I have compiled the COCAL code separately from the ET, generating a library for which I have the .a file. I’m trying to link to that library when compiling the ET on Expanse. When I try to link it without copying all the source files in the thorn that uses it into the src directory I get “undefined reference to” errors for anything in a subdirectory. I tried moving all the files in subdirectories into the src directory as a work-around, but then I started getting errors that look like this:

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```

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/lib/../lib64/crt1.o: In function `_start':

(.text+0x24): undefined reference to `main'

collect2: error: ld returned 1 exit status

make[3]: *** [<builtin>: include_modulefiles_MRNS.f90] Error 1

make[2]: *** [/home/mmutz/Cactus/lib/make/make.thornlib:113: make.checked] Error 2

make[1]: *** [/home/mmutz/Cactus/lib/make/make.configuration:179: /home/mmutz/Cactus/configs/sim17/lib/libthorn_Cocalthorn.a] Error 2

```

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What is the proper way to link the library during compilation?

I’ve attached a copy of my config file.

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attachment:

OptionList.pdf

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2679/how-to-link-an-externally-compiled-library