perf parse-events: Disable a subset of bison warnings

Rather than disable all warnings with -w, disable specific warnings.

Predicate enabling the warnings on a recent version of bison.

Tested with GCC 9.3.0 and clang 9.0.1.

Committer testing:

The full set of compilers, gcc and clang that this will be tested on
will be on the signed tag when this change goes upstream.

Had to add -Wno-switch-enum to build on opensuse tumbleweed:

  /tmp/build/perf/util/parse-events-bison.c: In function 'yydestruct':
  /tmp/build/perf/util/parse-events-bison.c:1200:3: error: enumeration value 'YYSYMBOL_YYEMPTY' not handled in switch [-Werror=switch-enum]
   1200 |   switch (yykind)
        |   ^~~~~~
  /tmp/build/perf/util/parse-events-bison.c:1200:3: error: enumeration value 'YYSYMBOL_YYEOF' not handled in switch [-Werror=switch-enum]

Also replace -Wno-error=implicit-function-declaration with -Wno-implicit-function-declaration.

Also needed to check just the first two levels of the bison version, as
the patch was assuming that all versions were of the form x.y.z, and
there are several cases where it is just x.y, breaking the build.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions