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Add -instcombine-lower-dbg-declare to hwasan flags.

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This is a workaround to improve hwasan reports involving stack
variables.

Bug: 112437883
Test: SANITIZE_TARGET=hwaddress, build and boot

Change-Id: I21ea2fdd2d1f04e2bb9b9847785c00a951030c74
This commit is contained in:
Evgenii Stepanov
2019-11-22 18:37:10 -08:00
parent 3ea15b5a72
commit 64bee4decf
1 changed files with 10 additions and 1 deletions
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11
cc/sanitize.go
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@@ -39,7 +39,16 @@ var (
hwasanCflags = []string{"-fno-omit-frame-pointer", "-Wno-frame-larger-than=",
"-fsanitize-hwaddress-abi=platform",
"-fno-experimental-new-pass-manager"}
"-fno-experimental-new-pass-manager",
// The following improves debug location information
// availability at the cost of its accuracy. It increases
// the likelihood of a stack variable's frame offset
// to be recorded in the debug info, which is important
// for the quality of hwasan reports. The downside is a
// higher number of "optimized out" stack variables.
// b/112437883.
"-mllvm", "-instcombine-lower-dbg-declare=0",
}
cfiCflags = []string{"-flto", "-fsanitize-cfi-cross-dso",
"-fsanitize-blacklist=external/compiler-rt/lib/cfi/cfi_blacklist.txt"}