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Re: Trying to link in modules

From: Kristian Lein-Mathisen
Subject: Re: Trying to link in modules
Date: Sun, 20 Jun 2021 12:35:32 +0200

Hi Kurt,

I think the problem is missing flags and parameters when fuilding a static extension. I'm afraid I don't know exactly what they are, but hopefully I can give some pointers to how you can find them.

chicken-install will extensions first as a shared object, and then as a static one by default.

~/p/t/chicken-mtest > cat mymod.egg
(extension mymod)))                
~/p/t/chicken-mtest > chicken-install -v
/data/data/com.termux/files/home/prj/tmp/chicken-mtest/ -host -D compiling-extension -c -unit mymod -D compiling-static-extension -C -I/data/data/com.termux/files/home/prj/tmp/chicken-mtest -O2 -d1 mymod.scm -o

That gives a lot of output, but notice it installs a mymod.o file that trymod can use when compiled statically. Let's see how trymod behaves as normally:

~/p/t/chicken-mtest > csc trymod.scm   
~/p/t/chicken-mtest > strace ./trymod ^&1 |grep mymod     
newfstatat(AT_FDCWD, "/data/data/com.termux/files/usr/lib/chicken/11/", {st_mode=S_IFREG|0755, st_size=13232, ...}, 0) = 0              newfstatat(AT_FDCWD, "/data/data/com.termux/files/usr/lib/chicken/11/", {st_mode=S_IFREG|0755, st_size=13232, ...}, 0) = 0              openat(AT_FDCWD, "/data/data/com.termux/files/usr/lib/chicken/11/", O_RDONLY|O_CLOEXEC) = 3                                             openat(AT_FDCWD, "/data/data/com.termux/files/usr/lib/chicken/11/", O_RDONLY|O_CLOEXEC) = 3                                             write(1, "Hello, World, I'm in mymod!\n", 28Hello, World, I'm in mymod!                         

And now with static compilation:

~/p/t/chicken-mtest > csc -static trymod.scm
~/p/t/chicken-mtest > strace ./trymod ^&1 |grep mymod
write(1, "Hello, World, I'm in mymod!\n", 28Hello, World, I'm in mymod!

I hope that is what you're after. Note this uses the installed version of mymod (chicken-status), not the one in PWD. You can inspect the * files that chicken-install produces for inspiration, or tweak the .egg-file to suit your needs.


On Sun, Jun 20, 2021, 09:57 T. Kurt Bond <> wrote:
I've got a module mymod in mymod.scm:
(module mymod (hello)
  (import scheme)
  (define (hello)
    (display "Hello, World, I'm in mymod!")
and I've got a module trymod in trymod.scm:
(module trymod ()
  (import scheme)
  (import mymod)
and when I compile them like this:
csc -s -J mymod.scm
csc -s mymod.import.scm
csc trymod.scm
it produces an executable trymod that runs and dynamically loads, unloads it, and loads it again, then produces the expected output, calling the function hello in mymod as running it on macOS with DYLD_PRINT_LIBRARIES=YES ./trymod shows.
dyld: loaded: <59A8239F-C28A-3B59-B8FA-11340DC85EDC> /usr/lib/libc++.1.dylib
dyld: loaded: <EBB10A36-BF4E-3C83-9B63-9D26028D43B9> ./
dyld: unloaded: <EBB10A36-BF4E-3C83-9B63-9D26028D43B9> ./
dyld: loaded: <EBB10A36-BF4E-3C83-9B63-9D26028D43B9> ./
Hello, World, I'm in mymod!
 However, I can't figure out how to do the same thing with mymod as non-shared objects.   I tried 
csc -c -J mymod.scm
csc -c mymod.import.scm
csc -static -o trymod.static mymod.o mymod.import.o trymod.scm
but I got
Undefined symbols for architecture x86_64:
  "_C_mymod_toplevel", referenced from:
      _f_138 in trymod.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: shell command terminated with non-zero exit status 256: 'clang' 'mymod.import.o' 'mymod.o' 'trymod.o' -o 'trymod.static' -m64 -L/usr/local/Cellar/chicken/5.2.0/lib /usr/local/Cellar/chicken/5.2.0/lib/libchicken.a -lm

What am I doing wrong?

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