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57daa860e8
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)
36 lines
1.4 KiB
Text
36 lines
1.4 KiB
Text
# =============================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_17.html
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# =============================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_COMPILE_STDCXX_17([ext|noext], [mandatory|optional])
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#
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# DESCRIPTION
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#
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# Check for baseline language coverage in the compiler for the C++17
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# standard; if necessary, add switches to CXX and CXXCPP to enable
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# support.
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#
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# This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
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# macro with the version set to C++17. The two optional arguments are
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# forwarded literally as the second and third argument respectively.
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# Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
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# more information. If you want to use this macro, you also need to
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# download the ax_cxx_compile_stdcxx.m4 file.
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#
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# LICENSE
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#
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# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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# Copyright (c) 2016 Krzesimir Nowak <qdlacz@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 2
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AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX])
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AC_DEFUN([AX_CXX_COMPILE_STDCXX_17], [AX_CXX_COMPILE_STDCXX([17], [$1], [$2])])
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