[CMake] TRY_RUN wrong program return value with --debug-compile

[Eduardo Alberto Hernández Muñoz]

Hi,

> Zitat von Eduardo Alberto Hern?ndez Mu?oz <coz.eduardo.hernandez at gmail.com>:
>> I have the file check_openal_spec_version_1_1.cpp which contains:
>>
>>     #define AL_VERSION_1_1
>>     #define AL_VERSION_1_0
>>
>>     int main()  {
>>
>>     #ifdef AL_VERSION_1_1
>>         return 2;
>>     #elif AL_VERSION_1_0
>>         return 1;
>>     #else
>>         return -1;
>>     #endif
>>
>>     }
>
> That elif is wrong if you don't assign a value to the define.

Completely true. Still it's not what is causing my problem :p


>> The interesting part, is that this problem only happens when I pass
>> the --debug-trycompile to cmake. Without the flag, CMake works
>> wonderfully.
>
> That option is known to cause such problems, don't know why.

It's a bother that it causes trouble, because it is pretty useful for
debugging. I'll get the CMake HEAD, and if the problem persists there,
I'll file a bug.

-Coz