cmake: fix check detection

Building on Ubuntu 18.04 fails with missing symbols message
due to lack of proper libraries being automatically linked
against tests.

This patch uses pkgconfig to automatically detect system-installed
libcheck, and also gets rid of the unnecessery symbol requirement in
favor of a simple version check.

CMakeLists.txt

@@ -126,16 +126,13 @@ add_subdirectory(${CCOMMON_SOURCE_DIR} ${PROJECT_BINARY_DIR}/ccommon)
 include(FindPackageHandleStandardArgs)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
 
-find_package(Check)
-if(NOT CHECK_FOUND)
-    message(WARNING "Check is required to build and run tests")
-endif(NOT CHECK_FOUND)
-if(CHECK_FOUND)
-    check_symbol_exists(ck_assert_int_eq check.h CHECK_WORKING)
-    if(NOT CHECK_WORKING)
-        message(WARNING "Check version too old to build tests")
-    endif(NOT CHECK_WORKING)
-endif(CHECK_FOUND)
+find_package(PkgConfig QUIET)
+
+if(PKG_CONFIG_FOUND)
+    pkg_check_modules(Check REQUIRED check>=0.10)
+else()
+    find_package(Check REQUIRED 0.10)
+endif()
 
 find_package(Threads)
 

deps/ccommon/CMakeLists.txt

@@ -140,17 +140,6 @@ endif(COVERAGE)
 include(FindPackageHandleStandardArgs)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake")
 
-find_package(Check)
-if(NOT CHECK_FOUND)
-    message(WARNING "Check is required to build and run tests")
-endif(NOT CHECK_FOUND)
-if(CHECK_FOUND)
-    check_symbol_exists(ck_assert_int_eq check.h CHECK_WORKING)
-    if(NOT CHECK_WORKING)
-        message(WARNING "Check version too old to build tests")
-    endif(NOT CHECK_WORKING)
-endif(CHECK_FOUND)
-
 find_package(Threads)