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nixpkgs/pkgs/development/compilers/ghc/gcc-clang-wrapper.sh

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#!/bin/sh
inPreprocessorMode () {
hasE=0
hasU=0
hasT=0
for arg in "$@"
do
if [ 'x-E' = "x$arg" ]; then hasE=1; fi
if [ 'x-undef' = "x$arg" ]; then hasU=1; fi
if [ 'x-traditional' = "x$arg" ]; then hasT=1; fi
done
[ "$hasE$hasU$hasT" = '111' ]
}
extraClangArgs="-Wno-invalid-pp-token -Wno-unicode -Wno-trigraphs"
adjustPreprocessorLanguage () {
newArgs=''
while [ $# -gt 0 ]
do
newArgs="$newArgs $1"
if [ "$1" = '-x' ]
then
shift
if [ $# -gt 0 ]
then
if [ "$1" = 'c' ]
then
newArgs="$newArgs assembler-with-cpp"
else
newArgs="$newArgs $1"
fi
fi
fi
shift
done
echo $newArgs
}
if inPreprocessorMode "$@"
then
exec clang $extraClangArgs `adjustPreprocessorLanguage "$@"`
else
exec clang $extraClangArgs "${@/-nodefaultlibs/}"
fi