http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55252
Bug #: 55252
Summary: Caret diagnostic doesn't show useful location when
macro clashes with name in system header
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
(preprocessed source doesn't show the error due to the system_header pragma)
$ cat test.cc
#define bar 1
#include "header.h"
$ cat header.h
#pragma GCC system_header
int bar = 0;
$ g++ test.cc
test.cc:1:13: error: expected unqualified-id before numeric constant
#define bar 1
^
This is no help because it doesn't point you to the line in header.h that
clashes with 'bar'
Without the system_header pragma you get
test.cc:1:13: error: expected unqualified-id before numeric constant
#define bar 1
^
header.h:2:5: note: in expansion of macro 'bar'
int bar = 0;
^
Which at least shows both locations, although the first diagnostic is still
confusing ... are the two locations backwards? The "expected unqualified-id
before numeric constant" should point to "int bar = 0;"
