I have posted a message to Apple's forums to see if there's any luck: https://developer.apple.com/forums/thread/689991
Aleix On Sat, Sep 11, 2021 at 10:14 PM Aleix Conchillo Flaqué <aconchi...@gmail.com> wrote: > > I did a little bit more research. The combination that actually fails > is RTLD_LAZY | RTLD_GLOBAL (what guile uses). So, you can actually > use: > > - RTLD_LAZY | RTLD_GLOBAL > - RTLD_NOW | RTLD_GLOBAL > - RTLD_NOW | RTLD_LOCAL > > I found the source code of dyld > > https://opensource.apple.com/source/dyld/dyld-852.2/ > > But I have no clue how to build this, I tried it but failed with > missing dependencies. In any case, I provided a patch so at least we > can use Guile on macOS. > > Best, > > Aleix > > On Sat, Sep 4, 2021 at 10:48 PM Aleix Conchillo Flaqué > <aconchi...@gmail.com> wrote: > > > > Hi, > > > > I'm trying to load guile-grcypt with guile 3.0.7 and after my previous > > fix > > (https://git.savannah.gnu.org/cgit/guile.git/commit/?id=1f100a4f20c3a6e57922fb26fce212997e2a03cb) > > guile-gcrypt still does not load properly. > > > > TLDR; Using RTLD_LOCAL instead of RTLD_GLOBAL (default) causes issues on > > macOS. > > > > https://git.savannah.gnu.org/cgit/guile.git/tree/module/system/foreign-library.scm#n181 > > > > In the case of guile-gcrypt this is what I'm getting: > > > > ------------------------- > > scheme@(guile-user)> (use-modules (gcrypt hmac)) > > dyld: lazy symbol binding failed: Symbol not found: __gcry_check_version > > Referenced from: /usr/local/lib/libgcrypt.dylib > > Expected in: flat namespace > > > > dyld: Symbol not found: __gcry_check_version > > Referenced from: /usr/local/lib/libgcrypt.dylib > > Expected in: flat namespace > > ------------------------- > > > > Looking at gcrypt symbols I can see: > > > > ❯ nm -gU /usr/local/lib/libgcrypt.dylib | grep gcry_check_version > > 0000000000005954 T __gcry_check_version > > 0000000000002aa7 T _gcry_check_version > > > > Actually in libgcrypt the public functions are: gcry_check_version and > > _gcry_check_version (no extra underscore). I think extra underscores > > are automatically added when building the library but I'm not sure why > > and when and what systems. And when you call dlsym() you don't need to > > add those extra underscores. > > > > The following code (which uses RTLD_GLOBAL) works fine: > > > > ./a.out gcry_check_version > > > > ------------------------- > > #include <dlfcn.h> > > #include <stdio.h> > > > > int > > main(int argc, char *argv[]) > > { > > char* (*fptr)(char *); > > void *handle = dlopen("/usr/local/lib/libgcrypt.dylib", RTLD_LAZY | > > RTLD_GLOBAL); > > if (handle == NULL) { > > printf("OOOPS: %s\n", dlerror()); > > } else { > > *(void **)(&fptr) = dlsym(handle, argv[1]); > > if (fptr == NULL) { > > printf("NOT FOUND: %s : %s\n", argv[1], dlerror()); > > } else { > > printf("FOUND: %s %s\n", argv[1], (*fptr)(NULL)); > > } > > } > > return 0; > > } > > ------------------------- > > > > But if we change to RTLD_LOCAL we get a crash like in guile's case. > > > > Sorry for being too vague but I'm not familiar with how all this > > works. All I know is that using RTLD_GLOBAL fixes the issue. > > > > Also, from dlopen man page I read: > > > > ------------------------- > > RTLD_GLOBAL Symbols exported from this image (dynamic library or > > bundle) will be available to any images build with -flat_namespace > > option to > > ld(1) or to calls to dlsym() when using a special handle. > > > > RTLD_LOCAL Symbols exported from this image (dynamic library or > > bundle) are generally hidden and only availble to dlsym() when > > directly using > > the handle returned by this call to dlopen(). > > ------------------------- > > > > But I don't fully get what this means. > > > > Any help would be really appreciated. > > > > Thank you, > > > > Aleix
