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From: Andrea Venturoli on 6 Apr 2010 02:14
On 04/06/10 00:26, Thierry Thomas wrote:
> Le Mar 23 mar 10 à 22:37:24 +0100, Andrea Venturoli<ml(a)netfence.it>
> écrivait :
>> Just to let you know this used to work on 6.3, though I cannot test it
>> anymore now.
>>
>> I can compile it without any problem on 7.2/i386, though I remove
>> "USE_FORTRAN=yes".
>>
>> The latter is to avoid compilation with gcc4.4, which will lead to
>> incompatibilities with other libraries (such as boost) I use on a
>> project of mine.
>
> It should be fixed now.
>
> Actually, it used to work untill gcc-4.4.4.20100216. Gcc-44 is needed
> because f77 has been removed from the base.

Are you sure OpenCASCADE requires f77?
I looked into the source and didn't find any file like "*.f" or "*.for",
although of course they might have other extension or be generated
during the build process.
Also I can confirm it compiles with the base system gcc, although I
don't remember if I had gcc44 installed at the time, so it might also be
it picked f77 from gcc44 anyway.



The whole point of the above is that, due to gcc44's libstdc++ recently
becoming incompatible with older versions, if you mix different g++
versions in the same project, you'll get "Undefined symbol" errors when
starting your executable.

In my case, I'm linking (amongst others) against Boost and OpenCASCADE,
so I need them to use the same compiler (and use that myself).



Again, this is not a problem with OpenCASCADE only, but potentially
affects any C++ library which is build with gcc44.



bye & Thanks
av.
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From: Thierry Thomas on 10 Apr 2010 10:20
Le Mar 6 avr 10 � 8:14:57 +0200, Andrea Venturoli <ml(a)netfence.it>
�crivait�:

> Are you sure OpenCASCADE requires f77?
> I looked into the source and didn't find any file like "*.f" or "*.for",
> although of course they might have other extension or be generated
> during the build process.
> Also I can confirm it compiles with the base system gcc, although I
> don't remember if I had gcc44 installed at the time, so it might also be
> it picked f77 from gcc44 anyway.

You're right: it builds succesfully in a tinderbox without USE_FORTRAN,
which is just searched by configure.
Should be some remaining of an older version...

> The whole point of the above is that, due to gcc44's libstdc++ recently
> becoming incompatible with older versions, if you mix different g++
> versions in the same project, you'll get "Undefined symbol" errors when
> starting your executable.
>
> In my case, I'm linking (amongst others) against Boost and OpenCASCADE,
> so I need them to use the same compiler (and use that myself).
>
>
>
> Again, this is not a problem with OpenCASCADE only, but potentially
> affects any C++ library which is build with gcc44.

True: that's why I think that libtool should'nt force $CC and $LD.

Best regards,
--
Th. Thomas.
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