I'm using mostly GCC to develop my library, but I'd like to ensure cross-compiler compatibility and especially standard conformance as much as possible. For this, I have add several -W... flags to command line. I'd also add -pedantic, but I have a problem with its warning about long long type. The latter is important for my library and is properly guarded with #if code, i.e. is not compiled on compilers that don't know it anyway.
In short: can I have GCC in -pedantic mode warn about any extension except long long?
add -Wno-long-long , or switch to C99 (use the gcc flag -std=c99). c99 provides long long.