Re: [Fink-devel] python26-2.6.8-2 linking wrong libncurses

[Hanspeter N. <fi...@sn...>]

On 2/18/2013 9:26 AM, Jack Howarth wrote:
>     On x86_64 fink 10.6, the new python26-2.6.8-2 build fails with the error...
>
> ld: in /usr/lib/libncurses.5.dylib, missing required architecture x86_64 in file for architecture x86_64
> collect2: ld returned 1 exit status
>
> The problem is that compile line...
>
> gcc -bundle libpython2.6.dylib build/temp.macosx-10.6-x86_64-2.6/sw/src/fink.build/python26-2.6.8-2/Python-2.6.8/Modules/readline.o -lreadline -lncursesw -o build/lib.macosx-10.6-x86_64-2.6/readline.so -I. -IInclude -I./Include -I/sw/include -L/sw/lib/system-openssl/lib -L/sw/lib -L/sw/lib/system-openssl/lib -L/sw/lib -L/sw/lib/system-openssl/lib -L/sw/lib -L/usr/lib/termcap
>
> which is placing -lreadline --lncursesw before any of the instance of -L/sw/lib.

To add to the record, it is more than just the order of -l and -L flags, 
because on 10.7/xcode4.6, this is the linker line (note -L/sw/lib at 
beginning which seems to be set by SetLDFLAGS):

gcc -L/sw/lib/system-openssl/lib -L/sw/lib -bundle libpython2.6.dylib 
-L/sw/lib/system-openssl/lib -L/sw/lib -I. -IInclude -I./Include 
-I/sw/include 
build/temp.macosx-10.7-x86_64-2.6/sw/build.build/python26-2.6.8-2/Python-2.6.8/Modules/readline.o 
-L/usr/lib/termcap -L/sw/lib/system-openssl/lib -L/sw/lib -lreadline 
-lncursesw -o build/lib.macosx-10.7-x86_64-2.6/readline.so

and it gives the same error you see since /usr/lib/libncurses.5.dylib is 
i386 only.  *But* if I downgrade to use our readline5, then the build 
succeeds.  Both of Fink's readline dylibs link to 
/sw/lib/libncurses.5.dylib. So something beyond flag ordering is happening.

Hanspeter

addendum: On a 10.6/x86_64 system here, I get this (with successful 
completion):

gcc -L/sw64/lib/system-openssl/lib -L/sw64/lib -bundle 
libpython2.6.dylib -L/sw64/lib/system-openssl/lib -L/sw64/lib -I. 
-IInclude -I./Include -I/sw64/include 
build/temp.macosx-10.6-x86_64-2.6/sw64/build.build/python26-2.6.8-2/Python-2.6.8/Modules/readline.o 
-L/usr/lib/termcap -L/sw64/lib/system-openssl/lib -L/sw64/lib -lreadline 
-lncursesw -o build/lib.macosx-10.6-x86_64-2.6/readline.so