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79 lines
3.2 KiB
Diff
79 lines
3.2 KiB
Diff
From f0b74640137f07ed74027f98fbf6d1c0d98939bf Mon Sep 17 00:00:00 2001
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From: Stephan Bergmann <sbergman@redhat.com>
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Date: Mon, 20 Apr 2020 11:40:24 +0200
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Subject: Add --with-latest-c++ to explicitly opt in for
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-std=c++20/-std:c++latest
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Adaptation of this change to this branch. The point is to avoid
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compiling as C++2a as the code for externals has not been patched
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properly for that here. Here is the original commit message even if I
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assume it is a bit misleading in this branch:
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cd472d1d8489f30797f47d3f6dafede28c1feb90 "Compile as C++2a, where available" had
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started to unconditionally check for support of -std=c++2a (and later also
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-std=c++20) for Clang and GCC, but that can cause occasional issues especially
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for Linux distros, see e.g. 55c724b93dfd4c9a1afb10d60fbc2d7a9a66cf61 "replace
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boost::bimap in sdext pdfimport" or
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<https://bugzilla.redhat.com/show_bug.cgi?id=1818723>
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"/usr/include/boost/format/alt_sstream_impl.hpp incompatible with -std=c++20
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(std::allocator::allocate hint argument)" (where
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677c8de4fa79cd9b278b142013ba7f1c9e4e41c3 "external/boost: Adapt to
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std::allocator parts removed in C++20" is not picked up due to
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--with-system-boost).
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So better require an explicit opt-in via a new --with-latest-c++. And while at
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it, also make that enable -std:c++latest for MSVC.
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Change-Id: I2d1f03144fad9a7884562e56b1b76cab5eb8f080
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Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92555
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Tested-by: Jenkins
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Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
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Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93204
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Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
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Reviewed-by: Tor Lillqvist <tml@collabora.com>
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Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93692
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Tested-by: Tor Lillqvist <tml@collabora.com>
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---
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configure.ac | 18 ++++++++++++++++--
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1 file changed, 16 insertions(+), 2 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 78080305f3d6..8364138bdc96 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -2143,6 +2143,12 @@ libo_FUZZ_ARG_WITH(lxml,
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report widget classes and ids.]),
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,)
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+libo_FUZZ_ARG_WITH(latest-c++,
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+ AS_HELP_STRING([--with-latest-c++],
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+ [Try to enable the latest features of the C++ compiler, even if they are not yet part of a
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+ published standard.]),,
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+ [$with_latest_c__=no])
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+
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dnl ===================================================================
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dnl Branding
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dnl ===================================================================
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@@ -6456,9 +6462,17 @@ dnl ===================================================================
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AC_MSG_CHECKING([whether $CXX_BASE supports C++17])
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CXXFLAGS_CXX11=
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if test "$COM" = MSC -a "$COM_IS_CLANG" != TRUE; then
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- CXXFLAGS_CXX11='-std:c++17 -Zc:__cplusplus'
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+ if test "$with_latest_c__" = yes; then
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+ CXXFLAGS_CXX11=-std:c++latest
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+ else
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+ CXXFLAGS_CXX11=-std:c++17
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+ fi
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+ CXXFLAGS_CXX11="$CXXFLAGS_CXX11 -Zc:__cplusplus"
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elif test "$GCC" = "yes" -o "$COM_IS_CLANG" = TRUE; then
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- my_flags='-std=c++2a -std=c++17 -std=c++1z'
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+ my_flags='-std=c++17 -std=c++1z'
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+ if test "$with_latest_c__" = yes; then
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+ my_flags="-std=gnu++2a -std=c++2a $my_flags"
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+ fi
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for flag in $my_flags; do
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if test "$COM" = MSC; then
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flag="-Xclang $flag"
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--
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cgit v1.2.1
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