Re: [PATCH] Makefile: detect compiler and enable more warnings in DEVELOPER=1

[Duy Nguyen <pclouds@gmail.com>]

On Sun, Mar 18, 2018 at 10:06 AM, Eric Sunshine <sunshine@sunshineco.com> wrote:
> 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@peff.net>
>> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
>> ---
>> 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 ---

Does it still build ok for you with your changes squashed in? I think
the check for clang4/gcc6 and setting -Wextra in config.mak.dev may
backfire because clang9 probably has a lot more warnings enabled and
some of them we don't want and cause compile error...
-- 
Duy