[Bug preprocessor/17110] New: #include_next fails following #include that specifies an absolute path

[Bug preprocessor/17110] New: #include_next fails following #include that specifies an absolute path

[wb at fnal dot gov]

This bug first manifested for us using gcc 3.4.1 on each of multiple platforms;
it appears to be a regression from each previous gcc 3.x we have tried.

Specifically: an incorrect diagnostic ("no include path in which to search for
...") is produced under the following circumstances:

  File_A contains #include "/absolute/path/to/File_B"
and
  File_B contains #include_next "File_C"

Note that this failure only arises when an absolute path is specified in
Fila_A's #include.

The failure manifests when compiling via gcc as well as via g++.

The failure seems not to depend on the form of the command line -I; it does not
matter whether the directory there specified is part of a relative path or is
part of an absolute path.

A test case follows; there are 5 tiny files to be spread across 3 directories. 
Because there is an absolute path involved, you will need to edit one line (in
test/test.cc) to reflect your local directory tree.

Thanks for looking into this; it's a real show-stopper for us in moving to gcc
3.4.1.  Best,

-- WEB


==========  test/compile  ==========
#!/bin/sh

go()  {
  rm -f a.out

  ( gcc test.cc -o a.out -Inext -D$1\
    && ./a.out\
    && echo Success\
  )\
    || echo Failure!;
}

echo "V1: #include \"inc/next.cc\""
go V1

echo "V2: #include \"./inc/next.cc\""
go V2

echo "V3: #include \"/complete/path/to/inc/next.cc\""
go V3


==========  test/test.cc  ==========
#if defined V1 // works
#include "inc/next.cc"

#elif defined V2 // works
#include "./inc/next.cc"

#else  // EDIT THE NEXT LINE PER YOUR SETUP; FAILS!
#include "/complete/path/to/test/inc/next.cc"

#endif


==========  test/inc/next.h  ==========
//   Note: this header ought be located in the same directory as the
//   next.cc test program; if the directive functions properly, this
//   header will not be #include'd

#error "got wrong <incnext.hh>"


==========  test/inc/next.cc  ==========\
#define RESULT  1

#include_next "next.h"

int  main()
{
  return  RESULT;
}


==========  test/next/next.h  ==========
//   If the directive functions properly, this header
//   will be located instead of the one (by the same name) in the same
//   directory as the next.cc test program

#ifdef RESULT
  #undef RESULT
#endif

#define RESULT 0

-- 
           Summary: #include_next fails following #include that specifies an
                    absolute path
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P1
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: wb at fnal dot gov
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110

[Bug preprocessor/17110] #include_next fails following #include that specifies an absolute path

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-19 20:04 -------
http://gcc.gnu.org/ml/gcc/2003-03/msg00120.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110

[Bug preprocessor/17110] [3.4/3.5 Regression] #include_next fails following #include that specifies an absolute path

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-20 15:40 -------
Confirmed but I could not tell from the link I gave in the previous comment if this was expected or not.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-08-20 15:40:08
               date|                            |
            Summary|#include_next fails         |[3.4/3.5 Regression]
                   |following #include that     |#include_next fails
                   |specifies an absolute path  |following #include that
                   |                            |specifies an absolute path
   Target Milestone|---                         |3.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110

[Bug preprocessor/17110] [3.4/3.5 Regression] #include_next fails following #include that specifies an absolute path

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-08-29 18:50 -------
Postponed until GCC 3.4.3.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.2                       |3.4.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110

[Bug preprocessor/17110] [3.4/4.0 Regression] #include_next fails following #include that specifies an absolute path

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-11-01 00:46 -------
Postponed until GCC 3.4.4.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.3                       |3.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110

[Bug preprocessor/17110] #include_next fails following #include that specifies an absolute path

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2005-01-12 17:58 -------
AFAICS this has never worked as you intended: GCC 2.95.3, 2.96, 3.0.4, 3.1.1,
3.2.3 and 3.3.5 issue

#error "got wrong <inc/next.h>"

which means that #include_next was behaving like #include in that case.  So the
error is a progress, as Geoff and Neil said in the thread linked to above.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu dot
                   |                            |org
             Status|NEW                         |RESOLVED
           Priority|P1                          |P2
         Resolution|                            |INVALID
            Summary|[3.4/4.0 Regression]        |#include_next fails
                   |#include_next fails         |following #include that
                   |following #include that     |specifies an absolute path
                   |specifies an absolute path  |
   Target Milestone|3.4.4                       |---


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17110