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| author | David Greene <greened@obbligato.org> | 2013-01-15 18:21:15 +0000 |
|---|---|---|
| committer | David Greene <greened@obbligato.org> | 2013-01-15 18:21:15 +0000 |
| commit | 0b198ca38f9f58858ad8aa4bf91a2a06a6dee0e5 (patch) | |
| tree | 2e5267d74b5e99671b0020b24aa9fc6dd2391ad9 /autoconf | |
| parent | 111877dd12c60406a77f8cae702190d9762bcaed (diff) | |
| download | external_llvm-0b198ca38f9f58858ad8aa4bf91a2a06a6dee0e5.zip external_llvm-0b198ca38f9f58858ad8aa4bf91a2a06a6dee0e5.tar.gz external_llvm-0b198ca38f9f58858ad8aa4bf91a2a06a6dee0e5.tar.bz2 | |
Disable Uninitialized Use Warnings for Broken gcc Versions
Some versions of gcc accept unsupported -W flags and run just fine if
there are no warnings, but die with an unsupported flag error if a
warning is encountered. gcc 4.3 and gcc 4.4 both exhibit this
behavior for -Wno-maybe-uninitialized. Therefore, if the flag check
for -Wno-maybe-uninitialized succeeds, only use
-Wno-maybe-uninitialized if we are using gcc version 4.7 or greater.
Use -Wno-uninitialized otherwise.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172543 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'autoconf')
| -rw-r--r-- | autoconf/configure.ac | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/autoconf/configure.ac b/autoconf/configure.ac index c186ed557..ce36010 100644 --- a/autoconf/configure.ac +++ b/autoconf/configure.ac @@ -1269,8 +1269,23 @@ then then CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized]) else - dnl AC_SUBST doesn't work with empty strings. - NO_UNINITIALIZED= + dnl Some versions of gcc accept unsupported -W flags if there is + dnl no warning but stop with an error when a warning is + dnl encountered. If this gcc is earlier than 4.7, just use + dnl -Wno-uninitialized. + gxx_version=`$CXX -dumpversion` + gxx_version_major=`echo $gxx_version | cut -d'.' -f1` + gxx_version_minor=`echo $gxx_version | cut -d'.' -f2` + gxx_version_patch=`echo $gxx_version | cut -d'.' -f3` + + if test "$gxx_version_major" -ge "4" \ + && test "$gxx_version_minor" -ge "7"; then + dnl AC_SUBST doesn't work with empty strings. + NO_UNINITIALIZED= + else + NO_MAYBE_UNINITIALIZED= + CXX_FLAG_CHECK(NO_UNINITIALIZED, [-Wno-uninitialized]) + fi fi else NO_UNINITIALIZED= |