diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 09b54a7d5f..5610c5759d 100644 --- a/configure.ac +++ b/configure.ac @@ -1689,6 +1689,26 @@ yes) fi AC_MSG_RESULT($ac_cv_enable_unreachable_code_warning) + AC_MSG_CHECKING(if we can make implicit function declaration an error in $CC) + ac_save_cc="$CC" + CC="$CC -Werror=implicit-function-declaration" + AC_CACHE_VAL(ac_cv_enable_implicit_function_declaration_error, + AC_COMPILE_IFELSE( + [ + AC_LANG_PROGRAM([[]], [[]]) + ],[ + ac_cv_enable_implicit_function_declaration_error=yes + ],[ + ac_cv_enable_implicit_function_declaration_error=no + ])) + CC="$ac_save_cc" + AC_MSG_RESULT($ac_cv_enable_implicit_function_declaration_error) + + if test $ac_cv_enable_implicit_function_declaration_error = yes + then + CFLAGS_NODIST="$CFLAGS_NODIST -Werror=implicit-function-declaration" + fi + # if using gcc on alpha, use -mieee to get (near) full IEEE 754 # support. Without this, treatment of subnormals doesn't follow # the standard. |