diff options
| author | Niklas Hambüchen <mail@nh2.me> | 2019-07-01 19:04:03 +0200 |
|---|---|---|
| committer | Niklas Hambüchen <mail@nh2.me> | 2019-07-03 04:32:25 +0200 |
| commit | 57daa860e8ed8432937aeecdcf6b9e952b0481b1 (patch) | |
| tree | 475e9684b4131aaac924f5dc60563ba7f6c5a569 /m4/ax_cxx_compile_stdcxx_17.m4 | |
| parent | 1f97b16b1d9d93e083a4f1436ba002e073cbe379 (diff) | |
autoconf: Fix C++17 detection not working on Ubuntu 16.04.
And probably many other distributions.
Until now, ./configure would fail silently printing a warning
./configure: line 4621: AX_CXX_COMPILE_STDCXX_17: command not found
and then continuing, later failing with a C++ #error saying that some C++11
feature isn't supported (it didn't even get to the C++17 features).
This is because older distributions don't come with the
`AX_CXX_COMPILE_STDCXX_17` m4 macro.
This commit vendors that macro accordingly.
Now ./configure complains correctly:
configure: error: *** A compiler with support for C++17 language features is required.
On Ubuntu 16.04, ./configure completes if a newer compiler is used, e.g. with
gcc-7 from https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
using:
./bootstrap.sh
./configure CXX=g++-7 --disable-doc-gen --with-boost=$(nix-build --no-link '<nixpkgs>' -A boost.dev)
Diffstat (limited to 'm4/ax_cxx_compile_stdcxx_17.m4')
| -rw-r--r-- | m4/ax_cxx_compile_stdcxx_17.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/m4/ax_cxx_compile_stdcxx_17.m4 b/m4/ax_cxx_compile_stdcxx_17.m4 new file mode 100644 index 000000000..a68341717 --- /dev/null +++ b/m4/ax_cxx_compile_stdcxx_17.m4 @@ -0,0 +1,35 @@ +# ============================================================================= +# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_17.html +# ============================================================================= +# +# SYNOPSIS +# +# AX_CXX_COMPILE_STDCXX_17([ext|noext], [mandatory|optional]) +# +# DESCRIPTION +# +# Check for baseline language coverage in the compiler for the C++17 +# standard; if necessary, add switches to CXX and CXXCPP to enable +# support. +# +# This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX +# macro with the version set to C++17. The two optional arguments are +# forwarded literally as the second and third argument respectively. +# Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for +# more information. If you want to use this macro, you also need to +# download the ax_cxx_compile_stdcxx.m4 file. +# +# LICENSE +# +# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu> +# Copyright (c) 2016 Krzesimir Nowak <qdlacz@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 2 + +AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX]) +AC_DEFUN([AX_CXX_COMPILE_STDCXX_17], [AX_CXX_COMPILE_STDCXX([17], [$1], [$2])]) |