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[patch #9943] Update ax_prog_cxx_for_build.m4

From: Max Horn
Subject: [patch #9943] Update ax_prog_cxx_for_build.m4
Date: Wed, 17 Jun 2020 04:58:10 -0400 (EDT)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15


                 Summary: Update ax_prog_cxx_for_build.m4
                 Project: GNU Autoconf Archive
            Submitted by: fingolfin
            Submitted on: Wed 17 Jun 2020 10:58:09 AM CEST
                Priority: 5 - Normal
                  Status: None
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



... to match changes made to ax_prog_cc_for_build.m4 recently.

- save/restore GXX
- honor `./configure --build=BUILD`
- use AC_LANG_PUSH and AC_LANG_POP to save and restore global variables
  used for running tests like ac_compile and ac_link
- use pushdef/popdef to save and restore ac_tool_prefix, cross_compiling
  and am_cv_CXX_dependencies_compiler_type (not sure if we need the latter
  but this mimicks what AX_PROG_CC_FOR_BUILD does)


File Attachments:

Date: Wed 17 Jun 2020 10:58:09 AM CEST  Name:
0001-Update-ax_prog_cxx_for_build.m4.patch  Size: 3KiB   By: fingolfin



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