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By default, clang only warns about unknown -W options, it doesn't 

generate an error for them.  Force them to be treated as errors, so we
correctly test whether an option is supported.


git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@36732 f5534014-38df-0310-8fa8-9805f1628bb7
This commit is contained in:
guy 2011-04-20 09:16:44 +00:00
parent aaa2afdae2
commit ec6ad6f311
1 changed files with 9 additions and 0 deletions
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9
acinclude.m4
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@ -1724,12 +1724,21 @@ fi
# We do this because not all such options are necessarily supported by
# the version of the particular compiler we're using.
#
# NOTE: clang, by default, only warns about unknown -W options.
# If we're using clang, we turn on -Werror=unknown-warning-option
# so that it fails if we pass it a -W option it doesn't know about
# but doesn't fail for any other warning that the test program might
# produce.
#
AC_DEFUN([AC_WIRESHARK_GCC_CFLAGS_CHECK],
[GCC_OPTION="$1"
AC_MSG_CHECKING(whether we can add $GCC_OPTION to CFLAGS)
if test "x$ac_supports_gcc_flags" = "xyes" ; then
CFLAGS_saved="$CFLAGS"
CFLAGS="$CFLAGS $GCC_OPTION"
if test "x$CC" = "xclang" ; then
CFLAGS="$CFLAGS -Werror=unknown-warning-option"
fi
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([[
int foo;