build: please Clang++ 3.2+ on Flex scanners

[bison.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 76a0ecf98e6b269caf42ea97488fa99106499d5e..289b29956d0b8b3969ed74dcb3cc622d74cbd545 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -133,6 +133,8 @@ if test "$enable_gcc_warnings" = yes; then
   # Warnings for the test suite only.
   gl_WARN_ADD([-Wundef], [WARN_CXXFLAGS_TEST])
   gl_WARN_ADD([-pedantic], [WARN_CXXFLAGS_TEST])
+  # Clang++ 3.2+ reject C code generated by Flex.
+  gl_WARN_ADD([-Wno-null-conversion], [WARN_NO_NULL_CONVERSION_CXXFLAGS])
   # Variants break strict aliasing analysis.
   gl_WARN_ADD([-fno-strict-aliasing], [NO_STRICT_ALIAS_CXXFLAGS])
   CXXFLAGS=$save_CXXFLAGS