incorrect error message ('-Werror=edantic') with -pedantic

[James Hunt]

Specifying '-pedantic' and '-Werror' together with a file that triggers a pedantic warning results in an incorrect message:

$ gcc -Werror foo.c
foo.c: In function ‘main’:
foo.c:21:5: erreur: ‘for’ loop initial declarations are only allowed in C99 mode
foo.c:21:5: note: use option -std=c99 or -std=gnu99 to compile your code
$ gcc -pedantic -Werror foo.c
foo.c:14:6: erreur: ISO C90 doesn’t support unnamed structs/unions [-Werror=edantic]
foo.c: In function ‘main’:
foo.c:21:5: erreur: ‘for’ loop initial declarations are only allowed in C99 mode
foo.c:21:5: note: use option -std=c99 or -std=gnu99 to compile your code
cc1: all warnings being treated as errors
$ gcc -Werror -pedantic foo.c
foo.c:14:6: erreur: ISO C90 doesn’t support unnamed structs/unions [-Werror=edantic]
foo.c: In function ‘main’:
foo.c:21:5: erreur: ‘for’ loop initial declarations are only allowed in C99 mode
foo.c:21:5: note: use option -std=c99 or -std=gnu99 to compile your code
cc1: all warnings being treated as errors

Note that '-Werror=edantic' is truncated. Presumably, it should be showing '-Werror=pedantic'?

Note however that both '-Werror=edantic' and '-Werror=pedantic' are (currently) invalid gcc options.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: gcc 4:4.7.2-1ubuntu8
ProcVersionSignature: Ubuntu 3.8.0-16.26-generic 3.8.5
Uname: Linux 3.8.0-16-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu5
Architecture: i386
Date: Mon Apr 8 10:36:45 2013
InstallationDate: Installed on 2010-10-21 (900 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=C
 SHELL=/bin/bash
SourcePackage: gcc-defaults
UpgradeStatus: Upgraded to raring on 2012-12-20 (108 days ago)

[Matthias Klose (doko)]

From the GCC 4.8 release notes:

The new option -Wpedantic is an alias for -pedantic, which is now deprecated. The forms -Wno-pedantic, -Werror=pedantic, and -Wno-error=pedantic work in the same way as for any other -W option. One caveat is that -Werror=pedantic is not equivalent to -pedantic-errors, since the latter makes into errors some warnings that are not controlled by -Wpedantic, and the former only affects diagnostics that are disabled when using -Wno-pedantic.

Won't fix for 4.7.

[James Hunt (jamesodhunt)]

Hi doko - the main problem here is that gcc is incorrectly showing the name of the -W option: as shown it is incorrect as it is missing the leading 'p' of 'pedantic':

-Werror=edantic
                 ^
                 |
       should be 'pedantic', not 'edantic'

[James Hunt (jamesodhunt)]

/me sighs at lack of verbatim text input in lp :-)

[Matthias Klose (doko)]

still a won't fix for 4.7

[Matthias Klose (doko)]

fixed in 4.8 and later