Re: [Fink-users] Many packages do not properly test for gcc-4.2 vs. llvm-gcc-4.2

On 1/7/12 1:40 PM, Matthew Bogosian wrote:
> Many packages employ one the following (assumptive) tests to see if
> gcc 4.2 is available:
> 
>> ... if test "$darwin_vers" = 9 ; then export CC=gcc-4.2 export
>> CXX=g++-4.2 ...

That's perfectly acceptable.  Note that this is darwin_9_, i.e. OS
10.5, where (gcc|g++)-4.2 are available (for Xcode >= 3.1).

> 
> -or-
> 
>> ... if [ "%m" == "x86_64" ]; then export CC=gcc-4.2 ...
> 
> This does not play well with llvm-based versions of Xcode (i.e.,
> the above tests will succeed, but the subsequent builds will fail
> because they can't find an executable named gXX-4.2). It's best to
> test whether gXX-4.2 is callable before assuming it can be used
> (most packages do this already).
> 
> The attached is probably both underinclusive and overinclusive, but
> it's a pretty good start. The output is edited from the following:
> 
>> find /sw/fink/10.4 -name \*.info | xargs grep >|~/Desktop/out.txt
>> -C 2 -n '[="'\'']g[c+][c+]-4\.2'
> 
> Creating symlinks somewhere in $PATH may help with some packages.
> E.G.:
> 
>> for i in /usr/bin/llvm-*-4.2 ; do j="$(basename "${i}")" ; echo
>> ln -s "${i}" "[e.g., /sw/bin]/${j#llvm-}" ; done
> 
> I hope this helps.
> 
> 
> --Matt
> 
> 
> 

(cc-ing fink-core)

Here are 2 options:

1)  Packages which use "gcc-4.2" should all be fixed by their
maintainers or others.

2)  We could provide appropriately directed "gcc-4.2" and "g++-4.2"
compiler wrappers as part of fink on 10.6 (basically the symlinks idea
above).

-- 
Alexander Hansen, Ph.D.
Fink User Liaison
http://finkakh.wordpress.com/

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