And that positional file args _must_ be files (this is just testing

        # that we remembered to put the `--` back in the args to the compiler):

        { ! $CC -c -- -o foo ${./foo.c}; } \

        { ! ${CC} -c -- -o foo ${./foo.c}; } \

          |& grep -q "no such file or directory: '-o'"

        # Now check that we accept single and multiple positional file args:

        $CC -c -DVALUE=42 -o positional/foo.o -- ${./foo.c}

        $CC -o positional/main -- positional/foo.o ${./ldflags-main.c}

        ${CC} -c -DVALUE=42 -o positional/foo.o -- ${./foo.c}

        ${CC} -o positional/main -- positional/foo.o ${./ldflags-main.c}

        ${emulator} ./positional/main

    ''}

    echo "checking whether compiler uses NIX_CFLAGS_COMPILE... " >&2

    mkdir -p foo/include

    cp ${./foo.c} foo/include/foo.h

    NIX_CFLAGS_COMPILE="-Ifoo/include -DVALUE=42" $CC -o cflags-check ${./cflags-main.c}

    NIX_CFLAGS_COMPILE="-Ifoo/include -DVALUE=42" ${CC} -o cflags-check ${./cflags-main.c}

    ${emulator} ./cflags-check

    echo "checking whether compiler uses NIX_LDFLAGS... " >&2

    mkdir -p foo/lib

    $CC -shared \

    ${CC} -shared \

      ${lib.optionalString stdenv.hostPlatform.isDarwin "-Wl,-install_name,@rpath/libfoo.dylib"} \

      -DVALUE=42 \

      -o foo/lib/libfoo${stdenv.hostPlatform.extensions.sharedLibrary} \

      ${./foo.c}

    NIX_LDFLAGS="-L$NIX_BUILD_TOP/foo/lib -rpath $NIX_BUILD_TOP/foo/lib" $CC -lfoo -o ldflags-check ${./ldflags-main.c}

    NIX_LDFLAGS="-L$NIX_BUILD_TOP/foo/lib -rpath $NIX_BUILD_TOP/foo/lib" ${CC} -lfoo -o ldflags-check ${./ldflags-main.c}

    ${emulator} ./ldflags-check

    echo "Check whether -nostdinc and -nostdinc++ is handled correctly" >&2

    mkdir -p std-include

    cp ${./stdio.h} std-include/stdio.h

    NIX_DEBUG=1 $CC -I std-include -nostdinc -o nostdinc-main ${./nostdinc-main.c}

    NIX_DEBUG=1 ${CC} -I std-include -nostdinc -o nostdinc-main ${./nostdinc-main.c}

    ${emulator} ./nostdinc-main

    $CXX -I std-include -nostdinc++ -o nostdinc-main++ ${./nostdinc-main.c}

    ${CXX} -I std-include -nostdinc++ -o nostdinc-main++ ${./nostdinc-main.c}

    ${emulator} ./nostdinc-main++

    ${lib.optionalString sanitizersWorking ''

      echo "checking whether sanitizers are fully functional... ">&2

      $CC -o sanitizers -fsanitize=address,undefined ${./sanitizers.c}

      ${CC} -o sanitizers -fsanitize=address,undefined ${./sanitizers.c}

      ASAN_OPTIONS=use_sigaltstack=0 ${emulator} ./sanitizers

    ''}

        (filter (lib.hasPrefix "gcc"))

        (filter (lib.hasSuffix "Stdenv"))

        (filter (n: n != "gccCrossLibcStdenv"))

        (filter (n: n != "gcc49Stdenv"))

        (filter (n: n != "gcc6Stdenv"))

      ] ++ lib.optionals (!(

        (stdenv.buildPlatform.isLinux && stdenv.buildPlatform.isx86_64) &&

        (stdenv.hostPlatform.isLinux && stdenv.hostPlatform.isx86_64)