diff options
| author | Stephan Bergmann <sbergman@redhat.com> | 2015-10-01 09:38:04 +0200 |
|---|---|---|
| committer | Stephan Bergmann <sbergman@redhat.com> | 2015-10-01 09:42:57 +0200 |
| commit | 7756a9581d531d9353dc72675f62d17c2b314170 (patch) | |
| tree | f7ef9f79ab925cc1ead1e97ce43fdc8befcaad8f /configure.ac | |
| parent | ebfc6b6863fa54abd33ba95130a8434c70e42f58 (diff) | |
Don't let old Clang using -std=c++11 mis-detect HAVE_CXX14_CONSTEXPR
...where an assert in a constexpr function merely triggers a -Wc++1y-extensions
(so doesn't stop configure from assuming HAVE_CXX14_CONSTEXPR, but will later
break with --enable-werror when building include/o3tl/typed_flags_set.hxx). So
stuff back the complex constexpr test function that was swapped out with
6cc54913077864ba92d2fdc3addec29ea89770fe "Work around GCC 5.1 ICE."
Change-Id: I04ba1dc08d96f776b331fa9d0cae1703f2796532
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index aec3e4a0cca0..946aa79e0766 100644 --- a/configure.ac +++ b/configure.ac @@ -6347,6 +6347,16 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ } enum E { e }; auto v = g(E::e); + + struct S { + int n_; + constexpr bool f() { + int n = n_; + int i = 0; + while (n > 0) { --n; ++i; } + return i == 0; + } + }; ]])], [cxx14_constexpr=yes], [cxx14_constexpr=no]) AC_LANG_POP([C++]) CXXFLAGS=$save_CXXFLAGS |