CXX gallivm/lp_bld_debug.lo cc1plus: error: unrecognized command line option "-std=c++11" commit 12187550f9c248e72ed8848e96da8f29f1e3a713 Author: Emil Velikov <emil.velikov@collabora.com> Date: Thu Dec 13 11:56:40 2018 +0000 configure: add CXX11_CXXFLAGS to LLVM_CXXFLAGS Seemingly with LLVM7 and GCC 5.0, the former won't properly advertise -std=c++11 and the latter will choke. dd this temporary workaround, otherwise we'll get errors like: In file included from /usr/include/c++/5/type_traits:35:0, from /usr/lib/llvm-7/include/llvm/Support/type_traits.h:18, from /usr/lib/llvm-7/include/llvm/ADT/Optional.h:22, from /usr/lib/llvm-7/include/llvm/ADT/STLExtras.h:20, from /usr/lib/llvm-7/include/llvm/ADT/StringRef.h:13, from /usr/lib/llvm-7/include/llvm/Target/TargetMachine.h:17, from ../../../src/amd/common/ac_llvm_helper.cpp:36: /usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options. Signed-off-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
what compiler and what version? It wouldn't surprise me if old versions of gcc (Say 4.2) doesn't actually support C++11.
Actually, it looks like std=c++11 was added in GCC 4.7, and before that you had to use std=c++0x. Clang added support for std=c++11 it looks like. https://gcc.gnu.org/projects/cxx-status.html#cxx11 https://clang.llvm.org/cxx_status.html
Given the patch in question explicitly adds CXX11_CXXFLAGS in a section that is only taken into account when llvm is enabled the llvm version would also be relevant. AFAIR the last version before llvm-7 that didn't advertise -std=c++11 was something like llvm-3.9, and there was a patch proposed by Emil that would bump the minimum required version to 5.0 (it didn't land yet, I guess because there was some andorid WIP patch in the series). With that support for -std=c++11 would become a requirement for builds that enable llvm.
AFAICT we probe if the compiler supports -std... before using it. If somehow that's not the case we ought to fix that, or fallback to one that owrks. Patches welcome :-)
I haven't seen any other reports of this, so I'm going to remove it rom the 19.0 blocker. I don't think it's worth it to block the release.
autotools builds have been removed from Mesa. Closing.
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