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Bug 1644624 - Pass LLVM flags from PROFILE_GEN_CFLAGS to the rust compiler. r=firefox-build-system-reviewers,dmajor

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Differential Revision: https://phabricator.services.mozilla.com/D93729
This commit is contained in:
Mike Hommey 2020-10-20 19:29:58 +00:00
parent 6504260166
commit 0848a4e73a
1 changed files with 10 additions and 1 deletions
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11
config/makefiles/rust.mk
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@ -193,7 +193,16 @@ target_rust_ltoable := force-cargo-library-build
target_rust_nonltoable := force-cargo-test-run force-cargo-library-check $(foreach b,build check,force-cargo-program-$(b))
ifdef MOZ_PGO_RUST
rust_pgo_flags := $(if $(MOZ_PROFILE_GENERATE),-C profile-generate=$(topobjdir)) $(if $(MOZ_PROFILE_USE),-C profile-use=$(PGO_PROFILE_PATH))
ifdef MOZ_PROFILE_GENERATE
rust_pgo_flags := -C profile-generate=$(topobjdir)
# The C compiler may be passed extra llvm flags for PGO that we also want to pass to rust as well.
# In PROFILE_GEN_CFLAGS, they look like "-mllvm foo", and we want "-C llvm-args=foo", so first turn
# "-mllvm foo" into "-mllvm:foo" so that it becomes a unique argument, that we can then filter for,
# excluding other flags, and then turn into the right string.
rust_pgo_flags += $(patsubst -mllvm:%,-C llvm-args=%,$(filter -mllvm:%,$(subst -mllvm ,-mllvm:,$(PROFILE_GEN_CFLAGS))))
else # MOZ_PROFILE_USE
rust_pgo_flags := -C profile-use=$(PGO_PROFILE_PATH)
endif
endif
$(target_rust_ltoable): RUSTFLAGS:=$(rustflags_override) $(rustflags_sancov) $(RUSTFLAGS) $(if $(MOZ_LTO_RUST_CROSS),-Clinker-plugin-lto) $(rust_pgo_flags)