[libFuzzer] add linux-specific test for gc-sections

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@313421 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 27 insertions, 0 deletions

diff --git a/test/fuzzer/GcSectionsTest.cpp b/test/fuzzer/GcSectionsTest.cpp
new file mode 100644
index 000000000..fd9da7735
--- /dev/null
+++ b/test/fuzzer/GcSectionsTest.cpp
@@ -0,0 +1,14 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Simple test for a fuzzer.
+// The unused function should not be present in the binary.
+#include <cstddef>
+#include <cstdint>
+
+extern "C" void UnusedFunctionShouldBeRemovedByLinker() { }
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  return 0;
+}
+
diff --git a/test/fuzzer/gc-sections.test b/test/fuzzer/gc-sections.test
new file mode 100644
index 000000000..8785bb00e
--- /dev/null
+++ b/test/fuzzer/gc-sections.test
@@ -0,0 +1,13 @@
+REQUIRES: linux
+
+No gc-sections:
+RUN: %cpp_compiler %S/GcSectionsTest.cpp -o %t
+RUN: nm %t | grep UnusedFunctionShouldBeRemovedByLinker | count 1
+
+With gc-sections. Currently, we can't remove unused code.
+DISABLED: %cpp_compiler %S/GcSectionsTest.cpp -o %t -ffunction-sections -Wl,-gc-sections
+DISABLED: nm %t | grep UnusedFunctionShouldBeRemovedByLinker | count 1
+
+With gc sections, with trace-pc. Unused code is removed.
+RUN: %cpp_compiler %S/GcSectionsTest.cpp -o %t -fsanitize-coverage=0 -fsanitize-coverage=trace-pc -ffunction-sections -Wl,-gc-sections
+RUN: nm %t | not grep UnusedFunctionShouldBeRemovedByLinker