Make: Override flags for any Clang compiler

.github/workflows/prerelease.yml

@@ -245,9 +245,6 @@ jobs:
           python -m pip install --upgrade pip
           pip install pytest pytest-repeat numpy
           python -m pip install .
-        env:
-          CC: clang++ # Override to use a C++ compiler for C files
-          CXX: clang++
       - name: Test Python
         run: pytest
 

setup.py

@@ -28,6 +28,7 @@ def get_bool_env_w_name(name: str, preference: bool) -> tuple:
 
 
 is_gcc = False
+is_clang = False
 if is_linux:
     cxx = os.environ.get("CXX")
     if cxx:
@@ -36,6 +37,7 @@ def get_bool_env_w_name(name: str, preference: bool) -> tuple:
             full_path = subprocess.check_output([command, cxx], text=True).strip()
             compiler_name = os.path.basename(full_path)
             is_gcc = ("g++" in compiler_name) and ("clang++" not in compiler_name)
+            is_clang = ("clang++" in compiler_name) and ("g++" not in compiler_name)
         except subprocess.CalledProcessError:
             pass
 
@@ -176,12 +178,12 @@ def get_bool_env_w_name(name: str, preference: bool) -> tuple:
     include_dirs.append("fp16/include")
 
 
-# On MacOS, `setuptools` doesn't properly use the `language="c++"` argument we pass.
+# With Clang, `setuptools` doesn't properly use the `language="c++"` argument we pass.
 # The right thing would be to pass down `-x c++` to the compiler, before specifying the source files.
 # This nasty workaround overrides the `CC` environment variable with the `CXX` variable.
 cc_compiler_variable = os.environ.get("CC")
 cxx_compiler_variable = os.environ.get("CXX")
-if is_macos:
+if is_clang:
     if cxx_compiler_variable:
         os.environ["CC"] = cxx_compiler_variable
 
@@ -227,6 +229,6 @@ def get_bool_env_w_name(name: str, preference: bool) -> tuple:
 )
 
 # Reset the CC environment variable, that we overrode earlier.
-if is_macos:
+if is_clang:
     if cxx_compiler_variable:
         os.environ["CC"] = cc_compiler_variable