driver: Fix pkg-config dependency list generation (#61)

Tested on Linux. pkg-config is also generated on macOS, but this is
untested for now. The main use case is for Linux anyway.

driver/CMakeLists.txt

@@ -10,6 +10,7 @@ option(LPAC_WITH_HTTP_CURL "Build HTTP Curl interface" ON)
 aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR} DIR_INTERFACE_SRCS)
 if(LPAC_DYNAMIC_DRIVERS)
     add_library(euicc-drivers SHARED ${DIR_INTERFACE_SRCS})
+    list(APPEND LIBEUICC_DRIVERS_REQUIRES "libeuicc = ${PROJECT_VERSION}")
 else()
     add_library(euicc-drivers STATIC ${DIR_INTERFACE_SRCS})
 endif()
@@ -26,9 +27,16 @@ if(LPAC_WITH_APDU_PCSC)
         target_link_libraries(euicc-drivers winscard)
     elseif(APPLE)
         target_link_libraries(euicc-drivers "-framework PCSC")
+        if(LPAC_DYNAMIC_DRIVERS)
+            # for pkg-config
+            set(LIBEUICC_DRIVERS_EXTRA_CFLAGS "-framework PCSC")
+        endif()
     else()
         find_package(PCSCLite)
         target_link_libraries(euicc-drivers PCSCLite::PCSCLite)
+        if(LPAC_DYNAMIC_DRIVERS)
+            list(APPEND LIBEUICC_DRIVERS_REQUIRES "libpcsclite")
+        endif()
     endif()
 endif()
 
@@ -44,6 +52,10 @@ if(LPAC_WITH_APDU_GBINDER)
     pkg_check_modules(GBINDER REQUIRED IMPORTED_TARGET libgbinder)
     pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
     target_link_libraries(euicc-drivers PkgConfig::GBINDER PkgConfig::GLIB)
+    if(LPAC_DYNAMIC_DRIVERS)
+        list(APPEND LIBEUICC_DRIVERS_REQUIRES "libgbinder")
+        list(APPEND LIBEUICC_DRIVERS_REQUIRES "glib-2.0")
+    endif()
 endif()
 
 if(LPAC_WITH_HTTP_CURL)
@@ -54,6 +66,9 @@ if(LPAC_WITH_HTTP_CURL)
     else()
         find_package(curl)
         target_link_libraries(euicc-drivers curl)
+        if(LPAC_DYNAMIC_DRIVERS)
+            list(APPEND LIBEUICC_DRIVERS_REQUIRES "libcurl")
+        endif()
     endif()
 endif()
 
@@ -66,9 +81,12 @@ if(LPAC_DYNAMIC_DRIVERS)
         endif()
     endforeach()
     set_target_properties(euicc-drivers PROPERTIES PUBLIC_HEADER "${ALL_HEADERS}")
-    # Install a pkg-config file
-    configure_file(libeuicc-drivers.pc.in libeuicc-drivers.pc @ONLY)
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libeuicc-drivers.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+    # Install a pkg-config file (mainly for Linux; macOS is untested; Win32 is not supported)
+    if(UNIX)
+        list(JOIN LIBEUICC_DRIVERS_REQUIRES ", " LIBEUICC_DRIVERS_REQUIRES)
+        configure_file(libeuicc-drivers.pc.in libeuicc-drivers.pc @ONLY)
+        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libeuicc-drivers.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+    endif()
     set_target_properties(euicc-drivers PROPERTIES SOVERSION ${PROJECT_VERSION_MAJOR})
     install(TARGETS euicc-drivers LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                           PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/euicc)

driver/libeuicc-drivers.pc.in

@@ -6,6 +6,6 @@ includedir="${prefix}/include"
 Name: libeuicc-drivers
 Description: An "official" collection of drivers (backends) and their loader for use with libeuicc
 Version: @PROJECT_VERSION@
-Requires: libeuicc = @PROJECT_VERSION@
-Cflags: -I${includedir}
+Requires: @LIBEUICC_DRIVERS_REQUIRES@
+Cflags: -I${includedir} @LIBEUICC_DRIVERS_EXTRA_CFLAGS@
 Libs: -L${libdir} -leuicc-drivers