1 files changed, 104 insertions, 0 deletions
diff --git a/cc/clang.go b/cc/clang.go
new file mode 100644
index 000000000..c348eeac4
--- /dev/null
+++ b/cc/clang.go
@@ -0,0 +1,104 @@
+package cc
+
+import (
+	"sort"
+	"strings"
+)
+
+// Cflags that should be filtered out when compiling with clang
+var clangUnknownCflags = []string{
+	"-finline-functions",
+	"-finline-limit=64",
+	"-fno-canonical-system-headers",
+	"-fno-tree-sra",
+	"-funswitch-loops",
+	"-Wmaybe-uninitialized",
+	"-Wno-error=maybe-uninitialized",
+	"-Wno-free-nonheap-object",
+	"-Wno-literal-suffix",
+	"-Wno-maybe-uninitialized",
+	"-Wno-old-style-declaration",
+	"-Wno-psabi",
+	"-Wno-unused-but-set-variable",
+	"-Wno-unused-but-set-parameter",
+	"-Wno-unused-local-typedefs",
+
+	// arm + arm64 + mips + mips64
+	"-fgcse-after-reload",
+	"-frerun-cse-after-loop",
+	"-frename-registers",
+	"-fno-strict-volatile-bitfields",
+
+	// arm + arm64
+	"-fno-align-jumps",
+	"-Wa,--noexecstack",
+
+	// arm
+	"-mthumb-interwork",
+	"-fno-builtin-sin",
+	"-fno-caller-saves",
+	"-fno-early-inlining",
+	"-fno-move-loop-invariants",
+	"-fno-partial-inlining",
+	"-fno-tree-copy-prop",
+	"-fno-tree-loop-optimize",
+
+	// mips + mips64
+	"-msynci",
+	"-mno-fused-madd",
+
+	// x86 + x86_64
+	"-finline-limit=300",
+	"-fno-inline-functions-called-once",
+	"-mfpmath=sse",
+	"-mbionic",
+}
+
+func init() {
+	sort.Strings(clangUnknownCflags)
+
+	pctx.StaticVariable("clangExtraCflags", strings.Join([]string{
+		"-D__compiler_offsetof=__builtin_offsetof",
+
+		// Help catch common 32/64-bit errors.
+		"-Werror=int-conversion",
+
+		// Workaround for ccache with clang.
+		// See http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html.
+		"-Wno-unused-command-line-argument",
+
+		// Disable -Winconsistent-missing-override until we can clean up the existing
+		// codebase for it.
+		"-Wno-inconsistent-missing-override",
+	}, " "))
+
+	pctx.StaticVariable("clangExtraConlyflags", strings.Join([]string{
+		"-std=gnu99",
+	}, " "))
+
+	pctx.StaticVariable("clangExtraTargetCflags", strings.Join([]string{
+		"-nostdlibinc",
+	}, " "))
+}
+
+func clangFilterUnknownCflags(cflags []string) []string {
+	ret := make([]string, 0, len(cflags))
+	for _, f := range cflags {
+		if !inListSorted(f, clangUnknownCflags) {
+			ret = append(ret, f)
+		}
+	}
+
+	return ret
+}
+
+func inListSorted(s string, list []string) bool {
+	for _, l := range list {
+		if s == l {
+			return true
+		} else if s < l {
+			return false
+		}
+	}
+	return false
+}