[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[noloader at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272

Jeffrey Walton noloader at gmail dot com changed:

   What|Removed |Added

 CC||noloader at gmail dot com

--- Comment #5 from Jeffrey Walton noloader at gmail dot com 2010-12-05 
14:01:38 UTC ---
Confirmed.

Bad:
CXXFLAGS = -g3 -ggdb -DDEBUG -O0 -Wall -Wextra -Wno-unused-parameter -I.

Good:
CXXFLAGS = -g2 -ggdb -DDEBUG -O0 -Wall -Wextra -Wno-unused-parameter -I.

Other buggy behavior: use a precompiled header. Add empty class files and
include the the precompiled header. GCC crash.

$ cat class-test.h

#include pch.h

$ cat class-test.cpp

$ cat makefile

CXX = g++
CXXFLAGS = -g3 -ggdb -DDEBUG -O0 -Wall -Wextra -Wno-unused-parameter -I.
# CXXFLAGS = -g1 -DNDEBUG -O2 -Wall -Wextra -Wno-unused-parameter -I.

COMMONSRCS = class-test.cpp

EXESRCS = $(COMMONSRCS)
EXEOBJS = $(EXESRCS:.cpp=.o)

LDFLAGS = -lcrypto -lpthread

default: precompile all

all: test.exe

precompile:
$(CXX) $(CXXFLAGS) pch.h -o pch.h.gch

test.exe:
$(CXX) $(CXXFLAGS) $(EXESRCS) -o $@ $(LDFLAGS)

[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[noloader at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272

--- Comment #4 from Jeffrey Walton noloader at gmail dot com 2010-12-05 
14:01:18 UTC ---
Created attachment 22643
  -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=22643
GCC crash on precompiled header, -g3, and empty file

[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272

Richard Guenther rguenth at gcc dot gnu.org changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution||DUPLICATE

--- Comment #6 from Richard Guenther rguenth at gcc dot gnu.org 2010-12-05 
22:20:24 UTC ---
As a matter of fact it doesn't work reliably to include a precompiled header
indirectly.  And since GCC 4.5 that case will be detected and the PCH will
not be used:

2009-09-22  Richard Guenther  rguent...@suse.de

PR pch/38987
* files.c (pch_open_file): Disallow non-toplevel PCH inclusion.

So I can also close it as dup if you like that more ;)  More elaborate
description of the problem in that bug.

*** This bug has been marked as a duplicate of bug 38987 ***

[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[jay dot foad at gmail dot com]

--- Comment #3 from jay dot foad at gmail dot com  2010-06-08 14:24 ---
I've just seen this too:

$ gcc --version
gcc (Ubuntu 4.4.3-4ubuntu5) 4.4.3
[...]
$ cat a.h
void a(void);
$ cat b.h
#include a.h
$ cat b.c
#include b.h
void b(void) {}
$ gcc -c -g3 a.h
$ gcc -c -g3 b.c
/tmp/ccpqcXiZ.s: Assembler messages:
/tmp/ccpqcXiZ.s:429: Error: file number 2 already allocated


-- 

jay dot foad at gmail dot com changed:

   What|Removed |Added

 CC||jay dot foad at gmail dot
   ||com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272

[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[rguenth at gcc dot gnu dot org]

--- Comment #1 from rguenth at gcc dot gnu dot org  2009-05-27 14:10 ---
You have to include a precompiled header from the toplevel source file as the
very first thing or preferably via the -include command-line parameter.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution||INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272

[Bug pch/40272] error using precompiled headers with extra debug info (-g3)

[gafunchal at gmail dot com]

--- Comment #2 from gafunchal at gmail dot com  2009-05-27 14:25 ---
(In reply to comment #1)
 You have to include a precompiled header from the toplevel source file as the
 very first thing or preferably via the -include command-line parameter.
 

I do not agree with that. The documentation section 3.20 says:

   * A precompiled header can't be used once the first C token is seen.
 You can have preprocessor directives before a precompiled header;
 you can even include a precompiled header from inside another
 header, so long as there are no C tokens before the `#include'.

Please at least read what I'm saying before closing the bug as invalid, the
error shows only when using -g3 so it's clearly NOT a matter of
order-of-things.


-- 

gafunchal at gmail dot com changed:

   What|Removed |Added

 Status|RESOLVED|UNCONFIRMED
 Resolution|INVALID |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40272