[PATCH] sim: use -Werror when probing for supported warning flags

[Simon Marchi]

On 2021-04-21 4:44 p.m., Mike Frysinger wrote:
> On 21 Apr 2021 14:51, Simon Marchi via Gdb-patches wrote:
>> When building with clang, we get:
>>
>>     error: unknown warning option '-Wmissing-parameter-type' [-Werror,-Wunknown-warning-option]
>>
>> This is because clang only warns by default when encountering an unknown
>> warning option, and the probe for supported warning flags is done
>> without -Werror.  All flags are therefore accepted by configure, but
>> then it breaks when actually compiling a source file with -Werror.
>>
>> This is equivalent to this commit in gdb:
>>
>>     3e019bdc20eb81b91ab5bc774386201b874c0bac
>>     gdb: Use -Werror when checking for (un)supported warning flags
>>
>> We then see some other compilation errors when building with clang and
>> -Werror, they can be dealt with later.
>>
>> sim/ChangeLog:
>>
>> 	* m4/sim_ac_option_warnings.m4 (SIM_AC_OPTION_WARNINGS):
>> 	Use -Werror when probing for supported warning flags.
> 
> so this one file/line looks fine
> 
> but the regen looks a little out of whack.  when i apply your patch and
> regenerate everything, i don't have any aclocal.m4 changes.  why do you ?
> are you running the tools manually and with a diff -I order ?
> -mike
> 

I run `autoreconf -vf` inside sim/, using binaries compiled from
upstream (not my distro's versions).

Simon