mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-23 07:23:20 +00:00
259 lines
8.3 KiB
Bash
259 lines
8.3 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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# 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 "$@"
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linkType=$(checkLinkType "${params[@]}")
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declare -ag positionalArgs=()
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declare -i n=0
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nParams=${#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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# 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@+=" $NIX_CXXSTDLIB_LINK_@suffixSalt@"
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fi
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fi
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source @out@/nix-support/add-hardening.sh
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# Add the flags for the C compiler proper.
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extraAfter=($NIX_CFLAGS_COMPILE_@suffixSalt@)
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extraBefore=(${hardeningCFlags[@]+"${hardeningCFlags[@]}"} $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@)
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if [ "$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+=($(filterRpathFlags "$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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exec @prog@ @<(printf "%q\n" \
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${extraBefore+"${extraBefore[@]}"} \
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${params+"${params[@]}"} \
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${extraAfter+"${extraAfter[@]}"})
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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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