perf build: Add LTO build option
Add an LTO build option, that sets the appropriate CFLAGS and CXXFLAGS values. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Carsten Haitzler <carsten.haitzler@arm.com> Cc: Fangrui Song <maskray@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Cc: Tom Rix <trix@redhat.com> Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: bpf@vger.kernel.org Cc: llvm@lists.linux.dev Link: https://lore.kernel.org/r/20230724201247.748146-5-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -256,6 +256,11 @@ ifdef PARSER_DEBUG
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$(call detected_var,PARSER_DEBUG_FLEX)
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endif
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ifdef LTO
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CORE_CFLAGS += -flto
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CXXFLAGS += -flto
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endif
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# Try different combinations to accommodate systems that only have
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# python[2][3]-config in weird combinations in the following order of
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# priority from lowest to highest:
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