I think it's a new autotools bug. It certainly should set CXXFLAGS
appropriately, but doesn't. And we've not changed that part of configure.ac.
It also happens to be the same as in GMP, which does get the right CXXFLAGS.

Fortunately I have to issue the release with a different version of
autotools anyway, as the Ubuntu version doesn't support Windows, etc.

So perhaps you can check again when I do that.

Bill.


On 28 March 2014 21:43, leif <not.rea...@online.de> wrote:

> On 28.03.2014 19:36, Bill Hart wrote:
>
>> I've added it to the list.
>>
>> I'm puzzled as to how this bug has lasted until now to be reported. It
>> must surely have broken things on a lot of C++ platforms, and it almost
>> certainly has never been right.
>>
>
> With MPIR 2.6.0 (and presumably [m]any earlier version[s]) this worked for
> me (although I usally set CXXFLAGS manually, so wouldn't notice unless I'm
> explicitly testing or compiling the C++ interface for a non-default ABI):
>
> ...
> checking ABI=64
> checking whether gcc-4.7.0 is gcc... yes
> checking compiler gcc-4.7.0 -m64 ... yes
> checking compiler gcc-4.7.0 -m64  -O2... yes
> checking compiler gcc-4.7.0 -m64 -O2  -march=btver1... yes
> checking compiler gcc-4.7.0 -m64 -O2 -march=btver1  -mtune=btver1... yes
> checking for gcc... gcc-4.7.0
> checking whether the C compiler works... yes
> checking for C compiler default output file name... a.out
> checking for suffix of executables...
> checking whether we are cross compiling... no
> checking for suffix of object files... o
> checking whether we are using the GNU C compiler... yes
> checking whether gcc-4.7.0 accepts -g... yes
> checking for gcc-4.7.0 option to accept ISO C89... none needed
> ...
> checking for gcc... (cached) gcc-4.7.0
> checking whether we are using the GNU C compiler... (cached) yes
> checking whether gcc-4.7.0 accepts -g... (cached) yes
> checking for gcc-4.7.0 option to accept ISO C89... (cached) none needed
> checking for gcc-4.7.0 option to accept ISO C99... -std=gnu99
> checking for gcc-4.7.0 -std=gnu99 option to accept ISO Standard C...
> (cached) -std=gnu99
> checking how to run the C preprocessor... cpp-4.7.0
> checking build system compiler gcc-4.7.0 -std=gnu99... yes
> checking for build system preprocessor... gcc-4.7.0 -std=gnu99 -E
> checking for build system executable suffix...
> checking whether build system compiler is ANSI... yes
> checking for build system compiler math library... -lm
> checking whether we are using the GNU C++ compiler... yes
> checking whether g++-4.7.0 accepts -g... yes
> checking C++ compiler g++-4.7.0  -m64 -O2 -march=btver1 -mtune=btver1...
> yes
> checking how to run the C++ preprocessor... g++-4.7.0 -E
> using ABI="64"
>       CC="gcc-4.7.0 -std=gnu99"
>       CFLAGS="-m64 -O2 -march=btver1 -mtune=btver1"
>       CPPFLAGS=""
>       CXX="g++-4.7.0"
>       CXXFLAGS="-m64 -O2 -march=btver1 -mtune=btver1"
>       MPN_PATH=" x86_64/bobcat x86_64 generic"
> ...
>
>
> -leif
>
>
>  On 28 March 2014 18:42, leif <not.rea...@online.de
>> <mailto:not.rea...@online.de>> wrote:
>>
>>
>>     On 24.03.2014 17 <tel:24.03.2014%2017>:17, Bill Hart wrote:
>>
>>         I have now assigned 36 open tickets to the 2.7 release. I'm sure
>>         more
>>         will be added, but at least we now have some measure of how far
>>         we are
>>         from a release.
>>
>>
>>     Just in case that's not yet on the todo list:
>>
>>     While --enable-cxx (and 'make check' with that) meanwhile works,
>>     apparently the checks for the C++ compiler's capabilities are
>>     currently missing, such that CXXFLAGS lack the ABI- and
>>     machine-specific flags (-m32/-m64, -march=.../-mtune=...).
>>
>
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