32 bits on Snow Leopard : old dylib, dylib paths and xcode

Question

Hello !
I've got a problem with 32 bits on Snow Leopard. I'm unable to change paths inside and old leopard dylib, and i have architecture compilation problems when i compile the dylib and the project that uses it. (i've replaced personal information in the rest of the post)
I want to use libsigc++ (a signal library) in a project but :
- if i use my old leopard compiled dylib of libsigc++, an absolute path is wrong inside the dylib, when i run the application that uses the dylib, i get
Dyld Error Message: Library not loaded:
and the indicated path is wrong (as i see when i do otool -L dylib_file)
but if i do installnametool with the change flag
the path remain the same when i do otool -L dylib_file
in addition, if i do installnametool with the delete_rpath flag
i get installnametool: no LC_RPATH load command with path: ...
- if i try to compile libsigc++ on Snow Leopard, everything seems to work, and when i compile the project that uses the compile libsigc++, i get :
ld: warning: in DYLIB_FILE, file is not of required architecture
I've tried, as i seen on a forum, to compile my dylib with
env CFLAGS=-arch i386 ./configure (with quotes, but it doesn't work here)
env CFLAGS=-arch i386 make (with quotes too)
but the result is the same...
My configuration in XCode is Mac OS 10.5 , i386 , gcc 4.0
So, does anybody have a solution to change my dylib paths or to be sure that my project and my dylib (compiled with configure and make) are really 32 bits ?
Thank u !
Emilien

Answer 1

MeeLoo wrote:
- if i use my old leopard compiled dylib of libsigc++, an absolute path is wrong inside the dylib,
What path is that?
when i run the application that uses the dylib, i get
Dyld Error Message: Library not loaded:
and the indicated path is wrong (as i see when i do otool -L dylib_file)
but if i do installnametool with the change flag
Can you print the exact command you are using?
- if i try to compile libsigc++ on Snow Leopard, everything seems to work, and when i compile the project that uses the compile libsigc++, i get :
ld: warning: in DYLIB_FILE, file is not of required architecture
Have you done a "make clean" on everything in this project? You are only going to get the "file is not of required architecture" if you are mixing architectures. If you do the default options, you shouldn't ever have mixed architectures or that error message.
I've tried, as i seen on a forum, to compile my dylib with
Which forum is that? The internet is a great mixing bowl of misinformation.
env CFLAGS=-arch i386 ./configure (with quotes, but it doesn't work here)
env CFLAGS=-arch i386 make (with quotes too)
First of all, you shouldn't even be using that flag at all. Do "make clean" on everything and get rid of all the options and it should build fine. If you insist on cross-compiling, the correct flags to use are
“-arch i386 -mmacosx-version-min=10.5″ to build a 32-bit version for MacOS X 10.5. You may need to set both CFLAGS and CXXFLAGS, depending on how well the makefile is constructed. If your Makefiles aren't well constructed, setting those flags on the "configure" command line may not work.