X-Git-Url: https://ncurses.scripts.mit.edu/?a=blobdiff_plain;f=test%2Faclocal.m4;h=813527050143cb3362a1fdbb346365f71cc1fff0;hb=d1cc319afccb0d472465718a748664e7cef00840;hp=e149eaf2221de6d9d021aed3f14cdd9c50a621a4;hpb=1f7a36fe16b11bb4aab51be89bbc1b0f75936b78;p=ncurses.git

diff --git a/test/aclocal.m4 b/test/aclocal.m4
index e149eaf2..81352705 100644
--- a/test/aclocal.m4
+++ b/test/aclocal.m4
@@ -27,7 +27,7 @@ dnl sale, use or other dealings in this Software without prior written       *
 dnl authorization.                                                           *
 dnl***************************************************************************
 dnl
-dnl $Id: aclocal.m4,v 1.182 2020/08/29 13:24:15 tom Exp $
+dnl $Id: aclocal.m4,v 1.184 2020/10/31 20:05:07 tom Exp $
 dnl
 dnl Author: Thomas E. Dickey
 dnl
@@ -568,7 +568,7 @@ if test "$cf_have_curses_lib" = no; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CLANG_COMPILER version: 3 updated: 2020/08/28 04:10:22
+dnl CF_CLANG_COMPILER version: 4 updated: 2020/10/31 15:46:50
 dnl -----------------
 dnl Check if the given compiler is really clang.  clang's C driver defines
 dnl __GNUC__ (fooling the configure script into setting $GCC to yes) but does
@@ -587,21 +587,34 @@ ifelse([$2],,CLANG_COMPILER,[$2])=no
 if test "$ifelse([$1],,[$1],GCC)" = yes ; then
 	AC_MSG_CHECKING(if this is really Clang ifelse([$1],GXX,C++,C) compiler)
 	cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
-	ifelse([$3],,CFLAGS,[$3])="$ifelse([$3],,CFLAGS,[$3]) -Qunused-arguments"
 	AC_TRY_COMPILE([],[
 #ifdef __clang__
 #else
 make an error
 #endif
 ],[ifelse([$2],,CLANG_COMPILER,[$2])=yes
-cf_save_CFLAGS="$cf_save_CFLAGS -Qunused-arguments"
 ],[])
 	ifelse([$3],,CFLAGS,[$3])="$cf_save_CFLAGS"
 	AC_MSG_RESULT($ifelse([$2],,CLANG_COMPILER,[$2]))
 fi
 
-if test "x$CLANG_COMPILER" = "xyes" ; then
-	CF_APPEND_TEXT(CFLAGS,-Wno-error=implicit-function-declaration)
+if test "x$ifelse([$2],,CLANG_COMPILER,[$2])" = "xyes" ; then
+	for cf_clang_opt in \
+		-Qunused-arguments \
+		-Wno-error=implicit-function-declaration
+	do
+		AC_MSG_CHECKING(if option $cf_clang_opt works)
+		AC_TRY_LINK([
+			#include <stdio.h>],[
+			printf("hello!\n");],[
+			cf_clang_optok=yes],[
+			cf_clang_optok=no])
+		AC_MSG_RESULT($cf_clang_optok)
+		if test $cf_clang_optok = yes; then
+			CF_VERBOSE(adding option $cf_clang_opt)
+			CF_APPEND_TEXT(CFLAGS,$cf_clang_opt)
+		fi
+	done
 fi
 ])
 dnl ---------------------------------------------------------------------------
@@ -1311,9 +1324,15 @@ if test "x$with_string_hacks" = "xyes"; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ENABLE_WARNINGS version: 6 updated: 2020/08/28 04:10:22
+dnl CF_ENABLE_WARNINGS version: 7 updated: 2020/08/29 09:05:21
 dnl ------------------
 dnl Configure-option to enable gcc warnings
+dnl
+dnl $1 = extra options to add, if supported
+dnl $2 = option for checking attributes.  By default, this is done when
+dnl      warnings are enabled.  For other values:
+dnl      yes: always do this, e.g., to use in generated library-headers
+dnl      no: never do this
 AC_DEFUN([CF_ENABLE_WARNINGS],[
 if ( test "$GCC" = yes || test "$GXX" = yes )
 then
@@ -1328,9 +1347,10 @@ CF_ARG_ENABLE(warnings,
 AC_MSG_RESULT($with_warnings)
 if test "$with_warnings" = "yes"
 then
-	CF_GCC_ATTRIBUTES
+	ifelse($2,,[CF_GCC_ATTRIBUTES])
 	CF_GCC_WARNINGS($1)
 fi
+ifelse($2,yes,[CF_GCC_ATTRIBUTES])
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
@@ -1599,14 +1619,14 @@ AC_CACHE_CHECK(for openpty header,cf_cv_func_openpty,[
 ])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_ATTRIBUTES version: 18 updated: 2020/03/10 18:53:47
+dnl CF_GCC_ATTRIBUTES version: 19 updated: 2020/08/29 09:05:21
 dnl -----------------
 dnl Test for availability of useful gcc __attribute__ directives to quiet
 dnl compiler warnings.  Though useful, not all are supported -- and contrary
 dnl to documentation, unrecognized directives cause older compilers to barf.
 AC_DEFUN([CF_GCC_ATTRIBUTES],
 [
-if test "$GCC" = yes
+if ( test "$GCC" = yes || test "$GXX" = yes )
 then
 cat > conftest.i <<EOF
 #ifndef GCC_PRINTF