perf build: Disable thread safety analysis for perl header

When build with perl5, it reports error:

    In file included from /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:7933:
    /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/inline.h:298:5: error:
          mutex 'PL_env_mutex.lock' is not held on every path through
          here [-Werror,-Wthread-safety-analysis]
      298 |     ENV_UNLOCK;
          |     ^
    /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:7091:31: note:
          expanded from macro 'ENV_UNLOCK'
     7091 | #  define ENV_UNLOCK          PERL_REENTRANT_UNLOCK("env"...
          |                               ^
    /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:6465:7: note:
          expanded from macro 'PERL_REENTRANT_UNLOCK'
     6465 |     } STMT_END
          |       ^
    /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:865:28: note:
          expanded from macro 'STMT_END'
      865 | #   define STMT_END     while (0)
          |                                ^

The error is caused by perl header but not perf code, disable thread
safety analysis if including the header.

Though GCC does not support the thread safety analysis option, this
negative warning flag is silently ignored by it.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20251006-perf_build_android_ndk-v3-4-4305590795b2@arm.com
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: James Clark <james.clark@linaro.org>
Cc: linux-riscv@lists.infradead.org
Cc: llvm@lists.linux.dev
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-perf-users@vger.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: Leo-Yan

tools/perf/scripts/perl/Perf-Trace-Util/Build

@@ -2,7 +2,7 @@ perf-util-y += Context.o
 
 CFLAGS_Context.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-bad-function-cast -Wno-declaration-after-statement -Wno-switch-enum
 CFLAGS_Context.o += -Wno-unused-parameter -Wno-nested-externs -Wno-undef
-CFLAGS_Context.o += -Wno-switch-default -Wno-shadow
+CFLAGS_Context.o += -Wno-switch-default -Wno-shadow -Wno-thread-safety-analysis
 
 ifeq ($(CC_NO_CLANG), 1)
   CFLAGS_Context.o += -Wno-unused-command-line-argument

tools/perf/util/scripting-engines/Build

@@ -3,7 +3,7 @@ ifeq ($(CONFIG_LIBTRACEEVENT),y)
 endif
 perf-util-$(CONFIG_LIBPYTHON) += trace-event-python.o
 
-CFLAGS_trace-event-perl.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow -Wno-nested-externs -Wno-undef -Wno-switch-default -Wno-bad-function-cast -Wno-declaration-after-statement -Wno-switch-enum
+CFLAGS_trace-event-perl.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow -Wno-nested-externs -Wno-undef -Wno-switch-default -Wno-bad-function-cast -Wno-declaration-after-statement -Wno-switch-enum -Wno-thread-safety-analysis
 
 # -Wno-declaration-after-statement: The python headers have mixed code with declarations (decls after asserts, for instance)
 CFLAGS_trace-event-python.o += $(PYTHON_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow -Wno-deprecated-declarations -Wno-switch-enum -Wno-declaration-after-statement