[Bug driver/48306] New: presence of gcc subdir with . in PATH causes breakdown

[Bug driver/48306] New: presence of gcc subdir with . in PATH causes breakdown

[karl at freefriends dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

           Summary: presence of gcc subdir with . in PATH causes breakdown
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: karl@freefriends.org


If a directory in PATH contains a subdirectory gcc/ (with executable access),
gcc fails to find its subprograms:

$ PATH=/tmp:$PATH
$ mkdir /tmp/gcc
$ gcc hello.c
gcc: error trying to exec 'cc1': execvp: No such file or directory
$ rmdir /tmp/gcc
$ gcc hello.c
$

If this behavior is explained or implicit in the documentation, sorry; I
couldn't find it.  It happens in at least gcc 4.5.x and 4.6.0.  I'm sure it
wasn't always this way.

[Bug driver/48306] presence of gcc subdir with . in PATH causes breakdown

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011.03.28 09:40:43
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-28 09:40:43 UTC ---
Works for me.  How did you configure/install GCC?  What does -v output say
for the compile command?

[Bug driver/48306] presence of gcc subdir with . in PATH causes breakdown

[karl at freefriends dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #2 from karl at freefriends dot org 2011-03-28 21:51:03 UTC ---
For both gcc 4.5.2 and 4.6.0, I configured it from the original source on
ftp.gnu.org, using --prefix=/usr/local/gnu --enable-languages=c,c++, no other
arguments.  "make install" to install.

Here is the gcc -v output.  I note that cpp is not even being executed.

$ gcc -v hello.c                                                            
Using built-in specs.                                                           
COLLECT_GCC=gcc                                                                 
Target: i686-pc-linux-gnu                                                       
Configured with: ../gcc-4.6.0/configure --prefix=/usr/local/gnu
--enable-langua\
ges=c,c++                                                                       
Thread model: posix                                                             
gcc version 4.6.0 (GCC)                                                         
COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=pentiumpro'                   
 cc1 -quiet -v -iprefix /tmp/../lib/gcc/i686-pc-linux-gnu/4.6.0/ hello.c
-quiet\
 -dumpbase hello.c -mtune=generic -march=pentiumpro -auxbase hello -version -o
\
/dev/shm/cc34H39x.s                                                             
gcc: error trying to exec 'cc1': execvp: No such file or directory

The /tmp/../lib seems like a clear indication it is finding the empty /tmp/gcc
directory.

I thought it might be something in my environment causing the failure, but even
running with env -i, I get the same error.  It is puzzling that you do not see
it.  I can't think of what else would be specific to my installation.

$ mkdir /tmp/gcc
$ env -i PATH=/tmp:/usr/local/gnu/bin gcc hello.c
gcc: error trying to exec 'cc1': execvp: No such file or directory

(the gcc -v output from this env -i run is the same as above.)

Thanks,
karl

[Bug driver/48306] presence of gcc subdir with . in PATH causes breakdown

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-29 10:15:45 UTC ---
Ok, I can reproduce it with

~> env -i PATH=/tmp:/space/rguenther/install/gcc-4.6.0/bin gcc t.c
gcc: error trying to exec 'cc1': execvp: No such file or directory

but not with

~> env -i PATH=/tmp:$PATH gcc-4.6 t.c
t.c: In function 'main':
t.c:10:3: warning: 'used' attribute ignored [-Wattributes]

weird ;)

Note that we try to search for the GCC install dir, it is not statically
compiled in (so that install with DESTDIR works).

[Bug driver/48306] [4.3/4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.2.4
   Target Milestone|---                         |4.3.6
            Summary|presence of gcc subdir with |[4.3/4.4/4.5/4.6/4.7
                   |. in PATH causes breakdown  |Regression] presence of gcc
                   |                            |subdir with . in PATH
                   |                            |causes breakdown
      Known to fail|                            |4.3.0

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-29 10:17:46 UTC ---
Fails since 4.3.0, works with 4.2.4.

[Bug driver/48306] [4.3/4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug driver/48306] [4.3/4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.6                       |4.4.7

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-27 12:14:40 UTC ---
4.3 branch is being closed, moving to 4.4.7 target.

[Bug driver/48306] [4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-12-19 19:53:43 UTC ---
Created attachment 26146
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26146
gcc47-pr48306.patch

Not sure if this case is something we need to slow the driver down for, but if
yes, this completely untested patch should do that.  I've also fixed a problem
where we IMHO can overflow the alloca returned buffer on cygwin or wherever
HOST_EXECUTABLE_SUFFIX is used, though have no access to such a system to test
that.

[Bug driver/48306] [4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[karl at freefriends dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #7 from karl at freefriends dot org 2011-12-19 22:59:37 UTC ---
I hope you will decide that robustness against the execution environment is
more important than a few milliseconds of runtime.  I wouldn't have reported it
if I hadn't actually run into it in the course of working with the new gcc and
been surprised.  It's not like I read the code and observed a theoretical bug
:).

[Bug driver/48306] [4.4/4.5/4.6/4.7 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-02 22:18:25 UTC ---
Author: jakub
Date: Mon Jan  2 22:18:21 2012
New Revision: 182820

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182820
Log:
    * make-relative-prefix.c (make_relative_prefix_1): Avoid
    stack overflow if PATH contains just a single entry and
    HOST_EXECUTABLE_SUFFIX needs to be used.

    PR driver/48306
    * make-relative-prefix.c: Include sys/stat.h.
    (make_relative_prefix_1): If access succeeds, check also stat
    if nstore is a regular file.

Modified:
    trunk/libiberty/ChangeLog
    trunk/libiberty/make-relative-prefix.c

[Bug driver/48306] [4.4/4.5/4.6 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
            Summary|[4.4/4.5/4.6/4.7            |[4.4/4.5/4.6 Regression]
                   |Regression] presence of gcc |presence of gcc subdir with
                   |subdir with . in PATH       |. in PATH causes breakdown
                   |causes breakdown            |

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-02 22:20:00 UTC ---
Fixed on the trunk so far.

[Bug driver/48306] [4.4/4.5/4.6 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-09 17:16:27 UTC ---
Author: jakub
Date: Thu Feb  9 17:16:19 2012
New Revision: 184050

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184050
Log:
    Backported from mainline
    2012-01-26  Jakub Jelinek  <jakub@redhat.com>

    * make-relative-prefix.c (make_relative_prefix_1): Avoid warning
    about using preprocessor directives inside of macro arguments.

    2012-01-02  Jakub Jelinek  <jakub@redhat.com>

    * make-relative-prefix.c (make_relative_prefix_1): Avoid
    stack overflow if PATH contains just a single entry and
    HOST_EXECUTABLE_SUFFIX needs to be used.

    PR driver/48306
    * make-relative-prefix.c: Include sys/stat.h.
    (make_relative_prefix_1): If access succeeds, check also stat
    if nstore is a regular file.

Modified:
    branches/gcc-4_6-branch/libiberty/ChangeLog
    branches/gcc-4_6-branch/libiberty/make-relative-prefix.c

[Bug driver/48306] [4.4/4.5 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-02-09 21:33:15 UTC ---
Author: jakub
Date: Thu Feb  9 21:33:11 2012
New Revision: 184069

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184069
Log:
    Backported from mainline
    2012-01-26  Jakub Jelinek  <jakub@redhat.com>

    * make-relative-prefix.c (make_relative_prefix_1): Avoid warning
    about using preprocessor directives inside of macro arguments.

    2012-01-02  Jakub Jelinek  <jakub@redhat.com>

    * make-relative-prefix.c (make_relative_prefix_1): Avoid
    stack overflow if PATH contains just a single entry and
    HOST_EXECUTABLE_SUFFIX needs to be used.

    PR driver/48306
    * make-relative-prefix.c: Include sys/stat.h.
    (make_relative_prefix_1): If access succeeds, check also stat
    if nstore is a regular file.

Modified:
    branches/gcc-4_5-branch/libiberty/ChangeLog
    branches/gcc-4_5-branch/libiberty/make-relative-prefix.c

[Bug driver/48306] [4.4 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|4.4.7                       |4.5.4

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-13 13:28:40 UTC ---
Fixed in 4.5+, 4.4 is no longer supported.

[Bug driver/48306] [4.4 Regression] presence of gcc subdir with . in PATH causes breakdown

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mmlr at mlotz dot ch

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-08-16 06:58:19 UTC ---
*** Bug 38966 has been marked as a duplicate of this bug. ***