Separate C and C++ flags to prevent warnings while building bgfx

scripts/toolchain.lua

@@ -414,7 +414,6 @@ function toolchain(_buildDir, _libDir)
 		defines { "WIN32" }
 		includedirs { path.join(bxDir, "include/compat/mingw") }
 		buildoptions {
-			"-std=c++0x",
 			"-Wunused-value",
 			"-fdata-sections",
 			"-ffunction-sections",
@@ -422,6 +421,9 @@ function toolchain(_buildDir, _libDir)
 			"-Wunused-value",
 			"-Wundef",
 		}
+		buildoptions_cpp {
+			"-std=c++0x",
+		}
 		linkoptions {
 			"-Wl,--gc-sections",
 			"-static-libgcc",
@@ -486,11 +488,13 @@ function toolchain(_buildDir, _libDir)
 
 	configuration { "linux-*" }
 		buildoptions {
-			"-std=c++0x",
 			"-msse2",
 			"-Wunused-value",
 			"-Wundef",
 		}
+		buildoptions_cpp {
+			"-std=c++0x",
+		}		
 		links {
 			"rt",
 			"dl",
@@ -845,10 +849,12 @@ function toolchain(_buildDir, _libDir)
 			"__STDC_VERSION__=199901L",
 		}
 		buildoptions {
-			"-std=c++0x",
 			"-Wunused-value",
 			"-Wundef",
 		}
+		buildoptions_cpp {
+			"-std=c++0x",
+		}
 		includedirs {
 			"/opt/vc/include",
 			"/opt/vc/include/interface/vcos/pthreads",