Much improved test, should now be executed on all UNIXes

Instead of relying on that some development package is installed on the
system, now a tiny library is built, which is the searched and used
during the test.

Alex

Tests/FindPackageModeMakefileTest/CMakeLists.txt

@@ -1,15 +1,15 @@
 
-if("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU
-  OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Intel
-  OR "${CMAKE_CXX_COMPILER_ID}" MATCHES Clang
-  OR "${CMAKE_CXX_COMPILER_ID}" MATCHES XL
-  OR "${CMAKE_CXX_COMPILER_ID}" MATCHES SunPro)
-
-  find_package(PNG)
 
 # the test program links against the png lib, so test first whether it exists
-  if(PNG_FOUND  AND  UNIX  AND  "${CMAKE_GENERATOR}" MATCHES "Makefile")
+if(UNIX  AND  "${CMAKE_GENERATOR}" MATCHES "Makefile")
 
+  # build a library which we can search during the test
+  add_library(foo STATIC foo.cpp)
+
+  # configure a FindFoo.cmake so it knows where the library can be found
+  configure_file(FindFoo.cmake.in ${CMAKE_CURRENT_BINARY_DIR}/FindFoo.cmake @ONLY)
+
+  # now set up the test:
   get_target_property(cmakeExecutable cmake LOCATION)
 
   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Makefile.in ${CMAKE_CURRENT_BINARY_DIR}/ConfMakefile @ONLY)
@@ -18,5 +18,3 @@ if("${CMAKE_CXX_COMPILER_ID}" MATCHES GNU
   add_test(FindPackageModeMakefileTest ${CMAKE_MAKE_PROGRAM} -f ${CMAKE_CURRENT_BINARY_DIR}/ConfMakefile )
 
 endif()
-
-endif()

Tests/FindPackageModeMakefileTest/FindFoo.cmake.in

@@ -0,0 +1,8 @@
+
+find_library(FOO_LIBRARY NAMES foo HINTS "@CMAKE_CURRENT_BINARY_DIR@" )
+find_path(FOO_INCLUDE_DIR NAMES foo.h HINTS "@CMAKE_CURRENT_SOURCE_DIR@" )
+
+set(FOO_LIBRARIES ${FOO_LIBRARY})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Foo  DEFAULT_MSG  FOO_LIBRARY FOO_INCLUDE_DIR )

Tests/FindPackageModeMakefileTest/Makefile.in

@@ -1,10 +1,10 @@
 all: clean pngtest
 
 main.o: main.cpp
-	"@CMAKE_CXX_COMPILER@" -c `"@cmakeExecutable@" --find-package -DNAME=PNG -DLANGUAGE=CXX -DCOMPILER_ID=@CMAKE_CXX_COMPILER_ID@ -DMODE=COMPILE` main.cpp
+	"@CMAKE_CXX_COMPILER@" -c `"@cmakeExecutable@" --find-package -DCMAKE_MODULE_PATH="@CMAKE_CURRENT_BINARY_DIR@" -DNAME=Foo -DLANGUAGE=CXX -DCOMPILER_ID=@CMAKE_CXX_COMPILER_ID@ -DMODE=COMPILE` main.cpp
 
 pngtest: main.o
-	"@CMAKE_CXX_COMPILER@" -o pngtest main.o `"@cmakeExecutable@" --find-package -DNAME=PNG -DLANGUAGE=CXX -DCOMPILER_ID=@CMAKE_CXX_COMPILER_ID@ -DMODE=LINK`
+	"@CMAKE_CXX_COMPILER@" -o pngtest main.o `"@cmakeExecutable@" --find-package -DCMAKE_MODULE_PATH="@CMAKE_CURRENT_BINARY_DIR@" -DNAME=Foo -DLANGUAGE=CXX -DCOMPILER_ID=@CMAKE_CXX_COMPILER_ID@ -DMODE=LINK`
 
 clean:
 	rm -f *.o pngtest

Tests/FindPackageModeMakefileTest/foo.cpp

@@ -0,0 +1,4 @@
+int foo()
+{
+  return 1477;
+}

Tests/FindPackageModeMakefileTest/foo.h

@@ -0,0 +1,6 @@
+#ifndef FOO_H
+#define FOO_H
+
+int foo();
+
+#endif

Tests/FindPackageModeMakefileTest/main.cpp

@@ -1,8 +1,8 @@
 #include <stdio.h>
-#include <png.h>
+#include <foo.h>
 
 int main()
 {
- printf("PNG copyright: %s\n", png_get_copyright(NULL));
+ printf("foo is: %d\n", foo());
  return 0;
 }