fix #120: pkg-config 'Requires:' missing libsasl2

Author: m6w6

CMake/_Include.cmake

@@ -100,12 +100,21 @@ include(CheckThreads)
 include(CheckVisibility)
 include(InstallPublicHeaders)
 
+function(pkgconfig_export VAR VAL)
+    get_property(PREV GLOBAL PROPERTY PKGCONFIG_${VAR})
+    set_property(GLOBAL PROPERTY PKGCONFIG_${VAR} "${PREV} ${VAL}")
+endfunction()
+macro(pkgconfig_import VAR)
+    get_property(PKGCONFIG_${VAR} GLOBAL PROPERTY PKGCONFIG_${VAR})
+endmacro()
+
 ## sasl
 configure_define_01(LIBMEMCACHED_WITH_SASL_SUPPORT)
 if(ENABLE_SASL)
     check_dependency(LIBSASL sasl2)
     if(HAVE_LIBSASL)
         set(LIBMEMCACHED_WITH_SASL_SUPPORT 1)
+        pkgconfig_export(REQUIRES libsasl2)
     endif()
 endif()
 

src/libhashkit/CMakeLists.txt

@@ -46,6 +46,7 @@ if(ENABLE_OPENSSL_CRYPTO)
                 if(OPENSSL_CRYPTO_LIBRARY)
                         target_compile_definitions(libhashkit PRIVATE HAVE_OPENSSL_CRYPTO)
                         target_link_libraries(libhashkit PUBLIC OpenSSL::Crypto)
+                        pkgconfig_export(REQUIRES_PRIVATE libcrypto)
                 else()
                         message(WARNING "Could not find OpenSSL::Crypto")
                 endif()

support/CMakeLists.txt

@@ -10,6 +10,8 @@ install(FILES ${CMAKE_CURRENT_BINARY_DIR}/example.cnf
         DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}
         )
 
+pkgconfig_import(REQUIRES)
+pkgconfig_import(REQUIRES_PRIVATE)
 configure_file(libmemcached.pc.in libmemcached.pc @ONLY)
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libmemcached.pc
         COMPONENT dev

support/libmemcached.pc.in

@@ -9,3 +9,5 @@ Description: libmemcached C/C++ library
 Version: @PROJECT_VERSION@
 Libs: -L@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_LIBDIR@ -lmemcached -lmemcachedutil
 Cflags: -I@CMAKE_INSTALL_PREFIX@/@CMAKE_INSTALL_INCLUDEDIR@
+Requires: @PKGCONFIG_REQUIRES@
+Requires.private: @PKGCONFIG_REQUIRES_PRIVATE@