mirror of
https://github.com/NixOS/nixpkgs.git
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9142a07030
This reduces code duplication, makes the SDK variables available earlier in the wrappers, and makes the behaviour between the two wrappers more consistent.
269 lines
8.7 KiB
Bash
269 lines
8.7 KiB
Bash
#! @shell@
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set -eu -o pipefail +o posix
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shopt -s nullglob
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if (( "${NIX_DEBUG:-0}" >= 7 )); then
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set -x
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fi
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path_backup="$PATH"
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# That @-vars are substituted separately from bash evaluation makes
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# shellcheck think this, and others like it, are useless conditionals.
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# shellcheck disable=SC2157
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if [[ -n "@coreutils_bin@" && -n "@gnugrep_bin@" ]]; then
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PATH="@coreutils_bin@/bin:@gnugrep_bin@/bin"
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fi
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source @out@/nix-support/utils.bash
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source @out@/nix-support/darwin-sdk-setup.bash
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# Parse command line options and set several variables.
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# For instance, figure out if linker flags should be passed.
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# GCC prints annoying warnings when they are not needed.
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dontLink=0
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nonFlagArgs=0
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cc1=0
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# shellcheck disable=SC2193
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[[ "@prog@" = *++ ]] && isCxx=1 || isCxx=0
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cxxInclude=1
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cxxLibrary=1
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cInclude=1
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expandResponseParams "$@"
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declare -ag positionalArgs=()
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declare -i n=0
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nParams=${#params[@]}
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while (( "$n" < "$nParams" )); do
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p=${params[n]}
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p2=${params[n+1]:-} # handle `p` being last one
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n+=1
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case "$p" in
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-[cSEM] | -MM) dontLink=1 ;;
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-cc1) cc1=1 ;;
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-nostdinc) cInclude=0 cxxInclude=0 ;;
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-nostdinc++) cxxInclude=0 ;;
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-nostdlib) cxxLibrary=0 ;;
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-x*-header) dontLink=1 ;; # both `-x c-header` and `-xc-header` are accepted by clang
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-xc++*) isCxx=1 ;; # both `-xc++` and `-x c++` are accepted by clang
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-x)
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case "$p2" in
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*-header) dontLink=1 ;;
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c++*) isCxx=1 ;;
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esac
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;;
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--) # Everything else is positional args!
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# See: https://github.com/llvm/llvm-project/commit/ed1d07282cc9d8e4c25d585e03e5c8a1b6f63a74
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# Any positional arg (i.e. any argument after `--`) will be
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# interpreted as a "non flag" arg:
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if [[ -v "params[$n]" ]]; then nonFlagArgs=1; fi
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positionalArgs=("${params[@]:$n}")
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params=("${params[@]:0:$((n - 1))}")
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break;
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;;
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-?*) ;;
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*) nonFlagArgs=1 ;; # Includes a solitary dash (`-`) which signifies standard input; it is not a flag
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esac
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done
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# If we pass a flag like -Wl, then gcc will call the linker unless it
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# can figure out that it has to do something else (e.g., because of a
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# "-c" flag). So if no non-flag arguments are given, don't pass any
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# linker flags. This catches cases like "gcc" (should just print
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# "gcc: no input files") and "gcc -v" (should print the version).
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if [ "$nonFlagArgs" = 0 ]; then
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dontLink=1
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fi
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# Arocc does not link
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if [ "@isArocc@" = 1 ]; 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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if [[ "${NIX_ENFORCE_PURITY:-}" = 1 && -n "$NIX_STORE" ]]; then
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kept=()
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nParams=${#params[@]}
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declare -i n=0
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while (( "$n" < "$nParams" )); do
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p=${params[n]}
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p2=${params[n+1]:-} # handle `p` being last one
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n+=1
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skipNext=false
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path=""
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case "$p" in
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-[IL]/*) path=${p:2} ;;
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-[IL] | -isystem) path=$p2 skipNext=true ;;
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esac
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if [[ -n $path ]] && badPath "$path"; then
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skip "$path"
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$skipNext && n+=1
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continue
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fi
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kept+=("$p")
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done
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# Old bash empty array hack
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params=(${kept+"${kept[@]}"})
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fi
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# Flirting with a layer violation here.
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if [ -z "${NIX_BINTOOLS_WRAPPER_FLAGS_SET_@suffixSalt@:-}" ]; then
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source @bintools@/nix-support/add-flags.sh
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fi
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# Put this one second so libc ldflags take priority.
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if [ -z "${NIX_CC_WRAPPER_FLAGS_SET_@suffixSalt@:-}" ]; then
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source @out@/nix-support/add-flags.sh
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fi
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# Clear march/mtune=native -- they bring impurity.
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if [ "$NIX_ENFORCE_NO_NATIVE_@suffixSalt@" = 1 ]; then
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kept=()
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# Old bash empty array hack
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for p in ${params+"${params[@]}"}; do
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if [[ "$p" = -m*=native ]]; then
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skip "$p"
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else
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kept+=("$p")
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fi
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done
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# Old bash empty array hack
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params=(${kept+"${kept[@]}"})
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fi
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if [[ "$isCxx" = 1 ]]; then
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if [[ "$cxxInclude" = 1 ]]; then
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#
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# The motivation for this comment is to explain the reason for appending
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# the C++ stdlib to NIX_CFLAGS_COMPILE, which I initially thought should
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# change and later realized it shouldn't in:
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#
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# https://github.com/NixOS/nixpkgs/pull/185569#issuecomment-1234959249
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#
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# NIX_CFLAGS_COMPILE contains dependencies added using "-isystem", and
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# NIX_CXXSTDLIB_COMPILE adds the C++ stdlib using "-isystem". Appending
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# NIX_CXXSTDLIB_COMPILE to NIX_CLAGS_COMPILE emulates this part of the
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# include lookup order from GCC/Clang:
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#
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# > 4. Directories specified with -isystem options are scanned in
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# > left-to-right order.
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# > 5. Standard system directories are scanned.
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# > 6. Directories specified with -idirafter options are scanned
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# > in left-to-right order.
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#
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# NIX_CXX_STDLIB_COMPILE acts as the "standard system directories" that
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# are otherwise missing from CC in nixpkgs, so should be added last.
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#
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# This means that the C standard library should never be present inside
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# NIX_CFLAGS_COMPILE, because it MUST come after the C++ stdlib. It is
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# added automatically by cc-wrapper later using "-idirafter".
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#
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NIX_CFLAGS_COMPILE_@suffixSalt@+=" $NIX_CXXSTDLIB_COMPILE_@suffixSalt@"
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fi
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if [[ "$cxxLibrary" = 1 ]]; then
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NIX_CFLAGS_LINK_@suffixSalt@+=" $NIX_CXXSTDLIB_LINK_@suffixSalt@"
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fi
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fi
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source @out@/nix-support/add-hardening.sh
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# Add the flags for the C compiler proper.
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extraAfter=(${hardeningCFlagsAfter[@]+"${hardeningCFlagsAfter[@]}"} $NIX_CFLAGS_COMPILE_@suffixSalt@)
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extraBefore=(${hardeningCFlagsBefore[@]+"${hardeningCFlagsBefore[@]}"} $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@)
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if [ "$dontLink" != 1 ]; then
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linkType=$(checkLinkType $NIX_LDFLAGS_BEFORE_@suffixSalt@ "${params[@]}" ${NIX_CFLAGS_LINK_@suffixSalt@:-} $NIX_LDFLAGS_@suffixSalt@)
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# Add the flags that should only be passed to the compiler when
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# linking.
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extraAfter+=($(filterRpathFlags "$linkType" $NIX_CFLAGS_LINK_@suffixSalt@))
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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_@suffixSalt@ again).
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for i in $(filterRpathFlags "$linkType" $NIX_LDFLAGS_BEFORE_@suffixSalt@); do
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extraBefore+=("-Wl,$i")
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done
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if [[ "$linkType" == dynamic && -n "$NIX_DYNAMIC_LINKER_@suffixSalt@" ]]; then
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extraBefore+=("-Wl,-dynamic-linker=$NIX_DYNAMIC_LINKER_@suffixSalt@")
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fi
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for i in $(filterRpathFlags "$linkType" $NIX_LDFLAGS_@suffixSalt@); do
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if [ "${i:0:3}" = -L/ ]; then
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extraAfter+=("$i")
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else
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extraAfter+=("-Wl,$i")
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fi
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done
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export NIX_LINK_TYPE_@suffixSalt@=$linkType
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fi
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if [[ -e @out@/nix-support/add-local-cc-cflags-before.sh ]]; then
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source @out@/nix-support/add-local-cc-cflags-before.sh
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fi
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# As a very special hack, if the arguments are just `-v', then don't
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# add anything. This is to prevent `gcc -v' (which normally prints
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# out the version number and returns exit code 0) from printing out
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# `No input files specified' and returning exit code 1.
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if [ "$*" = -v ]; then
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extraAfter=()
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extraBefore=()
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fi
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# clang's -cc1 mode is not compatible with most options
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# that we would pass. Rather than trying to pass only
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# options that would work, let's just remove all of them.
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if [ "$cc1" = 1 ]; then
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extraAfter=()
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extraBefore=()
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fi
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# Finally, if we got any positional args, append them to `extraAfter`
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# now:
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if [[ "${#positionalArgs[@]}" -gt 0 ]]; then
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extraAfter+=(-- "${positionalArgs[@]}")
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fi
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# Optionally print debug info.
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if (( "${NIX_DEBUG:-0}" >= 1 )); then
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# Old bash workaround, see ld-wrapper for explanation.
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echo "extra flags before to @prog@:" >&2
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printf " %q\n" ${extraBefore+"${extraBefore[@]}"} >&2
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echo "original flags to @prog@:" >&2
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printf " %q\n" ${params+"${params[@]}"} >&2
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echo "extra flags after to @prog@:" >&2
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printf " %q\n" ${extraAfter+"${extraAfter[@]}"} >&2
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fi
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PATH="$path_backup"
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# Old bash workaround, see above.
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# if a cc-wrapper-hook exists, run it.
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if [[ -e @out@/nix-support/cc-wrapper-hook ]]; then
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compiler=@prog@
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source @out@/nix-support/cc-wrapper-hook
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fi
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if (( "${NIX_CC_USE_RESPONSE_FILE:-@use_response_file_by_default@}" >= 1 )); then
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responseFile=$(@mktemp@ "${TMPDIR:-/tmp}/cc-params.XXXXXX")
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trap '@rm@ -f -- "$responseFile"' EXIT
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printf "%q\n" \
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${extraBefore+"${extraBefore[@]}"} \
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${params+"${params[@]}"} \
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${extraAfter+"${extraAfter[@]}"} > "$responseFile"
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@prog@ "@$responseFile"
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else
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exec @prog@ \
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${extraBefore+"${extraBefore[@]}"} \
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${params+"${params[@]}"} \
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${extraAfter+"${extraAfter[@]}"}
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fi
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