Issue #23545: Turn on extra warnings on GCC.

1 files changed, 61 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 328c610..0eaa06c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1517,6 +1517,26 @@ case $GCC in
 yes)
     CFLAGS_NODIST="$CFLAGS_NODIST -std=c99"
 
+    AC_MSG_CHECKING(for -Wextra)
+     ac_save_cc="$CC"
+     CC="$CC -Wextra -Werror"
+     AC_CACHE_VAL(ac_cv_extra_warnings,
+       AC_COMPILE_IFELSE(
+         [
+           AC_LANG_PROGRAM([[]], [[]])
+         ],[
+           ac_cv_extra_warnings=yes
+         ],[
+           ac_cv_extra_warnings=no
+         ]))
+     CC="$ac_save_cc"
+    AC_MSG_RESULT($ac_cv_extra_warnings)
+
+    if test $ac_cv_extra_warnings = yes
+    then
+      CFLAGS_NODIST="$CFLAGS_NODIST -Wextra"
+    fi
+
     # Python doesn't violate C99 aliasing rules, but older versions of
     # GCC produce warnings for legal Python code.  Enable
     # -fno-strict-aliasing on versions of GCC that support but produce
@@ -1581,6 +1601,47 @@ yes)
     if test $ac_cv_disable_unused_result_warning = yes
     then
       BASECFLAGS="$BASECFLAGS -Wno-unused-result"
+      CFLAGS_NODIST="$CFLAGS_NODIST -Wno-unused-result"
+    fi
+
+    AC_MSG_CHECKING(if we can turn off $CC unused parameter warning)
+     ac_save_cc="$CC"
+     CC="$CC -Wunused-parameter -Werror"
+     AC_CACHE_VAL(ac_cv_disable_unused_parameter_warning,
+       AC_COMPILE_IFELSE(
+         [
+           AC_LANG_PROGRAM([[]], [[]])
+         ],[
+           ac_cv_disable_unused_parameter_warning=yes
+         ],[
+           ac_cv_disable_unused_parameter_warning=no
+         ]))
+     CC="$ac_save_cc"
+    AC_MSG_RESULT($ac_cv_disable_unused_parameter_warning)
+
+    if test $ac_cv_disable_unused_parameter_warning = yes
+    then
+      CFLAGS_NODIST="$CFLAGS_NODIST -Wno-unused-parameter"
+    fi
+
+    AC_MSG_CHECKING(if we can turn off $CC missing field initializers warning)
+     ac_save_cc="$CC"
+     CC="$CC -Wmissing-field-initializers -Werror"
+     AC_CACHE_VAL(ac_cv_disable_missing_field_initializers,
+       AC_COMPILE_IFELSE(
+         [
+           AC_LANG_PROGRAM([[]], [[]])
+         ],[
+           ac_cv_disable_missing_field_initializers=yes
+         ],[
+           ac_cv_disable_missing_field_initializers=no
+         ]))
+     CC="$ac_save_cc"
+    AC_MSG_RESULT($ac_cv_disable_missing_field_initializers)
+
+    if test $ac_cv_disable_missing_field_initializers = yes
+    then
+      CFLAGS_NODIST="$CFLAGS_NODIST -Wno-missing-field-initializers"
     fi
 
     AC_MSG_CHECKING(if we can turn on $CC mixed sign comparison warning)