This patch series contains "perf" build fixes specific to 6.1. We have
seen occasional build failures in our CI looking like these:

util/parse-events-bison.c: In function 'yy_symbol_print':
util/parse-events-bison.c:901: error: unterminated #if
  901 | #if YYDEBUG
      |
util/parse-events-bison.c:1020:62: error: '_p' undeclared (first use in this function)
 1020 |   yy_symbol_value_print (yyo, yykind, yyvaluep, yylocationp, _parse_state, scanner);
      |                                                              ^~
util/parse-events-bison.c:1020:62: note: each undeclared identifier is reported only once for each function it appears in
util/parse-events-bison.c:1020:64: error: expected ')' at end of input
 1020 |   yy_symbol_value_print (yyo, yykind, yyvaluep, yylocationp, _parse_state, scanner);
      |                         ~                                      ^
      |                                                                )
 1021 |   YYFPRINTF (yyo, ")");
      |
util/parse-events-bison.c:1020:3: error: too few arguments to function 'yy_symbol_value_print'
 1020 |   yy_symbol_value_print (yyo, yykind, yyvaluep, yylocationp, _parse_state, scanner);
      |   ^~~~~~~~~~~~~~~~~~~~~
util/parse-events-bison.c:991:1: note: declared here
  991 | yy_symbol_value_print (FILE *yyo,
      | ^~~~~~~~~~~~~~~~~~~~~

which are resolved by these patches.

Changes in v2:

- backport change adding version-lt3 macro
- added fix for "perf build: Disable fewer bison warnings" per Sasha's review

Arnaldo Carvalho de Melo (2):
  tools build: Add 3-component logical version comparators
  perf build: Remove -Wno-unused-but-set-variable from the flex flags
    when building with clang < 13.0.0

Ian Rogers (3):
  perf build: Conditionally define NDEBUG
  perf parse-events: Make YYDEBUG dependent on doing a debug build
  perf build: Disable fewer bison warnings

 tools/perf/Makefile.config     |  1 +
 tools/perf/util/Build          | 32 +++++++++++++++++++++++++-------
 tools/perf/util/expr.y         |  4 +++-
 tools/perf/util/parse-events.y |  3 +++
 tools/perf/util/pmu.y          |  3 +++
 tools/scripts/utilities.mak    | 20 ++++++++++++++++++++
 6 files changed, 55 insertions(+), 8 deletions(-)

-- 
2.34.1