On Sun, Mar 18, 2018 at 09:18:34AM +0100, Nguyễn Thái Ngọc Duy wrote:
> The set of extra warnings we enable when DEVELOPER has to be
> conservative because we can't assume any compiler version the
> developer may use. Detect the compiler version so we know when it's
> safe to enable -Wextra and maybe more.
>
> Helped-by: Jeff King <peff@xxxxxxxx>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
> ---
> diff --git a/detect-compiler b/detect-compiler
> --- /dev/null
> +++ b/detect-compiler
> @@ -0,0 +1,50 @@
> +get_version_line() {
> + "$CC" -v 2>&1 | grep ' version '
> +}
On MacOS, "cc -v" output is:
--- >8 ---
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin16.7.0
Thread model: posix
InstalledDir: ...
--- >8 ---
> +get_family() {
> + get_version_line | sed 's/^\(.*\) version [0-9][^ ]* .*/\1/'
> +}
So, this returns "Apple LLVM".
> +case "$(get_family)" in
> +gcc)
> + print_flags gcc
> + ;;
> +*clang)
> + print_flags clang
> + ;;
> +"FreeBSD clang")
> + print_flags clang
> + ;;
> +*)
> + : unknown compiler family
> + ;;
> +esac
Which means you probably want to squash in:
--- >8 ---
diff --git a/detect-compiler b/detect-compiler
index bc2ea39ef5..3140416b40 100755
--- a/detect-compiler
+++ b/detect-compiler
@@ -41,6 +41,9 @@ gcc)
*clang)
print_flags clang
;;
+"Apple LLVM")
+ print_flags clang
+ ;;
"FreeBSD clang")
print_flags clang
;;
--- >8 ---
