nixpkgs/pkgs/development/tools/clang-tools/wrapper

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#!/bin/sh
buildcpath() {
local path
while (( $# )); do
case $1 in
-isystem)
shift
path=$path${path:+':'}$1
esac
shift
done
echo $path
}
export CPATH=${CPATH}${CPATH:+':'}$(buildcpath ${NIX_CFLAGS_COMPILE})
export CPATH=${CPATH}${CPATH:+':'}@libc_includes@
export CPLUS_INCLUDE_PATH=${CPATH}${CPATH:+':'}@libcpp_includes@
exec -a "$0" @clang@/bin/$(basename $0) "$@"