[Bug c/107448] New: GCC no longer diagnoses missing input file with -MG

[Bug c/107448] New: GCC no longer diagnoses missing input file with -MG

[boris at kolpackov dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107448

            Bug ID: 107448
           Summary: GCC no longer diagnoses missing input file with -MG
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: boris at kolpackov dot net
  Target Milestone: ---

With GCC 10 when trying to extract dependency information with -MG we get
diagnostics if the input file does not exist:

$ g++-10 -M -MG /tmp/no-such-file.cxx
g++-10: error: /tmp/no-such-file.cxx: No such file or directory
g++-10: fatal error: no input files
compilation terminated.

$ echo $?
1

In GCC 11 and 12 this diagnostics is gone:

$ g++-11 -M -MG /tmp/no-such-file.cxx
$ echo $?
1

$ g++-12 -M -MG /tmp/no-such-file.cxx
$ echo $?
1

[Bug driver/107448] GCC no longer diagnoses missing input file with -MG since r11-6855-g4804de453e7f5f90

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107448

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-11-10
                 CC|                            |marxin at gcc dot gnu.org,
                   |                            |nathan at gcc dot gnu.org
     Ever confirmed|0                           |1
            Summary|GCC no longer diagnoses     |GCC no longer diagnoses
                   |missing input file with -MG |missing input file with -MG
                   |                            |since
                   |                            |r11-6855-g4804de453e7f5f90
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Likely started with r11-6855-g4804de453e7f5f90.

[Bug driver/107448] [11/12/13 Regression] GCC no longer diagnoses missing input file with -MG since r11-6855-g4804de453e7f5f90

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107448

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid
            Summary|GCC no longer diagnoses     |[11/12/13 Regression] GCC
                   |missing input file with -MG |no longer diagnoses missing
                   |since                       |input file with -MG since
                   |r11-6855-g4804de453e7f5f90  |r11-6855-g4804de453e7f5f90
   Target Milestone|---                         |11.4

[Bug driver/107448] [11/12/13 Regression] GCC no longer diagnoses missing input file with -MG since r11-6855-g4804de453e7f5f90

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107448

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|accepts-invalid             |diagnostic
           Priority|P3                          |P2

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's a diagnostic issue, the driver still exits with an error.  Supposedly cc1
(as preprocessor) is supposed to diagnose the missing file now.

[Bug preprocessor/107448] [11/12/13/14 Regression] GCC no longer diagnoses missing input file with -MG since r11-6855-g4804de453e7f5f90

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107448

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|11.4                        |11.5

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC 11.4 is being released, retargeting bugs to GCC 11.5.