Support coverage instrumentation for Linux host

Bug: http://b/77792074

- Add the libclang_rt.profile runtime libraries directly to the compile
command (for both host and target) instead of relying on the Clang
driver.
- Move the coverage mutator to PreDepsMutators so the mutation has
already happened when runtime libraries are added during dependence
computation.
- Factor out cc/config/toolchain to identify libclang_rt.profile modules
for the x86 and x86_64 host.

Test: make NATIVE_COVERAGE=true produces coverage-enabled host binaries.
Change-Id: I1ebc8cffdf11622bfc18199a57674672888b3a5f

1 files changed, 7 insertions, 3 deletions

diff --git a/cc/coverage.go b/cc/coverage.go
index 391b1181..671353c9 100644
--- a/cc/coverage.go
+++ b/cc/coverage.go
@@ -16,6 +16,7 @@ package cc
 
 import (
 	"android/soong/android"
+	"android/soong/cc/config"
 )
 
 type CoverageProperties struct {
@@ -38,6 +39,10 @@ func (cov *coverage) props() []interface{} {
 func (cov *coverage) begin(ctx BaseModuleContext) {}
 
 func (cov *coverage) deps(ctx BaseModuleContext, deps Deps) Deps {
+	if cov.Properties.CoverageEnabled {
+		runtimeLibrary := config.ProfileRuntimeLibrary(ctx.toolchain())
+		deps.LateStaticLibs = append(deps.LateStaticLibs, runtimeLibrary)
+	}
 	return deps
 }
 
@@ -99,9 +104,8 @@ func coverageLinkingMutator(mctx android.BottomUpMutatorContext) {
 
 		if !mctx.DeviceConfig().NativeCoverageEnabled() {
 			// Coverage is disabled globally
-		} else if mctx.Host() {
-			// TODO(dwillemsen): because of -nodefaultlibs, we must depend on libclang_rt.profile-*.a
-			// Just turn off for now.
+		} else if mctx.Darwin() || mctx.Windows() {
+			// Coverage not supported for Darwin and Windows
 		} else if c.coverage.Properties.Native_coverage != nil {
 			enabled = *c.coverage.Properties.Native_coverage
 		} else {