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| author | David Greene <greened@obbligato.org> | 2013-01-09 22:11:13 +0000 |
|---|---|---|
| committer | David Greene <greened@obbligato.org> | 2013-01-09 22:11:13 +0000 |
| commit | d2f8216ba496b139815aee29052093c1b0d7a996 (patch) | |
| tree | c67b0c125cbb888ca8dfc850f03512200603e4ea /autoconf | |
| parent | 78ec0255d9ab184af7799c14d93879e5f21b9007 (diff) | |
| download | llvm-d2f8216ba496b139815aee29052093c1b0d7a996.tar.gz llvm-d2f8216ba496b139815aee29052093c1b0d7a996.tar.bz2 llvm-d2f8216ba496b139815aee29052093c1b0d7a996.tar.xz | |
Disable -Wuninitialized for gcc
If the compiler is gcc, disable variants of -Wuninitialized depending
on the gcc version. This gets a lot of false positive warnings out of
the build.
Generate a new configure for the gcc -Wno-uninitialized fix.
Pick up -Wno-uninitialized from configure
Add the option -Wno[-maybe]-uninitialized as determined by configure.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172006 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'autoconf')
| -rw-r--r-- | autoconf/configure.ac | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/autoconf/configure.ac b/autoconf/configure.ac index a1426c1832..c186ed5574 100644 --- a/autoconf/configure.ac +++ b/autoconf/configure.ac @@ -1257,7 +1257,27 @@ AC_MSG_CHECKING([optional compiler flags]) CXX_FLAG_CHECK(NO_VARIADIC_MACROS, [-Wno-variadic-macros]) CXX_FLAG_CHECK(NO_MISSING_FIELD_INITIALIZERS, [-Wno-missing-field-initializers]) CXX_FLAG_CHECK(COVERED_SWITCH_DEFAULT, [-Wcovered-switch-default]) -AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT]) +dnl GCC's potential uninitialized use analysis is weak and presents lots of +dnl false positives, so disable it. +if test "$GXX" = "yes" +then + CXX_FLAG_CHECK(NO_MAYBE_UNINITIALIZED, [-Wno-maybe-uninitialized]) + dnl gcc 4.7 introduced -Wmaybe-uninitialized to distinguish cases which are + dnl known to be uninitialized from cases which might be uninitialized. We + dnl still want to catch the first kind of errors. + if test "$NO_MAYBE_UNINITIALIZED" != "-Wno-maybe-uninitialized" + then + CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized]) + else + dnl AC_SUBST doesn't work with empty strings. + NO_UNINITIALIZED= + fi +else + NO_UNINITIALIZED= + NO_MAYBE_UNINITIALIZED= +fi +AC_MSG_RESULT([$NO_VARIADIC_MACROS $NO_MISSING_FIELD_INITIALIZERS $COVERED_SWITCH_DEFAULT $NO_UNINITIALIZED $NO_MAYBE_UNINITIALIZED]) + dnl===-----------------------------------------------------------------------=== dnl=== |