156 lines
4.9 KiB
Bash
156 lines
4.9 KiB
Bash
#! @shell@ -e
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if test -n "$NIX_CLANG_WRAPPER_START_HOOK"; then
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source "$NIX_CLANG_WRAPPER_START_HOOK"
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fi
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if test -z "$NIX_CLANG_WRAPPER_FLAGS_SET"; then
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source @out@/nix-support/add-flags.sh
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fi
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source @out@/nix-support/utils.sh
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# Figure out if linker flags should be passed. Clang prints annoying
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# warnings when they are not needed. (does it really? Copied from gcc-wrapper)
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dontLink=0
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getVersion=0
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nonFlagArgs=0
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for i in "$@"; do
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if test "$i" = "-c"; then
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dontLink=1
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elif test "$i" = "-S"; then
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dontLink=1
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elif test "$i" = "-E"; then
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dontLink=1
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elif test "$i" = "-E"; then
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dontLink=1
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elif test "$i" = "-M"; then
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dontLink=1
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elif test "$i" = "-MM"; then
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dontLink=1
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elif test "$i" = "-x"; then
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# At least for the cases c-header or c++-header we should set dontLink.
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# I expect no one use -x other than making precompiled headers.
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dontLink=1
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elif test "${i:0:1}" != "-"; then
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nonFlagArgs=1
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elif test "$i" = "-m32"; then
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if test -e @out@/nix-support/dynamic-linker-m32; then
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NIX_LDFLAGS="$NIX_LDFLAGS -dynamic-linker $(cat @out@/nix-support/dynamic-linker-m32)"
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fi
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fi
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done
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# If we pass a flag like -Wl, then clang will call the linker unless it
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# can figure out that it has to do something else (e.g., because of a
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# "-c" flag). So if no non-flag arguments are given, don't pass any
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# linker flags. This catches cases like "clang" (should just print
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# "clang: no input files") and "clang -v" (should print the version).
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if test "$nonFlagArgs" = "0"; then
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dontLink=1
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fi
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# Optionally filter out paths not refering to the store.
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params=("$@")
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if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
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rest=()
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n=0
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while test $n -lt ${#params[*]}; do
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p=${params[n]}
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p2=${params[$((n+1))]}
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if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
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skip $p
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elif test "$p" = "-L" && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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elif test "${p:0:3}" = "-I/" && badPath "${p:2}"; then
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skip $p
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elif test "$p" = "-I" && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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elif test "$p" = "-isystem" && badPath "$p2"; then
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n=$((n + 1)); skip $p2
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else
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rest=("${rest[@]}" "$p")
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fi
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n=$((n + 1))
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done
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params=("${rest[@]}")
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fi
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if test -n "@libcxx@"; then
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NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem@libcxx@/include/c++/v1 -stdlib=libc++"
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NIX_CFLAGS_LINK="$NIX_CFLAGS_LINK -L@libcxx@/lib -stdlib=libc++ -lc++abi"
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fi
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# Add the flags for the C compiler proper.
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extraAfter=($NIX_CFLAGS_COMPILE)
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extraBefore=()
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if test "$dontLink" != "1"; then
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# Add the flags that should only be passed to the compiler when
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# linking.
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extraAfter=(${extraAfter[@]} $NIX_CFLAGS_LINK)
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# Add the flags that should be passed to the linker (and prevent
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# `ld-wrapper' from adding NIX_LDFLAGS again).
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for i in $NIX_LDFLAGS_BEFORE; do
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extraBefore=(${extraBefore[@]} "-Wl,$i")
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done
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for i in $NIX_LDFLAGS; do
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if test "${i:0:3}" = "-L/"; then
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extraAfter=(${extraAfter[@]} "$i")
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else
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extraAfter=(${extraAfter[@]} "-Wl,$i")
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fi
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done
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export NIX_LDFLAGS_SET=1
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fi
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# As a very special hack, if the arguments are just `-v', then don't
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# add anything. This is to prevent `clang -v' (which normally prints
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# out the version number and returns exit code 0) from printing out
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# `No input files specified' and returning exit code 1.
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if test "$*" = "-v"; then
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extraAfter=()
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extraBefore=()
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fi
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# Optionally print debug info.
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if test "$NIX_DEBUG" = "1"; then
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echo "original flags to @clangProg@:" >&2
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for i in "${params[@]}"; do
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echo " $i" >&2
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done
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echo "extraBefore flags to @clangProg@:" >&2
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for i in ${extraBefore[@]}; do
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echo " $i" >&2
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done
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echo "extraAfter flags to @clangProg@:" >&2
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for i in ${extraAfter[@]}; do
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echo " $i" >&2
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done
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fi
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if test -n "$NIX_CLANG_WRAPPER_EXEC_HOOK"; then
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source "$NIX_CLANG_WRAPPER_EXEC_HOOK"
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fi
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# We nuke LD_LIBRARY_PATH here, because clang dynamically links to LLVM.
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# Unfortunately, when such clang is used to build LLVM again, it can get in
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# trouble temporarily binding to the build-directory versions of the libraries
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# (the buildsystem sets LD_LIBRARY_PATH). That is very undesirable and can
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# cause mysterious failures.
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LD_LIBRARY_PATH=
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# Call the real `clang'. Filter out warnings from stderr about unused
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# `-B' flags, since they confuse some programs. Deep bash magic to
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# apply grep to stderr (by swapping stdin/stderr twice).
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if test -z "$NIX_CLANG_NEEDS_GREP"; then
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@clangProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]}
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else
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(@clangProg@ ${extraBefore[@]} "${params[@]}" ${extraAfter[@]} 3>&2 2>&1 1>&3- \
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| (grep -v 'file path prefix' || true); exit ${PIPESTATUS[0]}) 3>&2 2>&1 1>&3-
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exit $?
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fi
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