Qing Zhao
2a27ae32fa
'-Wstrict-flex-arrays'
Warn about inproper usages of flexible array members according to
the LEVEL of the 'strict_flex_array (LEVEL)' attribute attached to
the trailing array field of a structure if it's available,
otherwise according to the LEVEL of the option
'-fstrict-flex-arrays=LEVEL'.
This option is effective only when LEVEL is bigger than 0.
Otherwise, it will be ignored with a warning.
when LEVEL=1, warnings will be issued for a trailing array
reference of a structure that have 2 or more elements if the
trailing array is referenced as a flexible array member.
when LEVEL=2, in addition to LEVEL=1, additional warnings will be
issued for a trailing one-element array reference of a structure if
the array is referenced as a flexible array member.
when LEVEL=3, in addition to LEVEL=2, additional warnings will be
issued for a trailing zero-length array reference of a structure if
the array is referenced as a flexible array member.
gcc/ChangeLog:
* doc/invoke.texi: Document -Wstrict-flex-arrays option.
* gimple-array-bounds.cc (check_out_of_bounds_and_warn): Add two more
arguments.
(array_bounds_checker::check_array_ref): Issue warnings for
-Wstrict-flex-arrays.
* opts.cc (finish_options): Issue warning for unsupported combination
of -Wstrict_flex_arrays and -fstrict-flex-array.
* tree-vrp.cc (execute_ranger_vrp): Enable the pass when
warn_strict_flex_array is true.
gcc/c-family/ChangeLog:
* c.opt (Wstrict-flex-arrays): New option.
gcc/testsuite/ChangeLog:
* gcc.dg/Warray-bounds-flex-arrays-1.c: Update testing case with
-Wstrict-flex-arrays.
* gcc.dg/Warray-bounds-flex-arrays-2.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-3.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-4.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-5.c: Likewise.
* gcc.dg/Warray-bounds-flex-arrays-6.c: Likewise.
* c-c++-common/Wstrict-flex-arrays.c: New test.
* gcc.dg/Wstrict-flex-arrays-2.c: New test.
* gcc.dg/Wstrict-flex-arrays-3.c: New test.
* gcc.dg/Wstrict-flex-arrays.c: New test.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.