[#19]:svarga:fix, macOS productbuild empty package by using explicit CPack component

Author: steven-varga

.github/workflows/package.yml

@@ -3,6 +3,7 @@ name: Package
 on:
   push:
     tags: ['v*']
+    branches: ['19-fix-macos-productbuild']
 
 permissions:
   contents: write
@@ -213,6 +214,15 @@ jobs:
           cpack -G "${{ matrix.generators }}" \
             -D "CPACK_PACKAGE_FILE_NAME=h5cpp-compiler-${H5CPP_VERSION}-${{ matrix.asset_suffix }}" \
             --config CPackConfig.cmake
+          # macOS guard: productbuild must produce a real payload
+          if [[ "${{ matrix.generators }}" == "productbuild" ]]; then
+            pkg="h5cpp-compiler-${H5CPP_VERSION}-${{ matrix.asset_suffix }}.pkg"
+            size=$(stat -f%z "$pkg" 2>/dev/null || stat -c%s "$pkg" 2>/dev/null)
+            if (( size < 100000 )); then
+              echo "macOS package is suspiciously small (${size} bytes) — likely empty" >&2
+              exit 1
+            fi
+          fi
         env:
           CPACK_DEBIAN_PACKAGE_ARCHITECTURE: ${{ matrix.deb_arch }}
           CPACK_RPM_PACKAGE_ARCHITECTURE: ${{ matrix.rpm_arch }}

CMakeLists.txt

@@ -181,13 +181,14 @@ endif()
 
 # Install directives
 include(GNUInstallDirs)
-install(TARGETS h5cpp DESTINATION ${CMAKE_INSTALL_BINDIR})
-install(FILES h5cpp.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+install(TARGETS h5cpp DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT runtime)
+install(FILES h5cpp.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1 COMPONENT runtime)
 
 # CMake helper modules for consumers
 install(
     DIRECTORY cmake/
     DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/cmake/h5cpp-compiler
+    COMPONENT runtime
     FILES_MATCHING PATTERN "*.cmake"
 )
 
@@ -215,7 +216,11 @@ set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Source code transformation tool for HDF5
 set(CPACK_PACKAGE_CONTACT "steven@vargalabs.com")
 set(CPACK_PACKAGE_LICENSE "MIT")
 set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/COPYRIGHT.txt")
-set(CPACK_MONOLITHIC_INSTALL 1)
+# MONOLITHIC is safe for DEB/RPM, but breaks productbuild on macOS
+# (CMake #18201: empty distribution XML when monolithic + productbuild)
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  set(CPACK_MONOLITHIC_INSTALL 1)
+endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   set(CPACK_PACKAGING_INSTALL_PREFIX "/usr")
@@ -235,6 +240,12 @@ endif()
 
 include(CPack)
 
+cpack_add_component(runtime
+  DISPLAY_NAME "h5cpp-compiler"
+  DESCRIPTION "Source code transformation tool for HDF5 H5CPP library"
+  REQUIRED
+)
+
 option(H5CPP_BUILD_TESTS "Build h5cpp-compiler fixture tests" ON)
 if(H5CPP_BUILD_TESTS)
   enable_testing()