Initial version of a go version of the compiler wrapper.

Still calls the old wrapper if one of the following flags is given:
- Xclang-path
- clang-syntax
- env WITH_TIDY
- env FORCE_DISABLE_WERROR
- env GETRUSAGE
- env BISECT_STAGE

BUG=chromium:773875
TEST=Unit tests that also verify the produced command against the
TEST=existing compiler wrapper.

Change-Id: I1e0a720ce9f485d8015deefb2682f2cb760d82e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1652057
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Tobias Bosch <tbosch@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Tobias Bosch <tbosch@google.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/compiler_wrapper/sanitizer_flags.go b/compiler_wrapper/sanitizer_flags.go
new file mode 100644
index 00000000..de4f76c4
--- /dev/null
+++ b/compiler_wrapper/sanitizer_flags.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"strings"
+)
+
+func processSanitizerFlags(builder *commandBuilder) {
+	filterSanitizerFlags := false
+	for _, arg := range builder.args {
+		// TODO: This should probably be -fsanitize= to not match on
+		// e.g. -fsanitize-blacklist
+		if arg.FromUser && strings.HasPrefix(arg.Value, "-fsanitize") {
+			filterSanitizerFlags = true
+			break
+		}
+	}
+	if filterSanitizerFlags {
+		// Flags not supported by sanitizers (ASan etc.)
+		var unsupportedSanitizerFlags = map[string]bool{
+			"-D_FORTIFY_SOURCE=1": true,
+			"-D_FORTIFY_SOURCE=2": true,
+			"-Wl,--no-undefined":  true,
+			"-Wl,-z,defs":         true,
+		}
+
+		builder.transformArgs(func(arg builderArg) string {
+			if unsupportedSanitizerFlags[arg.Value] {
+				return ""
+			}
+			return arg.Value
+		})
+	}
+}