Description
The ARM C compiler warns of 'junk at end of #endif line - ignored'

Solution
Some other C compilers may silently ignore characters following arguments to preprocessor directives. The ARM C compiler is much stricter in its interpretation of the C language. The problem is probably caused by code like:

#ifdef SOMETHING
   :
#endif SOMETHING 

The #endif does not expect or require any argument. Enclosing the trailing part of the line in a comment should cure the problem:

#endif /* SOMETHING */ 

Another workaround is to configure the compiler options to disable this type of warning. The compiler option for this is '-Ep'.
For the ARM Project Manager (APM), select Project->Tool Configuration->cc->set, then select the 'Errors' tab and uncheck the 'Junk at end of #endif/#else/#undef' box.