Intel-specific workaround for LinkFlags tests

The Intel C compiler for Linux does not seem to reject any bad flags or
object files on its link lines.  Work around the problem by using a
preprocessor #error directive to ensure that BADFLAG appears in the
build output.  This does not really achieve the purpose of the tests but
it allows them to pass.

Tests/LinkFlags/CMakeLists.txt

@@ -13,7 +13,7 @@ set_property(TARGET LinkFlags_lib PROPERTY STATIC_LIBRARY_FLAGS ${pre}BADFLAG${o
 add_library(LinkFlags_dll SHARED LinkFlagsLib.c)
 set_property(TARGET LinkFlags_dll PROPERTY LINK_FLAGS ${pre}BADFLAG${obj})
 
-add_executable(LinkFlags_exe LinkFlags.c)
+add_executable(LinkFlags_exe LinkFlagsExe.c)
 set_property(TARGET LinkFlags_exe PROPERTY LINK_FLAGS ${pre}BADFLAG${obj})
 
 add_library(LinkFlags_lib_config STATIC LinkFlagsLib.c)
@@ -22,7 +22,7 @@ set_property(TARGET LinkFlags_lib_config PROPERTY STATIC_LIBRARY_FLAGS_${TEST_CO
 add_library(LinkFlags_dll_config SHARED LinkFlagsLib.c)
 set_property(TARGET LinkFlags_dll_config PROPERTY LINK_FLAGS_${TEST_CONFIG_UPPER} ${pre}BADFLAG_${TEST_CONFIG}${obj})
 
-add_executable(LinkFlags_exe_config LinkFlags.c)
+add_executable(LinkFlags_exe_config LinkFlagsExe.c)
 set_property(TARGET LinkFlags_exe_config PROPERTY LINK_FLAGS_${TEST_CONFIG_UPPER} ${pre}BADFLAG_${TEST_CONFIG}${obj})
 
 add_executable(LinkFlags LinkFlags.c)

Tests/LinkFlags/LinkFlagsExe.c

@@ -0,0 +1,6 @@
+int main(void) { return 0; }
+
+/* Intel compiler does not reject bad flags or objects!  */
+#if defined(__INTEL_COMPILER)
+# error BADFLAG
+#endif

Tests/LinkFlags/LinkFlagsLib.c

@@ -1 +1,6 @@
 int flags_lib(void) { return 0; }
+
+/* Intel compiler does not reject bad flags or objects!  */
+#if defined(__INTEL_COMPILER)
+# error BADFLAG
+#endif