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Add "-no-warn-sample-unuse=true" to work around AutoFDO issue

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Autofdo generates profile for an instruction even if there is no debug
information associated with it or no debug information associated with
the function. A bogus offset will be produced in the profile. Add the
flag to suppress Clang from generating error for such cases.

Test: build with ETM profile
Bug: 147844018
Bug: 79161490
Change-Id: I37da1ba3a4962072ccdf01f79fbf2c2b4c77b56b
This commit is contained in:
Yi Kong
2020-01-16 17:04:38 -08:00
parent a7503367cf
commit 92474e5b8f
1 changed files with 4 additions and 0 deletions
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4
cc/pgo.go
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@@ -177,6 +177,10 @@ func (props *PgoProperties) addProfileUseFlags(ctx ModuleContext, flags Flags) F
// if profileFile gets updated // if profileFile gets updated
flags.CFlagsDeps = append(flags.CFlagsDeps, profileFilePath) flags.CFlagsDeps = append(flags.CFlagsDeps, profileFilePath)
flags.LdFlagsDeps = append(flags.LdFlagsDeps, profileFilePath) flags.LdFlagsDeps = append(flags.LdFlagsDeps, profileFilePath)
if props.isSampling() {
flags.Local.LdFlags = append(flags.Local.LdFlags, "-Wl,-mllvm,-no-warn-sample-unused=true")
}
} }
return flags return flags
} }