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Unread 15-01-2013, 15:37
rbmj rbmj is offline
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FRC #0612 (Chantilly Robotics)
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Re: Alternate GCC Toolchain

The biggest thing is that GCC seems to conform to the standard more strictly in c++11 mode than in c++98 mode. In C++98 mode it is technically wrong to declare and initialize a static constant of non-integral type in a header file, however gcc accepts it. However, with c++11 and the constexpr keyword there is an easy workaround so gcc wants you to use constexpr instead of const. This causes compile errors, though these can be downgraded to warnings with the -fpermissive flag. However, I feel uncomfortable adding this flag in as I believe that code should conform to the standard and be warning-free. Although in some cases these are merely stylistic concerns, I think that in many cases these can highlight a bug or undefined behavior. This is why I enable -Wall in the toolchain file.

I'm working on cleaning up the WPILib headers so that they won't fire off warnings. This way they don't fill up the build log for the end user. Library headers that fire warnings are at best annoying and at worst can overwhelm valuable output from the compiler.