Add PGO support to soong
Bug: http://b/63768402
Bug: http://b/65598278
Add support for the 'pgo' property to specify how a module is processed
under PGO. A sample property is below:
pgo: {
instrumentation: true, // could be "sampling: true" when supported
profile_file: "pgo_simple.profdata",
benchmarks: ["pgo_simple"],
}
1. Runtime profiles can be gathered using "sampling" or
"instrumentation". Sampling is not supported initially.
2. If 'toolchain/pgo-profiles' project is found,
'toolchain/pgo-profiles/${profile_file}' is passed to the compiler and
linker when building this module.
3. If ANDROID_PGO_INSTRUMENT environment variable is set, and includes a
benchmark in the 'benchmarks' list, appropriate flags (for e.g.
-fprofile-generate for instrumentation) are passed to the compiler and
linker when building this module.
Test: Add example modules that specify the pgo property and verify
appropriate flags and dependencies in the Ninja file. Some
tests/examples are in https://android-review.googlesource.com/474805
Change-Id: I6242e0c904497a115e367dea6927ba1c4b906355
diff --git a/cc/library.go b/cc/library.go
index 2a866dc..f1681db 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -484,6 +484,7 @@
flags Flags, deps PathDeps, objs Objects) android.Path {
var linkerDeps android.Paths
+ linkerDeps = append(linkerDeps, flags.LdFlagsDeps...)
versionScript := android.OptionalPathForModuleSrc(ctx, library.Properties.Version_script)
unexportedSymbols := android.OptionalPathForModuleSrc(ctx, library.Properties.Unexported_symbols_list)
@@ -628,7 +629,6 @@
flags Flags, deps PathDeps, objs Objects) android.Path {
objs = objs.Append(deps.Objs)
-
var out android.Path
if library.static() || library.header() {
out = library.linkStatic(ctx, flags, deps, objs)