Date:   Fri, 10 Mar 2023 22:57:48 -0800
In-Reply-To: <20230311065753.3012826-1-irogers@google.com>
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Subject: [PATCH v1 08/13] tools build: Add feature test for abi::__cxa_demangle
From:   Ian Rogers <irogers@google.com>
To:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>,
        Roberto Sassu <roberto.sassu@huawei.com>,
        Quentin Monnet <quentin@isovalent.com>,
        Andres Freund <andres@anarazel.de>,
        Tiezhu Yang <yangtiezhu@loongson.cn>,
        Pavithra Gurushankar <gpavithrasha@gmail.com>,
        Yang Jihong <yangjihong1@huawei.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Leo Yan <leo.yan@linaro.org>,
        "=?UTF-8?q?Martin=20Li=C5=A1ka?=" <mliska@suse.cz>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        llvm@lists.linux.dev
Cc:     Stephane Eranian <eranian@google.com>,
        Ian Rogers <irogers@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

cxxabi.h is part of libsdtc++ and LLVM's libcxx, providing
abi::__cxa_demangle a portable C++ demangler. Add a feature test to
detect that the function is available.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/build/Makefile.feature              |  1 +
 tools/build/feature/Makefile              |  4 ++++
 tools/build/feature/test-cxa-demangle.cpp | 17 +++++++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 tools/build/feature/test-cxa-demangle.cpp

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 38f8851bd7cb..214622d7537c 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -80,6 +80,7 @@ FEATURE_TESTS_EXTRA :=                  \
          compile-32                     \
          compile-x32                    \
          cplus-demangle                 \
+         cxa-demangle                   \
          gtk2                           \
          gtk2-infobar                   \
          hello                          \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index dc9323e01e42..0a3b9281f8b0 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -23,6 +23,7 @@ FILES=                                          \
          test-libbfd-liberty.bin                \
          test-libbfd-liberty-z.bin              \
          test-cplus-demangle.bin                \
+         test-cxa-demangle.bin                  \
          test-libcap.bin			\
          test-libelf.bin                        \
          test-libelf-getphdrnum.bin             \
@@ -262,6 +263,9 @@ $(OUTPUT)test-libbfd-liberty-z.bin:
 $(OUTPUT)test-cplus-demangle.bin:
 	$(BUILD) -liberty
 
+$(OUTPUT)test-cxa-demangle.bin:
+	$(BUILDXX)
+
 $(OUTPUT)test-backtrace.bin:
 	$(BUILD)
 
diff --git a/tools/build/feature/test-cxa-demangle.cpp b/tools/build/feature/test-cxa-demangle.cpp
new file mode 100644
index 000000000000..a3e712f65c37
--- /dev/null
+++ b/tools/build/feature/test-cxa-demangle.cpp
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <cxxabi.h>
+
+int main(void)
+{
+  size_t len = 256;
+  char *output = (char*)malloc(len);
+        int status;
+
+        output = abi::__cxa_demangle("FieldName__9ClassNameFd", output, &len, &status);
+
+        printf("demangled symbol: {%s}\n", output);
+
+        return 0;
+}
-- 
2.40.0.rc1.284.g88254d51c5-goog