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* [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly
@ 2012-03-12 16:25 shihjr at gmail dot com
2012-03-12 16:31 ` [Bug preprocessor/52566] " redi at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: shihjr at gmail dot com @ 2012-03-12 16:25 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
Bug #: 52566
Summary: #include in c++ namespace scope doesn't work properly
Classification: Unclassified
Product: gcc
Version: 4.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: shihjr@gmail.com
# gcc --version
gcc (Ubuntu 4.4.3-4ubuntu5) 4.4.3
3 source files: ns1.h ns2.h test.cpp
---------------------------------------------------------
ns1.h:
#pragma once
class A
{
};
---------------------------------------------------------
ns2.h:
#pragma once
class A
{
};
---------------------------------------------------------
test.cpp:
namespace NS1
{
#include "ns1.h"
}
namespace NS2
{
#include "ns2.h"
}
int main()
{
NS2::A a;
return 0;
}
---------------------------------------------------------
# touch * // important step, let ns1.h and ns2.h have same modification time
# gcc test.cpp
test.cpp: In function 'int main()':
test.cpp:11: error: 'A' is not a member of 'NS2'
test.cpp:11: error: expected ';' before 'a'
# gcc -c -E test.cpp
# 1 "test.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "test.cpp"
namespace NS1
{
# 1 "ns1.h" 1
class A
{
};
# 4 "test.cpp" 2
}
namespace NS2
{
}
int main()
{
NS2::A a;
return 0;
}
----------------------------------------------------
The NS2::A declaration isn't included in namespace NS2
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/52566] #include in c++ namespace scope doesn't work properly
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
@ 2012-03-12 16:31 ` redi at gcc dot gnu.org
2012-03-12 17:10 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2012-03-12 16:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-12 16:30:32 UTC ---
this has nothing to do with namespace scope, it's #pragma once confusing two
separate files as one
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/52566] #include in c++ namespace scope doesn't work properly
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
2012-03-12 16:31 ` [Bug preprocessor/52566] " redi at gcc dot gnu.org
@ 2012-03-12 17:10 ` jakub at gcc dot gnu.org
2012-03-14 10:48 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-03-12 17:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-12 17:09:37 UTC ---
You either should have different content of the two headers, or don't use
#pragma once, or you need to have different timestamps. In order to support
symlinks/hardlinks and also lame filesystems that lack them, the preprocessor
only looks at file sizes/timestamps and content if there are multiple #pragma
once (or #import) headers.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/52566] #include in c++ namespace scope doesn't work properly
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
2012-03-12 16:31 ` [Bug preprocessor/52566] " redi at gcc dot gnu.org
2012-03-12 17:10 ` jakub at gcc dot gnu.org
@ 2012-03-14 10:48 ` redi at gcc dot gnu.org
2022-12-14 13:19 ` [Bug preprocessor/52566] #include with #pragma once and files' contents is the same pinskia at gcc dot gnu.org
2022-12-14 13:27 ` terra at gnome dot org
4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2012-03-14 10:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-03-14 10:46:54 UTC ---
If you want to use #pragma once the simplest solution might be to put a unique
comment in each file, with e.g. just the filename, or a description of its
purpose
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/52566] #include with #pragma once and files' contents is the same
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
` (2 preceding siblings ...)
2012-03-14 10:48 ` redi at gcc dot gnu.org
@ 2022-12-14 13:19 ` pinskia at gcc dot gnu.org
2022-12-14 13:27 ` terra at gnome dot org
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-12-14 13:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |terra at gnome dot org
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 108101 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/52566] #include with #pragma once and files' contents is the same
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
` (3 preceding siblings ...)
2022-12-14 13:19 ` [Bug preprocessor/52566] #include with #pragma once and files' contents is the same pinskia at gcc dot gnu.org
@ 2022-12-14 13:27 ` terra at gnome dot org
4 siblings, 0 replies; 6+ messages in thread
From: terra at gnome dot org @ 2022-12-14 13:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52566
--- Comment #5 from M Welinder <terra at gnome dot org> ---
From 108101:
Note also:
# gcc -MM c.c
c.o: c.c a.h
No b.h present!
I.e., Makefiles built with this will not pick up changes to the second file.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-12-14 13:27 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-03-12 16:25 [Bug preprocessor/52566] New: #include in c++ namespace scope doesn't work properly shihjr at gmail dot com
2012-03-12 16:31 ` [Bug preprocessor/52566] " redi at gcc dot gnu.org
2012-03-12 17:10 ` jakub at gcc dot gnu.org
2012-03-14 10:48 ` redi at gcc dot gnu.org
2022-12-14 13:19 ` [Bug preprocessor/52566] #include with #pragma once and files' contents is the same pinskia at gcc dot gnu.org
2022-12-14 13:27 ` terra at gnome dot org
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