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gccclangc-preprocessorpragma

Should I use "#pragma GCC ..." or "#pragma clang ..." in Xcode

Which of these should I use to ignore a warning?

#pragma clang diagnostic ignored "-W<warning>"
#pragma GCC diagnostic ignored "-W<warning>"

Both seems to work for me, however which one is the correct to use?

Should I always use the one matching the compiler I'm using?

Solution

  • Generally, you should prefer #pragma GCC in cases where the pragma is GCC-specific, or is equally applicable to GCC, Clang, and other compilers which try to be GCC-compatible (such as ICC). Use #pragma clang in cases where the pragma is in some way Clang-specific (such as a diagnostic option which doesn't exist in GCC).