https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94428
Bug ID: 94428
Summary: Reintroduce -Wzero-length-array
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: kees at outflux dot net
Target Milestone: ---
It would be nice to gain "-Wzero-length-array" so we can enforce this standard
in the Linux kernel once all conversions have moved struct to flexible array
members. Clang supports this as a distinct warning, but gcc currently only
warns about this under "-pedantic -std=c99", which is not a workable
combination for Linux. ;)
$ clang -Wzero-length-array -o bounds-clang bounds.c
bounds.c:20:15: warning: zero size arrays are an extension
[-Wzero-length-array]
char data[0];
^
$ gcc -Wzero-length-array -o bounds-gcc bounds.c
gcc: error: unrecognized command line option ‘-Wzero-length-array’
$ gcc -pedantic -std=c99 -o bounds-gcc bounds.c
bounds.c:20:10: warning: ISO C forbids zero-size array ‘data’ [-Wpedantic]
20 | char data[0];
| ^~~~
