dnl Warnings are for preprocessor too
if test x$enable_warnings = xyes ; then
AM_CPPFLAGS="$AM_CPPFLAGS -Wall -Wextra"
- case $gxx_version in
- 9.*|10.*|clang-10*)
- AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-copy";;
- *);;
- esac
+ dnl Shut off warning -Wdeprecated-copy, which triggers too much
+ dnl note that g++ always accepts -Wno-xxx, even when -Wxxx is an error.
+ AC_LANG_PUSH(C++)
+ AX_CHECK_COMPILE_FLAG([-Wdeprecated-copy],
+ [AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-copy"], [], [-Werror])
+ AC_LANG_POP(C++)
fi
case $gxx_version in
2.*|3.*) AC_ERROR([gcc >= 4.6 is required]);;
--- /dev/null
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
+#
+# DESCRIPTION
+#
+# Check whether the given FLAG works with the current language's compiler
+# or gives an error. (Warnings, however, are ignored)
+#
+# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
+# success/failure.
+#
+# If EXTRA-FLAGS is defined, it is added to the current language's default
+# flags (e.g. CFLAGS) when the check is done. The check is thus made with
+# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
+# force the compiler to issue an error when a bad flag is given.
+#
+# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
+# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
+# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 6
+
+AC_DEFUN([AX_CHECK_COMPILE_FLAG],
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
+AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
+ ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
+ _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
+ AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
+ [AS_VAR_SET(CACHEVAR,[yes])],
+ [AS_VAR_SET(CACHEVAR,[no])])
+ _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
+AS_VAR_IF(CACHEVAR,yes,
+ [m4_default([$2], :)],
+ [m4_default([$3], :)])
+AS_VAR_POPDEF([CACHEVAR])dnl
+])dnl AX_CHECK_COMPILE_FLAGS
equivalent to hitting the left arrow key (bug 11678).
- Other than directly inserted, now references can also be pasted as insets
- into an equation, instead of simply as text (bug 11539).
+ into an equation, instead of simply as text (bug 11539).
- Add support for High DPI screens in Windows and Linux (bug 12060).
- The WM class of LyX for X Window environment is now the package name, typically
"lyx" or "lyx[suffix]" (bug 11930).
+
+- Fix warnings with recent compilers (gcc 11, clang+++ >= 10)