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POUsing SCons TryCompile to examine compiler flag support on Windows
 

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  1. POUsing SCons TryCompile to examine compiler flag support on Windows
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    <p>With GCC and clang, I've been able to use SCons 'TryCompile' feature to build a simple configure check to determine if the currently configured compiler supports a given compile flag. Basically, clone the env, add the flag in question to CFLAGS, CCFLAGS, or CXXFLAGS, as appropriate, execute TryCompile, and if the TryCompile succeeds, then the flag is supported and we can add it to the real env.</p> <ul> <li>This works perfectly with gcc, because unknown flags are errors and the compiler exits with a non-zero status.</li> <li>With clang, it works reasonably well too: clang by default treats unknown errors as warnings, but if you pass it -Werror it will turn unknown flags into errors. So my wrapper around TryCompile just always passes -Werror along with the flag to be tested if it knows we are using clang.</li> </ul> <p>However, this all falls over with the Microsoft toolchain because as far as I can discover, there is <em>no way</em> to convince the compiler to treat unknown flags as errors: they are always warnings, even if you pass the flag to make warnings errors. Since the compile exits cleanly wither or not the flag is accepted, TryCompile always succeeds. See <a href="https://stackoverflow.com/questions/15259720/how-can-i-make-the-microsoft-c-compiler-treat-unknown-flags-as-errors-rather-t" title="this question">this question</a> for details on the various attempts I have made to get MSVC to exit with a non-zero status.</p> <p>Any ideas on how I can make this work? Is there another SCons facility that I'm overlooking that can do this job for me? Should I interpose on TryCompile on MS platforms and parse the compiler output rather than examining the exit status. I'm really happy with using TryCompile for configure time flag detection with clang and gcc, but if I can't get MSVC to cooperate I'm going to need to abandon this whole approach, and I'm pretty loathe to do that since it is working so well so far.</p>
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