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authorIan Rogers <irogers@google.com>2023-04-17 22:25:46 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2023-05-26 21:25:45 +0300
commit65cd8e5534f873b76b55fb17e942c512ee3699d9 (patch)
treec52e8220752ecb00fc18d852da0ee8d2c12605f3 /tools/perf/Makefile.config
parenta0c2f92d36d20d72efb27cbe8669037321e92f22 (diff)
downloadlinux-65cd8e5534f873b76b55fb17e942c512ee3699d9.tar.xz
perf build: Don't compile demangle-cxx.cpp if not necessary
demangle-cxx.cpp requires a C++ compiler, but feature checks may fail because of the absence of this. Add a CONFIG_CXX_DEMANGLE so that the source isn't built if not supported. Copy libbfd and cplus demangle variants to a weak symbol-elf.c version so they aren't dependent on C++. These variants are only built with the build option BUILD_NONDISTRO=1. Committer note: This also handles this build break when a C++ compiler isn't available: CXX /tmp/build/perf/util/demangle-cxx.o /bin/sh: g++: command not found Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Qi Liu <liuqi115@huawei.com> Cc: Ravi Bangoria <ravi.bangoria@amd.com> Link: https://lore.kernel.org/r/20230417192546.99923-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Makefile.config')
-rw-r--r--tools/perf/Makefile.config1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 70268442f7ee..a794d9eca93d 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -927,6 +927,7 @@ ifndef NO_DEMANGLE
EXTLIBS += -lstdc++
CFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
CXXFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
+ $(call detected,CONFIG_CXX_DEMANGLE)
endif
ifdef BUILD_NONDISTRO
ifeq ($(filter -liberty,$(EXTLIBS)),)