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Improved comment for GCC_DIAGNOSTIC_AWARE

pull/35/head
Jeffrey Walton 2015-07-21 19:02:11 -04:00
parent 3c56063c3f
commit 2441817708
1 changed files with 4 additions and 0 deletions
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misc.h
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@ -44,6 +44,10 @@
// Used to supress some warnings in some header and implementation files.
// Some platforms, like CentOS and OpenBSD, use old compilers that don't understand -Wno-unknown-pragma.
// These diagnostic blocks showed up somewhere between GCC 4.1 and 4.2, but 4.4 gets us semi-modern compilers.
// It seems using diagnostic blocks to manage warnings is semi-broken for GCC. Just leave it in place because
// GCC_DIAGNOSTIC_AWARE will help silence some warnings under GCC, and Clang responds to it as expected.
// (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53431).
#define GCC_DIAGNOSTIC_AWARE ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7)) || defined(__clang__))
// Used to manage function-level optimizations when working around compiler issues.