FYI:
-------- Forwarded Message --------
Subject: [Libreoffice-commits] core.git: configure.ac
Date: Mon, 20 Apr 2020 13:41:29 +0000 (UTC)
From: Stephan Bergmann (via logerrit) <logerrit@xxxxxxxxxxxxxxxxxxxxxx>
Reply-To: libreoffice@xxxxxxxxxxxxxxxxxxxxx
To: libreoffice-commits@xxxxxxxxxxxxxxxxxxxxx
configure.ac | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
New commits:
commit 42f29b7f3f1bedac3fc057edfab985ffb03fd53b
Author: Stephan Bergmann <sbergman@xxxxxxxxxx>
AuthorDate: Mon Apr 20 11:40:24 2020 +0200
Commit: Stephan Bergmann <sbergman@xxxxxxxxxx>
CommitDate: Mon Apr 20 15:40:55 2020 +0200
Add --with-latest-c++ to explicitly opt in for
-std=c++20/-std:c++latest
cd472d1d8489f30797f47d3f6dafede28c1feb90 "Compile as C++2a,
where available" had
started to unconditionally check for support of -std=c++2a (and
later also
-std=c++20) for Clang and GCC, but that can cause occasional issues
especially
for Linux distros, see e.g.
55c724b93dfd4c9a1afb10d60fbc2d7a9a66cf61 "replace
boost::bimap in sdext pdfimport" or
<https://bugzilla.redhat.com/show_bug.cgi?id=1818723>
"/usr/include/boost/format/alt_sstream_impl.hpp incompatible with
-std=c++20
(std::allocator::allocate hint argument)" (where
677c8de4fa79cd9b278b142013ba7f1c9e4e41c3 "external/boost: Adapt to
std::allocator parts removed in C++20" is not picked up due to
--with-system-boost).
So better require an explicit opt-in via a new
--with-latest-c++. And while at
it, also make that enable -std:c++latest for MSVC.
Change-Id: I2d1f03144fad9a7884562e56b1b76cab5eb8f080
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92555
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@xxxxxxxxxx>
diff --git a/configure.ac b/configure.ac
index 2c4a018b0dd8..376bdf4816da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2178,6 +2178,12 @@ libo_FUZZ_ARG_WITH(lxml,
report widget classes and ids.]),
,)
+libo_FUZZ_ARG_WITH(latest-c++,
+ AS_HELP_STRING([--with-latest-c++],
+ [Try to enable the latest features of the C++ compiler, even if
they are not yet part of a
+ published standard.]),,
+ [$with_latest_c__=no])
+
dnl ===================================================================
dnl Branding
dnl ===================================================================
@@ -6517,9 +6523,17 @@ dnl
===================================================================
AC_MSG_CHECKING([whether $CXX_BASE supports C++17])
CXXFLAGS_CXX11=
if test "$COM" = MSC -a "$COM_IS_CLANG" != TRUE; then
- CXXFLAGS_CXX11='-std:c++17 -Zc:__cplusplus'
+ if test "$with_latest_c__" = yes; then
+ CXXFLAGS_CXX11=-std:c++latest
+ else
+ CXXFLAGS_CXX11=-std:c++17
+ fi
+ CXXFLAGS_CXX11="$CXXFLAGS_CXX11 -Zc:__cplusplus"
elif test "$GCC" = "yes" -o "$COM_IS_CLANG" = TRUE; then
- my_flags='-std=c++20 -std=c++2a -std=c++17 -std=c++1z'
+ my_flags='-std=c++17 -std=c++1z'
+ if test "$with_latest_c__" = yes; then
+ my_flags='-std=c++20 -std=c++2a $my_flags'
+ fi
for flag in $my_flags; do
if test "$COM" = MSC; then
flag="-Xclang $flag"
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