I d like to compile a fortran code with gfortran so that it will work on both Mac OS X 10.5 and 10.6. Is there a way to do this? I tried compiling on 10.6 and get this message when I run the executable on 10.5:
dyld: unknown required load command 0x80000022 Trace/BPT trap
What version of 10.5 are you on? According to this (0x22) is a dynamic load function that got added at 10.5.6. You could try upgrading to >10.5.6 and see if the problem persists.
Also where did you get your gfortran from? In the numpy community the ones from att.com are highly recommended and the builds from hpc are generally to be avoided.
The application was incorrectly built on OS X 10.6 machine for a 10.5 machine. The developer can fix this by considering three things:
Using the correct compiler parameters:
gcc-4.2 -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk ...
Using the correct linker settings (setting environment variable before link command). This is required, so that the OS X 10.6 linker will not use the loader command LC_DYLD_INFO_ONLY (=0x80000022), because OS X 10.5 does not understand this command:
export MACOSX_DEPLOYMENT_TARGET=10.5
(or setenv MACOSX_DEPLOYMENT_TARGET=10.5)
After this is fixed, one can check if the application was correctly built for OS X 10.5 by running otool :
otool -l binary
The correct binary should not contain any LC_DYLD_INFO_ONLY load commands (only LC_DYLD_INFO commands).
(also see my blog article http://grauonline.de/wordpress/?p=71 )
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