options: Add EnumBitSet property support [PR104158]

On Sat, Jan 22, 2022 at 01:47:08AM +0100, Jakub Jelinek via Gcc-patches wrote:
> I think with the 2) patch I achieve what we want for Fortran, for 1)
> the only behavior from gcc 11 is that
> -fsanitize-coverage=trace-cmp,trace-cmp is now rejected.
> This is mainly from the desire to disallow
> -fconvert=big-endian,little-endian or -Wbidi-chars=bidirectional,any
> etc. where it would be confusing to users what exactly it means.
> But it is the only from these options that actually acts as an Enum
> bit set, each enumerator can be specified with all the others.
> So one option would be stop requiring the EnumSet implies Set properties
> must be specified and just require that either they are specified on all
> EnumValues, or on none of them; the latter case would be for
> -fsanitize-coverage= and the non-Set case would mean that all the
> EnumValues need to have disjoint Value bitmasks and that they can
> be all specified and unlike the Set case also repeated.
> Thoughts on this?

Here is an incremental patch to the first two patches of the series
that implements EnumBitSet that fully restores the -fsanitize-coverage
GCC 11 behavior.

2022-01-24  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/104158
	* opt-functions.awk (var_set): Handle EnumBitSet property.
	* optc-gen.awk: Don't disallow RejectNegative if EnumBitSet is
	specified.
	* opts.h (enum cl_enum_var_value): New type.
	* opts-common.cc (decode_cmdline_option): Use CLEV_* values.
	Handle CLEV_BITSET.
	(cmdline_handle_error): Handle CLEV_BITSET.
	* opts.cc (test_enum_sets): Also test EnumBitSet requirements.
	* doc/options.texi (EnumBitSet): Document.
	* common.opt (fsanitize-coverage=): Use EnumBitSet instead of
	EnumSet.
	(trace-pc, trace-cmp): Drop Set properties.

	* gcc.dg/sancov/pr104158-7.c: Adjust for repeating of arguments
	being allowed.

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/opts.h b/gcc/opts.h
index 88fabf9..a43ce66 100644
--- a/gcc/opts.h
+++ b/gcc/opts.h
@@ -52,6 +52,18 @@ enum cl_var_type {
   CLVC_DEFER
 };
 
+/* Values for var_value member of CLVC_ENUM.  */
+enum cl_enum_var_value {
+  /* Enum without EnumSet or EnumBitSet.  */
+  CLEV_NORMAL,
+
+  /* EnumSet.  */
+  CLEV_SET,
+
+  /* EnumBitSet.  */
+  CLEV_BITSET
+};
+
 struct cl_option
 {
   /* Text of the option, including initial '-'.  */