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Diffstat (limited to 'm4/compiler_warnings.m4')
| -rw-r--r-- | m4/compiler_warnings.m4 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4 new file mode 100644 index 00000000..6cea2f74 --- /dev/null +++ b/m4/compiler_warnings.m4 @@ -0,0 +1,31 @@ +AC_DEFUN([NM_COMPILER_WARNINGS], +[AC_ARG_ENABLE(more-warnings, + AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]), + set_more_warnings="$enableval",set_more_warnings=yes) +AC_MSG_CHECKING(for more warnings, including -Werror) +if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then + AC_MSG_RESULT(yes) + CFLAGS="-Wall -Werror -std=gnu89 $CFLAGS" + + for option in -Wshadow -Wmissing-declarations -Wmissing-prototypes \ + -Wdeclaration-after-statement -Wstrict-prototypes \ + -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare \ + -fno-strict-aliasing; do + SAVE_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $option" + AC_MSG_CHECKING([whether gcc understands $option]) + AC_TRY_COMPILE([], [], + has_option=yes, + has_option=no,) + if test $has_option = no; then + CFLAGS="$SAVE_CFLAGS" + fi + AC_MSG_RESULT($has_option) + unset has_option + unset SAVE_CFLAGS + done + unset option +else + AC_MSG_RESULT(no) +fi +]) |