use juliapkg.libjulia() for faster init in juliacall (#782)

Co-authored-by: Christopher Rowley <github.com/cjdoris>

Author: cjdoris

pyproject.toml

@@ -13,7 +13,7 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 requires-python = ">=3.10, <4"
-dependencies = ["juliapkg >=0.1.21, <0.2"]
+dependencies = ["juliapkg >=0.1.24, <0.2"]
 
 [dependency-groups]
 dev = [

pysrc/juliacall/__init__.py

@@ -201,6 +201,8 @@ def args_from_config(config):
         # Find the Julia executable and project
         CONFIG['exepath'] = exepath = juliapkg.executable()
         CONFIG['project'] = project = juliapkg.project()
+        if libpath is None:
+            CONFIG['libpath'] = libpath = juliapkg.libjulia()
     else:
         raise Exception("Both PYTHON_JULIACALL_PROJECT and PYTHON_JULIACALL_EXE must be set together, not only one of them.")
     if (libpath is not None) and (exepath is None):