[BuildTools] Problem with ASL and AC_CHECK_SIZEOF(long long)

[Andreas Waechter]

Hi Kipp,

The name of the cache variable should be

ac_cv_sizeof_long_long

and I get you can somehow unset it if you need to.  Have a look at the 
configure file that is generated for your configure.ac file - maybe that 
gives you some hints.

Cheers

Andreas

On Mon, 11 Feb 2008, Kipp Martin wrote:

> Hi Lou:
>
>>
>> 	As is often the case, I'm confused.
>
> I have that effect on people including myself.
>
>>
>> 	All of the various type checks in Coin configure scripts are performed
>> using C in order to avoid issues with Microsoft C++.  I'm extremely surprised
>> that the size of long long would differ between C and C++.  I thought this was
>> illegal.  Add to that, I always build with configure -C, and I've never run into
>> this issue.
>
> My understanding from a number of Google sources is that indeed long
> long is 8 bytes in C and not defined in C++.  See for example,
>
> http://gcc.gnu.org/ml/gcc/2003-08/msg00847.html
>
> If you do an AC_CHECK_SIZEOF(long long) in the ASL configure.ac you will
> have an 8 returned. However, if you do AC_CHECK_SIZEOF(long long) in the
> OS configure.ac (without -C when you configure) you will have 0 returned.
>
>
>>
>> 	Building on SPARC / Solaris 10 / Studio, configure, make, make test is
>> successful.
>>
>> 	I notice you've added a check for long long in the top-level
>
> If you look at OS release 1617 the check for long long should not be in
> the top level config.ac file.
>
>> configure.ac.  Should I remove this to try and replicate the problem? By chance,
>> is this a Mac thing? Some issue with the Mac C++ compiler?
>
> It is not just a Mac thing. I got emails from JP today and it broke two
> of his platforms,  both Intel Linux and Power PC Linux.  I had the same
> problem on mingw/gcc so there are at least three platforms other than
> the Mac where this happens.
>
> Duplicating resutls -- if you want to try to duplicate this, could you
> get the current OS release of 1617 and go into configure.ac in OS and in
> line 83 remove the comment.  If you configure with -C (no other options)
> you should get the error below.
>
> Thanks
>
>
>
>  -lgfortranbegin -lgfortran -lSystem
> checking for dummy main to link with Fortran libraries... (cached) none
> checking for Fortran name-mangling scheme... (cached) lower case,
> underscore, no extra underscore
> checking for egrep... (cached) grep -E
> checking for a BSD-compatible install... (cached) /usr/bin/install -c
> checking whether build environment is sane... yes
> checking for gawk... (cached) awk
> checking whether make sets $(MAKE)... (cached) yes
> checking for style of include used by make... GNU
> checking dependency style of cc... (cached) gcc3
> checking dependency style of g++... (cached) gcc3
> checking whether to enable maintainer-specific portions of Makefiles... no
> configure: Using libtool script in directory ..
> checking whether byte ordering is bigendian... (cached) no
> checking for long long... (cached) yes
> checking size of long long... configure: error: cannot compute sizeof
> (long long), 77
> See `config.log' for more details.
>>
>> 							Lou
>>
>>
>> ------------- End Forwarded Message -------------
>>
>>
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>
> -- 
> Kipp Martin
> Professor of Operations Research
> and Computing Technology
> Graduate School of Business
> University of Chicago
> 5807 South Woodlawn Avenue
> Chicago, IL 60637
> 773-702-7456
> kipp.martin at chicagogsb.edu
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