diff options
Diffstat (limited to 'src/aclocal.m4')
| -rw-r--r-- | src/aclocal.m4 | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/aclocal.m4 b/src/aclocal.m4 index 5637f6870f..408035aaeb 100644 --- a/src/aclocal.m4 +++ b/src/aclocal.m4 @@ -466,7 +466,7 @@ krb5_ac_warn_cxxflags_set=${WARN_CXXFLAGS+set} ]) dnl AC_DEFUN(TRY_WARN_CC_FLAG,[dnl - cachevar=`echo "krb5_cv_cc_flag_$1" | sed s/[[^a-zA-Z0-9_]]/_/g` + cachevar=`echo "krb5_cv_cc_flag_$1" | sed -e s/=/_eq_/g -e s/-/_dash_/g -e s/[[^a-zA-Z0-9_]]/_/g` AC_CACHE_CHECK([if C compiler supports $1], [$cachevar], [# first try without, then with AC_TRY_COMPILE([], 1;, @@ -565,7 +565,17 @@ if test "$GCC" = yes ; then TRY_WARN_CC_FLAG(-W$flag) fi done - # missing-prototypes? maybe someday + # We require function declarations now. + # + # In some compiler versions -- e.g., "gcc version 4.2.1 (Apple + # Inc. build 5664)" -- the -Werror- option works, but the -Werror= + # version doesn't cause implicitly declared functions to be + # flagged as errors. If neither works, -Wall implies + # -Wimplicit-function-declaration so don't bother. + TRY_WARN_CC_FLAG(-Werror-implicit-function-declaration) + if test "implicit-function-declaration_supported" = no; then + TRY_WARN_CC_FLAG(-Werror=implicit-function-declaration) + fi # fi if test "`uname -s`" = Darwin ; then |