public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
@ 2011-11-28 22:57 dx_zhou at hotmail dot com
2011-11-28 23:20 ` [Bug preprocessor/51341] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: dx_zhou at hotmail dot com @ 2011-11-28 22:57 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
Bug #: 51341
Summary: make cannot detect head file change by dependency file
with gcc 4.6.1 on ubuntu 11.10
Classification: Unclassified
Product: gcc
Version: 4.6.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: dx_zhou@hotmail.com
The issue is that make command cannot detect changes in head file. i.e, if I
touch "test.h", make command will not recompile.
This works with gcc 4.5.4 on the same OS.
--test.h--
#include <iostream>
void hello()
{
std::cout << "Hello\n";
}
--test.cc--
#include "test.h"
int main()
{
hello();
}
--Makefile--
sources := test.cc
objects := test.o
depends := test.d
main := test
$(main) : % : %.o
g++ $< -o $@
%.o : %.cc
g++ -c -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" $< -o $@
clean :
-rm -rf $(objects) $(depends) $(main)
ifneq ($(MAKECMDGOALS),clean)
-include $(depends)
endif
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
@ 2011-11-28 23:20 ` pinskia at gcc dot gnu.org
2011-11-28 23:27 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-11-28 23:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |preprocessor
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-11-28 22:54:33 UTC ---
-MT changes the target to the .d rather than adding it to the .o one.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
2011-11-28 23:20 ` [Bug preprocessor/51341] " pinskia at gcc dot gnu.org
@ 2011-11-28 23:27 ` pinskia at gcc dot gnu.org
2011-11-29 15:39 ` dx_zhou at hotmail dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-11-28 23:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-11-28 22:57:30 UTC ---
This was an expected change, see
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12448 . Which says you need
another -MT option to include the .o target.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
2011-11-28 23:20 ` [Bug preprocessor/51341] " pinskia at gcc dot gnu.org
2011-11-28 23:27 ` pinskia at gcc dot gnu.org
@ 2011-11-29 15:39 ` dx_zhou at hotmail dot com
2011-11-29 16:17 ` redi at gcc dot gnu.org
2011-12-09 14:31 ` dx_zhou at hotmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: dx_zhou at hotmail dot com @ 2011-11-29 15:39 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
--- Comment #3 from davidz <dx_zhou at hotmail dot com> 2011-11-29 14:56:41 UTC ---
I am a little confused. -MT will create .d file. Then make command will include
.d and re-compile if dependency file changes. The issue is that g++ 4.6.1
doesn't re-compile if I touch .h. Does this mean my test.d format is wrong? If
I need another -MT, what syntax it should be? Thanks a lot!
(In reply to comment #2)
> This was an expected change, see
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12448 . Which says you need
> another -MT option to include the .o target.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
` (2 preceding siblings ...)
2011-11-29 15:39 ` dx_zhou at hotmail dot com
@ 2011-11-29 16:17 ` redi at gcc dot gnu.org
2011-12-09 14:31 ` dx_zhou at hotmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2011-11-29 16:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-29 15:26:29 UTC ---
(In reply to comment #3)
> I am a little confused. -MT will create .d file. Then make command will include
> .d and re-compile if dependency file changes. The issue is that g++ 4.6.1
> doesn't re-compile if I touch .h. Does this mean my test.d format is wrong? If
Did you read the linked bug report? Did you look at the content of test.d?
> I need another -MT, what syntax it should be? Thanks a lot!
g++ -c -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" "-MT$@" $< -o $@
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug preprocessor/51341] make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
` (3 preceding siblings ...)
2011-11-29 16:17 ` redi at gcc dot gnu.org
@ 2011-12-09 14:31 ` dx_zhou at hotmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: dx_zhou at hotmail dot com @ 2011-12-09 14:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51341
--- Comment #5 from davidz <dx_zhou at hotmail dot com> 2011-12-09 14:06:22 UTC ---
This did solve the issue. Thanks a lot for the explain and syntax!
(In reply to comment #4)
> (In reply to comment #3)
> > I am a little confused. -MT will create .d file. Then make command will include
> > .d and re-compile if dependency file changes. The issue is that g++ 4.6.1
> > doesn't re-compile if I touch .h. Does this mean my test.d format is wrong? If
>
> Did you read the linked bug report? Did you look at the content of test.d?
>
> > I need another -MT, what syntax it should be? Thanks a lot!
>
> g++ -c -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" "-MT$@" $< -o $@
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-12-09 14:06 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-11-28 22:57 [Bug c++/51341] New: make cannot detect head file change by dependency file with gcc 4.6.1 on ubuntu 11.10 dx_zhou at hotmail dot com
2011-11-28 23:20 ` [Bug preprocessor/51341] " pinskia at gcc dot gnu.org
2011-11-28 23:27 ` pinskia at gcc dot gnu.org
2011-11-29 15:39 ` dx_zhou at hotmail dot com
2011-11-29 16:17 ` redi at gcc dot gnu.org
2011-12-09 14:31 ` dx_zhou at hotmail dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).