find_library: Generalize helper macro in test case

In Tests/CMakeOnly/find_library/CMakeLists.txt generalize the
test_find_library macro and move the lib64 substitution logic to a new
test_find_library_subst macro.

Tests/CMakeOnly/find_library/CMakeLists.txt

@@ -3,34 +3,34 @@ project(FindLibraryTest NONE)
 
 set(CMAKE_FIND_DEBUG_MODE 1)
 
-macro(test_find_library expected)
-  get_filename_component(dir ${expected} PATH)
-  get_filename_component(name ${expected} NAME)
-  string(REGEX REPLACE "lib/?64" "lib" dir "${dir}")
+macro(test_find_library desc expected)
   unset(LIB CACHE)
-  find_library(LIB
-    NAMES ${name}
-    PATHS ${CMAKE_CURRENT_SOURCE_DIR}/${dir}
-    NO_DEFAULT_PATH
-    )
+  find_library(LIB ${ARGN} NO_DEFAULT_PATH)
   if(LIB)
     # Convert to relative path for comparison to expected location.
     file(RELATIVE_PATH REL_LIB "${CMAKE_CURRENT_SOURCE_DIR}" "${LIB}")
 
-    # Debugging output.
-    if(CMAKE_FIND_DEBUG_MODE)
-      message(STATUS "Library ${expected} searched as ${dir}, found as [${REL_LIB}].")
-    endif()
-
     # Check and report failure.
     if(NOT "${REL_LIB}" STREQUAL "${expected}")
-      message(SEND_ERROR "Library ${l} should have been [${expected}] but was [${REL_LIB}]")
+      message(SEND_ERROR "Library ${expected} found as [${REL_LIB}]${desc}")
+    elseif(CMAKE_FIND_DEBUG_MODE)
+      message(STATUS "Library ${expected} found as [${REL_LIB}]${desc}")
     endif()
   else()
-    message(SEND_ERROR "Library ${expected} searched as ${dir}, NOT FOUND!")
+    message(SEND_ERROR "Library ${expected} NOT FOUND${desc}")
   endif()
 endmacro()
 
+macro(test_find_library_subst expected)
+  get_filename_component(dir ${expected} PATH)
+  get_filename_component(name ${expected} NAME)
+  string(REGEX REPLACE "lib/?64" "lib" dir "${dir}")
+  test_find_library(", searched as ${dir}" "${expected}"
+    NAMES ${name}
+    PATHS ${CMAKE_CURRENT_SOURCE_DIR}/${dir}
+    )
+endmacro()
+
 set(CMAKE_FIND_LIBRARY_PREFIXES "lib")
 set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
 set_property(GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS TRUE)
@@ -44,7 +44,7 @@ foreach(lib
     lib/libtest3.a
     lib/libtest3.a
     )
-  test_find_library(${lib})
+  test_find_library_subst(${lib})
 endforeach()
 
 set(CMAKE_SIZEOF_VOID_P 8)
@@ -57,5 +57,5 @@ foreach(lib64
     lib64/A/libtest1.a
     lib64/libtest1.a
     )
-  test_find_library(${lib64})
+  test_find_library_subst(${lib64})
 endforeach()