From 60fc6d2897d628f24d0a4e3e95ab6f5dfe3f8b49 Mon Sep 17 00:00:00 2001
From: Jason Perkins <starkos@industriousone.com>
Date: Tue, 4 Nov 2014 18:25:32 -0500
Subject: [PATCH] New API strictaliasing() with GCC support

---
 src/_premake_init.lua    | 12 ++++++++++++
 src/tools/gcc.lua        |  6 ++++++
 tests/tools/test_gcc.lua | 29 +++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)

diff --git a/src/_premake_init.lua b/src/_premake_init.lua
index 11aadb3c..ed969b9c 100644
--- a/src/_premake_init.lua
+++ b/src/_premake_init.lua
@@ -630,6 +630,18 @@
 		tokens = true,
 	}
 
+	api.register {
+		name = "strictaliasing",
+		scope = "config",
+		kind = "string",
+		allowed = {
+			"Off",
+			"Level1",
+			"Level2",
+			"Level3",
+		}
+	}
+
 	api.register {
 		name = "system",
 		scope = "config",
diff --git a/src/tools/gcc.lua b/src/tools/gcc.lua
index 00c63ddd..1c4865aa 100644
--- a/src/tools/gcc.lua
+++ b/src/tools/gcc.lua
@@ -51,6 +51,12 @@
 				if cfg.system ~= premake.WINDOWS then return "-fPIC" end
 			end,
 		},
+		strictaliasing = {
+			Off = "-fno-strict-aliasing",
+			Level1 = { "-fstrict-aliasing", "-Wstrict-aliasing=1" },
+			Level2 = { "-fstrict-aliasing", "-Wstrict-aliasing=2" },
+			Level3 = { "-fstrict-aliasing", "-Wstrict-aliasing=3" },
+		},
 		optimize = {
 			Off = "-O0",
 			On = "-O2",
diff --git a/tests/tools/test_gcc.lua b/tests/tools/test_gcc.lua
index ec2e78af..57c0d06d 100644
--- a/tests/tools/test_gcc.lua
+++ b/tests/tools/test_gcc.lua
@@ -402,3 +402,32 @@
 		test.isequal({ '-I"$(IntDir)/includes"' }, gcc.getincludedirs(cfg, cfg.includedirs))
 	end
 
+
+
+--
+-- Check handling of strict aliasing flags.
+--
+
+	function suite.cflags_onNoStrictAliasing()
+		strictaliasing "Off"
+		prepare()
+		test.contains("-fno-strict-aliasing", gcc.getcflags(cfg))
+	end
+
+	function suite.cflags_onLevel1Aliasing()
+		strictaliasing "Level1"
+		prepare()
+		test.contains({ "-fstrict-aliasing", "-Wstrict-aliasing=1" }, gcc.getcflags(cfg))
+	end
+
+	function suite.cflags_onLevel2Aliasing()
+		strictaliasing "Level2"
+		prepare()
+		test.contains({ "-fstrict-aliasing", "-Wstrict-aliasing=2" }, gcc.getcflags(cfg))
+	end
+
+	function suite.cflags_onLevel3Aliasing()
+		strictaliasing "Level3"
+		prepare()
+		test.contains({ "-fstrict-aliasing", "-Wstrict-aliasing=3" }, gcc.getcflags(cfg))
+	end