* add pymake function to add syslibs option for Darwin + gcc toolchai…

…n + CLT > 14.*

autotest/test_build.py

@@ -70,8 +70,8 @@ def test_build(function_tmpdir, target: str) -> None:
         pm.target = target
         pm.inplace = True
         fc = os.environ.get("FC", "gfortran")
-        if system() == "Darwin" and fc == "gfortran":
-            pm.syslibs = "-Wl,-ld_classic"
+        # if system() == "Darwin" and fc == "gfortran":
+        #     pm.syslibs = "-Wl,-ld_classic"
         assert (
             pymake.build_apps(
                 target,
@@ -116,8 +116,8 @@ def test_makefile_build(function_tmpdir, target: str) -> None:
     pm.dryrun = True
     pm.makeclean = False
     fc = os.environ.get("FC", "gfortran")
-    if system() == "Darwin" and fc == "gfortran":
-        pm.syslibs = "-Wl,-ld_classic"
+    # if system() == "Darwin" and fc == "gfortran":
+    #     pm.syslibs = "-Wl,-ld_classic"
 
     with set_dir(function_tmpdir):
         pm.download_target(target)

autotest/test_cli_cmds.py

@@ -1,11 +1,11 @@
 import os
 import pathlib as pl
 import subprocess
+from platform import system
 
 import pytest
 from flaky import flaky
 from modflow_devtools.misc import set_dir, set_env
-from platform import system
 
 RERUNS = 3
 

autotest/test_gridgen.py

@@ -32,8 +32,8 @@ def pm(module_tmpdir, target) -> pymake.Pymake:
     pm.appdir = str(module_tmpdir)
     pm.cc = environ.get("CXX", "g++")
     pm.fc = None
-    if system() == "Darwin" and pm.cc == "g++":
-        pm.syslibs = "-Wl,-ld_classic"
+    # if system() == "Darwin" and pm.cc == "g++":
+    #     pm.syslibs = "-Wl,-ld_classic"
     pm.inplace = True
     pm.makeclean = True
     yield pm

autotest/test_mf6_existing_meson.py

@@ -37,8 +37,8 @@ def pm(workspace, targets) -> pymake.Pymake:
     pm.target = str(targets[0])
     pm.appdir = str(workspace / "bin")
     pm.fc = os.environ.get("FC", "gfortran")
-    if system() == "Darwin" and pm.fc == "gfortran":
-        pm.syslibs = "-Wl,-ld_classic"
+    # if system() == "Darwin" and pm.fc == "gfortran":
+    #     pm.syslibs = "-Wl,-ld_classic"
     pm.meson = True
     pm.makeclean = True
     pm.mesondir = str(workspace)

pymake/utils/_compiler_switches.py

@@ -4,6 +4,7 @@
 
 import os
 import sys
+from subprocess import check_output
 
 from ._compiler_language_files import (
     _get_c_files,
@@ -970,6 +971,10 @@ def _set_syslibs(
     # set default syslibs
     if default_syslibs:
         syslibs.append("-lc")
+
+    darwin_options = _darwin_syslibs(cc, fc, verbose)
+    if darwin_options is not None:
+        syslibs.append(darwin_options)
 
     # add additional syslibs for select programs
     if target == "triangle":
@@ -1033,3 +1038,43 @@ def _get_os_macro(osname=None):
     else:
         os_macro = None
     return os_macro
+
+
+def _darwin_syslibs(cc, fc, verbose=False):
+    """Get additional syslibs for Darwin systems using gcc
+       tool chain and command line tools greater than 14
+
+    Parameters
+    ----------
+    cc : str
+        c compiler
+    fc : str
+        fortran compiler
+    verbose : bool
+        boolean for verbose output to terminal
+
+    Returns
+    -------
+    linker_str : str
+        additiona; linker flags for darwin systems. Default is None
+    """
+    linker_str = None
+    if _get_osname() == "darwin":
+        if cc in ("gcc", "g++",) or fc in ("gfortran",):
+            cmd = ["pkgutil",  "--pkg-info=com.apple.pkg.CLTools_Executables"]
+            out_lines = check_output(cmd).decode("utf-8").splitlines()
+            version = None
+            tag = "version: "
+            for line in out_lines:
+                if line.startswith(tag):
+                    version = line.replace(tag, "")
+                    break
+            if version is not None:
+                major = int(version.split(".")[0])
+            if major > 14:
+                linker_str = "-Wl,-ld_classic"
+            if verbose:
+                print(f"C/C++ compiler: {cc} \nFortran compiler: {fc}")
+                print(f"Command line tools version: {version}")
+                print(f"Command line tools major version number: {major}")
+    return linker_str