[Bug fortran/44054] New: Handle -Werror, -Werror=, -fdiagnostics-show-option

[Bug fortran/44054] New: Handle -Werror, -Werror=, -fdiagnostics-show-option

[burnus at gcc dot gnu dot org]

The middle end now supports besides -Werror also -Werror=list, where
-Werror=<foo> implies -W<foo>. Additionally, the middle end also annotates via
-fdiagnostics-show-option (enabled by default) the messages with the
warning-flag name in parentheses:

-Wuninitialized  (or, e.g.: -Wall)
  foo.c:4:2: warning: 'j' is used uninitialized in this function
[-Wuninitialized]
-Wuninitialized -fno-diagnostics-show-option:
  foo.c:4:2: warning: 'j' is used uninitialized in this function
-Werror=uninitialized (or, e.g.: -Werror -Wall)
  foo.c:4:2: error: 'j' is used uninitialized in this function
[-Werror=uninitialized]


Expected:

a) -Werror  caues gfortran to print "Error" rather than "Warning"; currently it
only changes the exit status code (and the total error count)

b) -f(no-)diagnostics-show-option is supported by printing the flag in
parenthesis after the warning

c) -Werror=<list> is supported.


-- 
           Summary: Handle -Werror, -Werror=, -fdiagnostics-show-option
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: burnus at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44054

[Bug fortran/44054] Handle -Werror, -Werror=, -fdiagnostics-show-option

[burnus at gcc dot gnu dot org]

------- Comment #1 from burnus at gcc dot gnu dot org  2010-05-10 10:30 -------
-Werror= was added 2006 (
http://gcc.gnu.org/viewcvs?view=revision&revision=109907 ) and the
-fdiagnostics-show-option already exists since 2005
(http://gcc.gnu.org/viewcvs?view=revision&revision=99169 ) - though it has only
be enabled very recently, cf.
http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00910.html


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44054

[Bug fortran/44054] Handle -Werror, -Werror=, -fdiagnostics-show-option

[dfranke at gcc dot gnu dot org]

------- Comment #2 from dfranke at gcc dot gnu dot org  2010-05-10 16:58 -------
This probably superseeds (accompanies?) PR31601.


-- 

dfranke at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dfranke at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44054

[Bug fortran/44054] Handle -Werror, -Werror=, -fdiagnostics-show-option

[burnus at gcc dot gnu dot org]

------- Comment #3 from burnus at gcc dot gnu dot org  2010-05-10 17:16 -------
(In reply to comment #2)
> This probably superseeds (accompanies?) PR31601.

Not really. This is about warnings - the other is about errors due to -std=.
For warnings, the purpose is to help fine-tuning the warnings - while for
errors (-std=, -f(no-)range-check) the idea is to point the user to an option,
which allows him/her to still compile the program. 

(Sometimes one is simply not aware that a certain option exists - and
especially non-Fortran programmers tend to compile legacy Fortran programs. But
even I tend to forget about. e.g., -std=legacy or -fdollar-ok.)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44054

[Bug fortran/44054] Handle -Werror, -Werror=, -fdiagnostics-show-option

[manu at gcc dot gnu dot org]

------- Comment #4 from manu at gcc dot gnu dot org  2010-05-15 00:44 -------
It would be so nice if there was a single diagnostics library that all FEs
could use and help to enhance. Something configurable, flexible and powerful
like LLVM's diagnostics library. Then Fortran could configure the library to
get a consistent output. Maybe pooling resources we could get caret
diagnostics, ranges, xml output, color, fix-it hints, spell-checker and a few
other features that LLVM already has.


-- 

manu at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-05-15 00:44:07
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44054