build: generate a pkgconf pc file from cmake (#1565)

CMakeLists.txt

@@ -460,3 +460,34 @@ install(EXPORT FMSExports
   NAMESPACE FMS::
   FILE fms-targets.cmake
   DESTINATION ${CONFIG_INSTALL_DESTINATION})
+
+# pkgconf
+set(prefix ${CMAKE_INSTALL_PREFIX})
+set(exec_prefix ${CMAKE_INSTALL_PREFIX})
+set(libdir ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
+set(includedir ${CMAKE_INSTALL_PREFIX}/${includeDir})
+
+set(CC ${CMAKE_C_COMPILER})
+set(FC ${CMAKE_Fortran_COMPILER})
+set(CFLAGS "${CMAKE_C_FLAGS} ${CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE}}")
+set(CPPFLAGS "${CMAKE_CPP_FLAGS} ${CMAKE_CPP_FLAGS_${CMAKE_BUILD_TYPE}}")
+set(FCFLAGS "${CMAKE_Fortran_FLAGS} ${CMAKE_Fortran_FLAGS_${CMAKE_BUILD_TYPE}}")
+set(LDFLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS_${CMAKE_BUILD_TYPE}}")
+
+set(VERSION ${PROJECT_VERSION})
+
+# TODO: If FMS depends on a library that is built as a static library, it
+#       should be listed here as an ldflag.
+set(LIBS "")
+
+if(NOT ${NetCDF_Fortran_LIBRARY_SHARED})
+  # autotools: Libs.private: -lnetcdff -lnetcdf
+  string(APPEND LIBS ${NetCDF_Fortran_LIBRARIES})
+endif()
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/FMS.pc.in
+               ${CMAKE_CURRENT_BINARY_DIR}/FMS.pc @ONLY)
+
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/FMS.pc
+              DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+              COMPONENT utilities)

FMS.pc.in

@@ -35,7 +35,7 @@ Name: FMS
 Description: The Flexible Modeling System Infrastructure Library
 URL: https://www.gfdl.noaa.gov/fms
 Version: @VERSION@
-Libs: -L$(libdir) -lFMS
+Libs: -L${libdir} -lFMS
 Libs.private: @LIBS@
 Cflags: -I${includedir}
 Fflags: -I${includedir}