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autoconf: Fix C++17 detection not working on Ubuntu 16.04.

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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)
This commit is contained in:
Niklas Hambüchen 2019-07-01 19:04:03 +02:00
parent 1f97b16b1d
commit 57daa860e8
4 changed files with 989 additions and 2 deletions
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3
configure.ac
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@ -1,4 +1,5 @@
AC_INIT(nix, m4_esyscmd([bash -c "echo -n $(cat ./.version)$VERSION_SUFFIX"]))
AC_CONFIG_MACRO_DIRS([m4])
AC_CONFIG_SRCDIR(README.md)
AC_CONFIG_AUX_DIR(config)
@ -62,7 +63,7 @@ CXXFLAGS=
AC_PROG_CC
AC_PROG_CXX
AC_PROG_CPP
AX_CXX_COMPILE_STDCXX_17
AX_CXX_COMPILE_STDCXX_17([noext], [mandatory])
AC_CHECK_TOOL([AR], [ar])