c8e9dcc8a4
This ensures that all salted variables are defined even if the wrapped program is invoked outside nix-build environment.
88 lines
2.9 KiB
Bash
88 lines
2.9 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=(
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NIX_CC_WRAPPER+START_HOOK
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NIX_CC_WRAPPER+EXEC_HOOK
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NIX_LD_WRAPPER+START_HOOK
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NIX_LD_WRAPPER+EXEC_HOOK
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NIX+CFLAGS_COMPILE
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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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NIX+IGNORE_LD_THROUGH_GCC
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NIX+LDFLAGS
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NIX+LDFLAGS_BEFORE
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NIX+LDFLAGS_AFTER
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NIX+LDFLAGS_HARDEN
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NIX+SET_BUILD_ID
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NIX+DONT_SET_RPATH
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NIX+ENFORCE_NO_NATIVE
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)
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# Accumulate infixes for taking in the right input parameters. See setup-hook
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# for details.
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declare -a role_infixes=()
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if [ "${NIX_CC_WRAPPER_@infixSalt@_TARGET_BUILD:-}" ]; then
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role_infixes+=(_BUILD_)
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fi
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if [ "${NIX_CC_WRAPPER_@infixSalt@_TARGET_HOST:-}" ]; then
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role_infixes+=(_)
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fi
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if [ "${NIX_CC_WRAPPER_@infixSalt@_TARGET_TARGET:-}" ]; then
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role_infixes+=(_TARGET_)
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fi
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# We need to mangle names for hygiene, but also take parameters/overrides
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# from the environment.
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for var in "${var_templates[@]}"; do
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outputVar="${var/+/_@infixSalt@_}"
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export ${outputVar}+=''
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# For each role we serve, we accumulate the input parameters into our own
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# cc-wrapper-derivation-specific environment variables.
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for infix in "${role_infixes[@]}"; do
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inputVar="${var/+/${infix}}"
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if [ -v "$inputVar" ]; then
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export ${outputVar}+="${!outputVar:+ }${!inputVar}"
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fi
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done
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done
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# `-B@out@/bin' forces cc to use ld-wrapper.sh when calling ld.
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NIX_@infixSalt@_CFLAGS_COMPILE="-B@out@/bin/ $NIX_@infixSalt@_CFLAGS_COMPILE"
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# Export and assign separately in order that a failing $(..) will fail
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# the script.
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if [ -e @out@/nix-support/libc-cflags ]; then
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NIX_@infixSalt@_CFLAGS_COMPILE="$(< @out@/nix-support/libc-cflags) $NIX_@infixSalt@_CFLAGS_COMPILE"
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fi
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if [ -e @out@/nix-support/cc-cflags ]; then
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NIX_@infixSalt@_CFLAGS_COMPILE="$(< @out@/nix-support/cc-cflags) $NIX_@infixSalt@_CFLAGS_COMPILE"
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fi
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if [ -e @out@/nix-support/gnat-cflags ]; then
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NIX_@infixSalt@_GNATFLAGS_COMPILE="$(< @out@/nix-support/gnat-cflags) $NIX_@infixSalt@_GNATFLAGS_COMPILE"
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fi
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if [ -e @out@/nix-support/libc-ldflags ]; then
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NIX_@infixSalt@_LDFLAGS+=" $(< @out@/nix-support/libc-ldflags)"
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fi
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if [ -e @out@/nix-support/cc-ldflags ]; then
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NIX_@infixSalt@_LDFLAGS+=" $(< @out@/nix-support/cc-ldflags)"
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fi
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if [ -e @out@/nix-support/libc-ldflags-before ]; then
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NIX_@infixSalt@_LDFLAGS_BEFORE="$(< @out@/nix-support/libc-ldflags-before) $NIX_@infixSalt@_LDFLAGS_BEFORE"
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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_@infixSalt@_FLAGS_SET=1
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