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build: please Clang++ 3.2+ on Flex scanners

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Clang++, with -Wall, rejects code generated by Flex (for C scanners):

  CXX      examples/calc++/examples_calc___calc__-calc++-scanner.o
  In file included from examples/calc++/calc++-scanner.cc:1:
  error: implicit conversion of NULL constant to 'bool' [-Werror,-Wnull-conversion]
  if ( ! ( (yy_buffer_stack) ? (yy_buffer_stack)[(yy_buffer_stack_top)] : __null) ) {
       ~                                                                  ^~~~~~
                                                                          false
* configure.ac (WARN_NO_NULL_CONVERSION_CXXFLAGS): Compute it.
* examples/calc++/local.mk (examples_calc___calc___CXXFLAGS): Use it.
This commit is contained in:
Akim Demaille
2013-01-30 15:28:08 +01:00
parent e8f7155d98
commit 1217688141
2 changed files with 4 additions and 0 deletions
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2
configure.ac
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@@ -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