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| author | Matthew Barnes <mbarnes@redhat.com> | 2010-02-03 02:19:40 +0800 |
|---|---|---|
| committer | Matthew Barnes <mbarnes@redhat.com> | 2010-02-03 07:27:04 +0800 |
| commit | 0727097ac13ad746184ba0580247bff70cefbb68 (patch) | |
| tree | 3374a68bb7d9dd80775af3d39994cc1ec5b4e444 | |
| parent | dce48c142cae497ffe518b4a4427df6fac46c398 (diff) | |
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Clarify a configure.ac comment.
| -rw-r--r-- | configure.ac | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/configure.ac b/configure.ac index b034b76012..643d691a11 100644 --- a/configure.ac +++ b/configure.ac @@ -84,17 +84,19 @@ AS_COMPILER_FLAGS(WARNING_FLAGS, AC_SUBST(WARNING_FLAGS) dnl Other useful compiler warnings for test builds only. -dnl These may produce warnings we have no control over. +dnl These may produce warnings we have no control over, +dnl or false positives we don't always want to see. +dnl dnl -Wmissing-format-attribute dnl -Wshadow dnl -Wformat-nonliteral +dnl -Wstrict-aliasing=2 -dnl GCC 4.4 got more aggressive in it's aliasing optimizations, changing +dnl GCC 4.4 got more aggressive in its aliasing optimizations, changing dnl behavior that -- according to the C99 standard -- is supposed to be dnl undefined. We may still have aliasing abuses lying around that rely -dnl on GCC's previous "undefined" behavior but are hidden by type casts, -dnl so disable the strict-aliasing optimzation until GCC (or even LLVM) -dnl learns how to detect them and warn us about it. +dnl on GCC's previous "undefined" behavior, so disable strict-aliasing +dnl optimzation until we can find and fix all the abuses. dnl XXX This really belongs in AM_CFLAGS. AM_CPPFLAGS="$WARNING_FLAGS -fno-strict-aliasing" AC_SUBST(AM_CPPFLAGS) |