[LTP] [PATCH] config: Explicitly set gnu99

[Cyril Hrubis]

Hi!
> > I woder if this would work with different compilers. I suppose clang
> > does work, but what about icc?
> 
> Clang is fine. I doubt that icc compiles LTP at present unless it does
> support GNU extensions.

Fair enough.

> > I supose that we get tons of 'can't do pointer arithmetics on void*
> > pointers and stuff' with plain c99. Maybe it would be better to clean
> > these out instead.
> 
> https://github.com/richiejp/ltp/actions/runs/3515165803/jobs/5890081736
> 
> Some of this is solved by -D_XOPEN_SOURCE=700 or some other macro (we
> need multiple). However it doesn't end there:
> 
>  make STDCFLAGS='-std=c2x -D_XOPEN_SOURCE=700'
> make -C "lib" \
> 	-f "/home/rich/qa/ltp/lib/Makefile" all
> make[1]: Entering directory '/home/rich/qa/ltp/lib'
> In file included from ../include/old/test.h:37,
>                  from get_path.c:41:
> get_path.c: In function ‘tst_get_path’:
> ../include/tst_minmax.h:10:9: warning: implicit declaration of function ‘typeof’ [-Wimplicit-function-declaration]
>    10 |         typeof(a) _a = (a); \
>       |         ^~~~~~


Hmm that's strange, supposedly typeof() is finally standartized in c2x,
but it would be obviously missing from anything older.

> We probably also use 'x ?: y' and stuff like that.
> 
> So this opens up a rats nest basically.

Sigh, well LTP was never a nice codebase, at least it compiles most of
the time these days.

-- 
Cyril Hrubis
chrubis@suse.cz