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, 59 insertions, 0 deletions

diff --git a/compiler_wrapper/gcc_flags_test.go b/compiler_wrapper/gcc_flags_test.go
new file mode 100644
index 00000000..12119f0b
--- /dev/null
+++ b/compiler_wrapper/gcc_flags_test.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestCallRealGcc(t *testing.T) {
+	withTestContext(t, func(ctx *testContext) {
+		wrapperCmd := ctx.newCommand(gccX86_64, "-noccache", mainCc)
+		cmd := ctx.must(calcCompilerCommandAndCompareToOld(ctx, ctx.cfg, wrapperCmd))
+		if err := verifyPath(cmd, wrapperCmd.path+".real"); err != nil {
+			t.Error(err)
+		}
+	})
+}
+
+func TestCallRealGPlusPlus(t *testing.T) {
+	withTestContext(t, func(ctx *testContext) {
+		wrapperCmd := ctx.newCommand("./x86_64-cros-linux-gnu-g++", "-noccache", mainCc)
+		cmd := ctx.must(calcCompilerCommandAndCompareToOld(ctx, ctx.cfg, wrapperCmd))
+		if err := verifyPath(cmd, "\\./x86_64-cros-linux-gnu-g\\+\\+\\.real"); err != nil {
+			t.Error(err)
+		}
+	})
+}
+
+func TestConvertClangToGccFlags(t *testing.T) {
+	withTestContext(t, func(ctx *testContext) {
+		var tests = []struct {
+			in  string
+			out string
+		}{
+			{"-march=goldmont", "-march=silvermont"},
+			{"-march=goldmont-plus", "-march=silvermont"},
+			{"-march=skylake", "-march=corei7"},
+		}
+
+		for _, tt := range tests {
+			cmd := ctx.must(calcCompilerCommandAndCompareToOld(ctx, ctx.cfg,
+				ctx.newCommand(gccX86_64, tt.in, mainCc)))
+			if err := verifyArgCount(cmd, 0, tt.in); err != nil {
+				t.Error(err)
+			}
+			if err := verifyArgOrder(cmd, tt.out, mainCc); err != nil {
+				t.Error(err)
+			}
+		}
+	})
+}
+
+func TestFilterUnsupportedGccFlags(t *testing.T) {
+	withTestContext(t, func(ctx *testContext) {
+		cmd := ctx.must(calcCompilerCommandAndCompareToOld(ctx, ctx.cfg,
+			ctx.newCommand(gccX86_64, "-Xcompiler", mainCc)))
+		if err := verifyArgCount(cmd, 0, "-Xcompiler"); err != nil {
+			t.Error(err)
+		}
+	})
+}