Re: Lots of -Wunused-command-line-argument warnings from clang

[Sven Joachim]

On 2019-09-02 14:18 -0400, Thomas Dickey wrote:

> On Mon, Sep 02, 2019 at 06:39:43PM +0200, Sven Joachim wrote:
>> Building ncurses with clang produces the following warning (line-wrapped
>> for readability) on every invocation of the compiler:
>>
>> ,----
>> | clang: warning: argument unused during compilation:
>> | '--param max-inline-insns-single=1200' [-Wunused-command-line-argument]
>> `----
>>
>> It goes without saying that this makes build logs pretty much
>> unreadable. :-(
>>
>> There are CF_CLANG_COMPILER and CF_C_INLINE functions in aclocal.m4
>> which I think are meant to avoid this, but it does not work for me.
>
> I haven't updated those recently,
> but in a quick check, don't see a new problem.
>
>> Tested with clang-8 and clang-7 on Debian unstable, but I think the
>> problem had been around for quite a while already.  I did not specify
>> any fancy configure options, just ran
>>
>> ,----
>> | $ ./configure CC=clang-7 CXX=clang++-7
>> `----
>>
>> Any ideas?
>
> add --enable-warnings
>
> I seem to recall someone mentioning this recently: clang without any
> options will warn about things that gcc does not.  My macros are designed
> to filter/amend/whatever when warnings are wanted.

Thanks, --enable-warnings helped.

> Of course doing that will show some warnings that you didn't see before,
> but I work on those, to reduce them :-)

Clang 8.0.1 prints only a few -Wcast-qual warnings.

Cheers,
       Sven