Fix libraw linking on macOS with sdist

.github/scripts/test-macos-libraw-linking.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+set -euxo pipefail
+
+python -m pip install --upgrade pip
+brew install libraw
+
+# Put Homebrew's LibRaw before setuptools' library_dirs. The bundled build
+# must still link against the LibRaw that it just compiled.
+libraw_prefix=$(brew --prefix libraw)
+export LDFLAGS="-L${libraw_prefix}/lib"
+
+python -m pip wheel . --wheel-dir dist --no-deps
+
+wheel=$(find dist -name 'rawpy-*.whl' -print -quit)
+test -n "${wheel}"
+
+wheel_dir=tmp_macos_libraw_linking
+rm -rf "${wheel_dir}"
+unzip -q "${wheel}" -d "${wheel_dir}"
+
+extensions=("${wheel_dir}"/rawpy/_rawpy*.so)
+test "${#extensions[@]}" -eq 1
+
+dependencies=$(otool -L "${extensions[0]}")
+echo "${dependencies}"
+
+if grep -Fq "${libraw_prefix}/lib/libraw_r" <<<"${dependencies}"; then
+    echo "ERROR: rawpy linked against Homebrew LibRaw instead of the bundled library"
+    exit 1
+fi
+
+grep -Eq '[[:space:]]@rpath/libraw_r\.[0-9]+\.dylib' <<<"${dependencies}"

.github/workflows/ci.yml

@@ -222,6 +222,23 @@ jobs:
         name: wheel-${{ matrix.config.os-name }}-${{ matrix.config.python-arch }}-${{ matrix.config.python-version }}
         path: dist
 
+  test-macos-bundled-libraw-linking:
+    runs-on: macos-15
+    env:
+      HOMEBREW_NO_AUTO_UPDATE: 1
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+
+    - uses: actions/setup-python@v5
+      with:
+        python-version: '3.13'
+
+    - name: Verify bundled LibRaw wins over Homebrew
+      run: .github/scripts/test-macos-libraw-linking.sh
+
   test:
     strategy:
       fail-fast: false

setup.py

@@ -30,6 +30,7 @@
 libraries = ["libraw_r"]
 include_dirs = [numpy.get_include()]  # Always include numpy headers
 library_dirs = []
+extra_objects = []
 extra_compile_args = []
 extra_link_args = []
 define_macros = []
@@ -311,8 +312,15 @@ def unix_libraw_compile():
     # Build from source
     install_dir = get_install_dir()
     include_dirs += [os.path.join(install_dir, "include", "libraw")]
-    library_dirs += [os.path.join(install_dir, "lib")]
-    libraries = ["raw_r"]
+    if isMac or isLinux:
+        # Link the bundled library explicitly so an earlier -L from the Python
+        # configuration or environment cannot select a system LibRaw instead.
+        suffix = ".dylib" if isMac else ".so"
+        libraries = []
+        extra_objects = [os.path.join(install_dir, "lib", "libraw_r" + suffix)]
+    else:
+        library_dirs += [os.path.join(install_dir, "lib")]
+        libraries = ["raw_r"]
     # If building from source, we know we have the config header
     libraw_config_found = True
 else:
@@ -390,6 +398,7 @@ def _copy_bundled_libs(self):
             sources=[os.path.join("rawpy", "_rawpy.pyx")],
             libraries=libraries,
             library_dirs=library_dirs,
+            extra_objects=extra_objects,
             define_macros=define_macros,
             extra_compile_args=extra_compile_args,
             extra_link_args=extra_link_args,