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[patch #8613] Simplify _AX_CXX_COMPILE_STDCXX_11_testbody

From: anonymous
Subject: [patch #8613] Simplify _AX_CXX_COMPILE_STDCXX_11_testbody
Date: Fri, 27 Feb 2015 17:25:54 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:36.0) Gecko/20100101 Firefox/36.0


                 Summary: Simplify _AX_CXX_COMPILE_STDCXX_11_testbody
                 Project: GNU Autoconf Archive
            Submitted by: None
            Submitted on: Fri 27 Feb 2015 05:25:53 PM UTC
                Priority: 5 - Normal
                  Status: None
             Assigned to: None
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any



IIUC the _AX_CXX_COMPILE_STDCXX_11_testbody macro from
m4/am_cxx_compile_stdcxx_11.m4 tests for C++11 conformance via a number of
C++11 tricks. I think it would be simpler to just test the __cplusplus macro
against its C++11 value.

static_assert(__cplusplus >= 201103L, "C++11?");

I reckon GCC had an issue with this macro for a very long time, but IIUC it's
now resolved, and we can rely on it at least for values greater or equal to
that of C++11.

I also think this change would make it easier to support checking for newer
standards, like checking for the compliance of C++14. Its value for
__cplusplus is 201402L, so it would be as simple as changing the static assert
for that.


File Attachments:

Date: Fri 27 Feb 2015 05:25:53 PM UTC  Name:
0001-ax_cxx_compile_stdcxx_11-simplify-c-std-check.patch  Size: 2kB   By: None



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