From: Bobby Powers <bobbypowers@gmail.com>
Date: Thu, 16 Feb 2012 18:31:46 +0000 (-0500)
Subject: dist: add clang specific -Wno options
X-Git-Tag: weekly.2012-02-22~189
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=7c2bfa4f2cd591c618353bc3099678b0db6e8750;p=gostls13.git

dist: add clang specific -Wno options

Clang 3.1 has more warnings enabled by default than GCC.
Combined with -Werror, they cause the build to fail
unnecessarily.  if the name of our compiler ends in "clang",
add the necessary extra -Wno options.  Ideally we would add
these flags unconditionally, as GCC is supposed to ignore
unknown -Wno flags, but apple's llvm-gcc doesn't.

Fixes #2878.

R=rsc, dave
CC=golang-dev
https://golang.org/cl/5673055
---

diff --git a/src/cmd/dist/build.c b/src/cmd/dist/build.c
index 9d168b364f..f31c83ea7a 100644
--- a/src/cmd/dist/build.c
+++ b/src/cmd/dist/build.c
@@ -582,8 +582,12 @@ install(char *dir)
 		splitfields(&gccargs, bstr(&b));
 		for(i=0; i<nelem(proto_gccargs); i++)
 			vadd(&gccargs, proto_gccargs[i]);
+		if(xstrstr(gccargs.p[0], "clang") != nil) {
+			vadd(&gccargs, "-Wno-dangling-else");
+			vadd(&gccargs, "-Wno-unused-value");
+		}
 	}
-	
+
 	islib = hasprefix(dir, "lib") || streq(dir, "cmd/cc") || streq(dir, "cmd/gc");
 	ispkg = hasprefix(dir, "pkg");
 	isgo = ispkg || streq(dir, "cmd/go") || streq(dir, "cmd/cgo");