Map multiple /FI flags for VS < 10 (#11649)

The /FI flag may be repeated so the flag table entry needs to be marked
with SemicolonAppendable.  This was already the case for VS 10.

Source/cmLocalVisualStudio7Generator.cxx

@@ -427,7 +427,7 @@ cmVS7FlagTable cmLocalVisualStudio7GeneratorFlagTable[] =
   // The YX and Yu options are in a per-global-generator table because
   // their values differ based on the VS IDE version.
   {"ForcedIncludeFiles", "FI", "Forced include files", "",
-   cmVS7FlagTable::UserValueRequired},
+   cmVS7FlagTable::UserValueRequired | cmVS7FlagTable::SemicolonAppendable},
 
   // boolean flags
   {"BufferSecurityCheck", "GS", "Buffer security check", "TRUE", 0},

Tests/CMakeLists.txt

@@ -1044,6 +1044,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DVERSION=master -P ${CMake_SOURCE_DIR}/Utilities/
   LIST(APPEND TEST_BUILD_DIRS "${CMake_BINARY_DIR}/Tests/SubDir")
 
   IF(CMAKE_TEST_MSVC)
+    ADD_TEST_MACRO(ForceInclude foo)
     ADD_TEST_MACRO(PrecompiledHeader foo)
     ADD_TEST_MACRO(ModuleDefinition example_exe)
   ENDIF(CMAKE_TEST_MSVC)

Tests/ForceInclude/CMakeLists.txt

@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 2.8.3.20110103)
+project(ForceInclude C)
+
+# Make sure the proper compiler is in use.
+if(NOT MSVC AND NOT "${CMAKE_C_COMPILER_ID}" MATCHES "^(Intel)$")
+  message(FATAL_ERROR "The ForceInclude test works only with MSVC or Intel")
+endif()
+
+add_executable(foo foo.c)
+set_property(SOURCE foo.c PROPERTY COMPILE_FLAGS "/FIfoo1.h /FIfoo2.h")

Tests/ForceInclude/foo.c

@@ -0,0 +1,7 @@
+#ifndef FOO_1
+# error "foo1.h not included by /FI"
+#endif
+#ifndef FOO_2
+# error "foo2.h not included by /FI"
+#endif
+int main(void) { return 0; }

Tests/ForceInclude/foo1.h

@@ -0,0 +1 @@
+#define FOO_1

Tests/ForceInclude/foo2.h

@@ -0,0 +1 @@
+#define FOO_2