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Description of problem:

Net-SNMP libraries and headers are invalid due to hyphens.

Version-Release number of selected component (if applicable):

gcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.i686

How reproducible:

1. # vi test.c 

  #ifdef net-snmp-config_multilib_redirection_h
  #endif
  int main()
  {
  	        return 0;
  }


2. # gcc -o test test.c

  test.c:1:11: warning: extra tokens at end of #ifdef directive


Actual results:

The C program compiles but warns of: test.c:1:11: warning: extra tokens at end of #ifdef directive.

Remove the hyphens from the #ifdef and #define directives and the problem is fixed.


Expected results:

Absence of the extra token message.


Additional info:

Non-conformance of standards. C11 and C99 have a section under 6.4.2.1 that describes what is considered valid syntax for an identifier, which includes pre-processor macro identifiers.

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf is the standard document for C99 which provides a reference.

Upon consideration of what is considered a valid identifier per C99, "net-snmp-config_multilib_redirection_h" is not a valid identifier because it contains a hyphen. The hyphen is not in the list of characters that are acceptable in an identifier.

Affects current net-snmp packages in RHEL 6.5:

net-snmp-libs-5.5-44.el6_4.4.x86_64
net-snmp-devel-5.5-44.el6_4.4.x86_64
net-snmp-5.5-44.el6_4.4.x86_64
net-snmp-utils-5.5-44.el6_4.4.x86_64

Sure, hyphen is not valid identifier, the above is handled essentially as
#ifdef net
with extra tokens after it for which it warns.  Various sources contain extra tokens after e.g. #ifdef, or #else, #endif etc.
If you want the compiler to error on this, just use -pedantic-errors, then you'll get a hard error instead of warning.

Well, it can still be fixed on net-snmp side simply by renaming net-snmp-* symbols to net_snmp_*.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-1385.html