https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96284
Bug ID: 96284
Summary: Outdated C features should be made errors with newer
standards
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: david at westcontrol dot com
Target Milestone: ---
While C has tried to remain backwards compatible with each new standards
revision, some changes have been made so that particularly unsafe features from
old code are no longer supported. gcc has (reasonably enough) tried to keep
support for old features, but when something has been deprecated for decades,
perhaps it is time for it to be treated as an error by default and require an
explicit flag. (This is in the same style as bug 85678 making "-fno-common"
the default.)
For example, implicit function declarations from K&R C were made obsolescent in
C90, and removed from the language in C99. But by default, they still only
cause a warning (-Wimplicit-function-declaration) in gcc, no matter what
standard is picked.
Could this be made an error by default (-Werror=implicit-function-declarations)
? Let those who want to compile old code with implicit function declarations,
do so with an explicit flag.
