Description Olexiy Buyanskyy 2010-07-28 13:49:29 EDT

Reproduce: have any two headers h1.h and h2.h with redefined macros. Compile with xlc.

In h1.h

#define MYMACRO 0

In h2.h

#include <h1.h>
#define MYMACRO 1

During compilation you will see warning in h1.h

h1.h:1: Macro name MYMACRO originally defined in h1.h

That is a little confusing. I propose to change rules in Window/Preferences/C/C++/Build to generate two cross referenced warnings and ignore meanless

Ignore meanless warning first

			<pattern description-expr="" eat-processed-line="true" file-expr="" line-expr="" regex="[&quot;]?(.*?)[&quot;]?, line ([0-9]+)\.[0-9]+:( [0-9]*-[0-9]*)? \(W\)\s*Macro name .* has been redefined\." severity="Ignore"/>

And generate cross referenced warnings

			<pattern description-expr="Macro name $4 has been redefined in file $1:$2" eat-processed-line="false" file-expr="$6" line-expr="$5" regex="[&quot;]?(.*?)[&quot;]?, line ([0-9]+)\.[0-9]+:( [0-9]*-[0-9]*)? \(I\)\s*[&quot;]?(\w*)[&quot;]? is defined on line ([0-9]+) of (.*)\." severity="Warning"/>
			<pattern description-expr="Macro name $4 redefines macro in file $6:$5" eat-processed-line="true" file-expr="$1" line-expr="$2" regex="[&quot;]?(.*?)[&quot;]?, line ([0-9]+)\.[0-9]+:( [0-9]*-[0-9]*)? \(I\)\s*[&quot;]?(\w*)[&quot;]? is defined on line ([0-9]+) of (.*)\." severity="Warning"/>