ac2c00e10f
Passing --with-ld causes problems when injecting a custom linker wrapper (similar to useMoldLinker) because it causes collect2 to check the --with-ld path (which is a hardcoded path to the standard linker wrapper) before $PATH, whereas with custom linker wrappers we want gcc to search $PATH. Because binutils-wrapper is not guaranteed to be present in $PATH, prepend it to $PATH in cc-wrapper. I verified that -print-prog-name=ld still prints an appropriate value. For example, when cross compiling for x86_64 on an aarch64 machine, the following is printed by the util-linux configure script (which uses -print-prog-name=ld [1]): checking for ld used by x86_64-unknown-linux-gnu-gcc... x86_64-unknown-linux-gnu-ld We still pass --with-as because the gcc spec file relies on this to find the assembler. This is probably fine for now as it is less common to want to override the assembler than the linker. [1] https://sources.debian.org/src/util-linux/2.41-4/m4/lib-ld.m4/?hl=59#L59
90 lines
3.5 KiB
Bash
90 lines
3.5 KiB
Bash
# N.B. It may be a surprise that the derivation-specific variables are exported,
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# since this is just sourced by the wrapped binaries---the end consumers. This
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# is because one wrapper binary may invoke another (e.g. cc invoking ld). In
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# that case, it is cheaper/better to not repeat this step and let the forked
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# wrapped binary just inherit the work of the forker's wrapper script.
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var_templates_list=(
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NIX_CFLAGS_COMPILE
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NIX_CFLAGS_COMPILE_BEFORE
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NIX_CFLAGS_LINK
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NIX_CXXSTDLIB_COMPILE
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NIX_CXXSTDLIB_LINK
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NIX_GNATFLAGS_COMPILE
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)
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var_templates_bool=(
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NIX_ENFORCE_NO_NATIVE
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)
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accumulateRoles
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# We need to mangle names for hygiene, but also take parameters/overrides
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# from the environment.
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for var in "${var_templates_list[@]}"; do
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mangleVarList "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
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done
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for var in "${var_templates_bool[@]}"; do
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mangleVarBool "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
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done
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# Prepending `@bintools@/bin' to $PATH forces cc to use ld-wrapper.sh when calling ld.
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# $path_backup is where cc-wrapper.sh stores the $PATH that will be used for the
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# compiler invocation.
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path_backup="@bintools@/bin:$path_backup"
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# Export and assign separately in order that a failing $(..) will fail
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# the script.
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# Currently bootstrap-tools does not split glibc, and gcc files into
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# separate directories. As a workaround we want resulting cflags to be
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# ordered as: crt1-cflags libc-cflags cc-cflags. Otherwise we mix crt/libc.so
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# from different libc as seen in
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# https://github.com/NixOS/nixpkgs/issues/158042
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#
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# Note that below has reverse ordering as we prepend flags one-by-one.
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# Once bootstrap-tools is split into different directories we can stop
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# relying on flag ordering below.
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if [ -e @out@/nix-support/cc-cflags ]; then
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NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/cc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
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fi
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if [[ "$cInclude" = 1 ]] && [ -e @out@/nix-support/libc-cflags ]; then
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NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
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fi
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if [ -e @out@/nix-support/libc-crt1-cflags ]; then
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NIX_CFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/libc-crt1-cflags) $NIX_CFLAGS_COMPILE_@suffixSalt@"
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fi
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if [ -e @out@/nix-support/libcxx-cxxflags ]; then
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NIX_CXXSTDLIB_COMPILE_@suffixSalt@+=" $(< @out@/nix-support/libcxx-cxxflags)"
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fi
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if [ -e @out@/nix-support/libcxx-ldflags ]; then
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NIX_CXXSTDLIB_LINK_@suffixSalt@+=" $(< @out@/nix-support/libcxx-ldflags)"
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fi
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if [ -e @out@/nix-support/gnat-cflags ]; then
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NIX_GNATFLAGS_COMPILE_@suffixSalt@="$(< @out@/nix-support/gnat-cflags) $NIX_GNATFLAGS_COMPILE_@suffixSalt@"
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fi
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if [ -e @out@/nix-support/cc-ldflags ]; then
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NIX_LDFLAGS_@suffixSalt@+=" $(< @out@/nix-support/cc-ldflags)"
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fi
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if [ -e @out@/nix-support/cc-cflags-before ]; then
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NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="$(< @out@/nix-support/cc-cflags-before) $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
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fi
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# Only add darwin min version flag if a default darwin min version is set,
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# which is a signal that we're targetting darwin.
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if [ "@darwinMinVersion@" ]; then
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mangleVarSingle @darwinMinVersionVariable@ ${role_suffixes[@]+"${role_suffixes[@]}"}
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NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@="-m@darwinPlatformForCC@-version-min=${@darwinMinVersionVariable@_@suffixSalt@:-@darwinMinVersion@} $NIX_CFLAGS_COMPILE_BEFORE_@suffixSalt@"
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fi
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# That way forked processes will not extend these environment variables again.
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export NIX_CC_WRAPPER_FLAGS_SET_@suffixSalt@=1
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