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Use -Wno-deprecated-copy only when supported by compiler

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This is better than depending on compiler version. In particular,
Apple clang versions do not match regular clang versions.

Note that -Wno-deprecated-copy will always be used with g++, since
this compiler allows to suppress warnings it does not know about
(-Wno-zorg is valid, even though -Wzorg triggers an error).
This commit is contained in:
Jean-Marc Lasgouttes 2020-10-13 18:26:34 +02:00
parent c516c86d19
commit 4aee447af1
2 changed files with 59 additions and 5 deletions
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11
config/lyxinclude.m4
View File

@ -409,11 +409,12 @@ if test x$GXX = xyes; then
dnl Warnings are for preprocessor too
if test x$enable_warnings = xyes ; then
AM_CPPFLAGS="$AM_CPPFLAGS -Wall -Wextra"
case $gxx_version in
9.*|10.*|clang-10*|clang-11*)
AM_CXXFLAGS="$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([-Wno-deprecated-copy],
[AM_CXXFLAGS="$AM_CXXFLAGS -Wno-deprecated-copy"], [], [-Werror])
AC_LANG_POP(C++)
fi
case $gxx_version in
2.*|3.*|4.@<:@0-6@:>@) AC_MSG_ERROR([gcc >= 4.7 is required]);;

53
m4/ax_check_compile_flag.m4 Normal file
View File

@ -0,0 +1,53 @@
# ===========================================================================
# 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