[libFuzzer] Support using libc++

This is needed in case the users of libFuzzer use libc++ in their
code, which the fuzz target (libFuzzer) will be linked against.
When libc++ source is available, we build a private version of it
and link it against libFuzzer which allows using the same static
library against codebases which use both libc++ and libstdc++.

Differential Revision: https://reviews.llvm.org/D37631

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@322604 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 9 deletions

diff --git a/lib/fuzzer/FuzzerInterface.h b/lib/fuzzer/FuzzerInterface.h
index c2c0a3984..0f7effb2a 100644
--- a/lib/fuzzer/FuzzerInterface.h
+++ b/lib/fuzzer/FuzzerInterface.h
@@ -30,35 +30,39 @@ extern "C" {
 // Executes the code under test with [Data, Data+Size) as the input.
 // libFuzzer will invoke this function *many* times with different inputs.
 // Must return 0.
-int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
+__attribute__((visibility("default"))) int
+LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
 
 // Optional user-provided initialization function.
 // If provided, this function will be called by libFuzzer once at startup.
 // It may read and modify argc/argv.
 // Must return 0.
-int LLVMFuzzerInitialize(int *argc, char ***argv);
+__attribute__((visibility("default"))) int LLVMFuzzerInitialize(int *argc,
+                                                                char ***argv);
 
 // Optional user-provided custom mutator.
 // Mutates raw data in [Data, Data+Size) inplace.
 // Returns the new size, which is not greater than MaxSize.
 // Given the same Seed produces the same mutation.
-size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize,
-                               unsigned int Seed);
+__attribute__((visibility("default"))) size_t
+LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size, size_t MaxSize,
+                        unsigned int Seed);
 
 // Optional user-provided custom cross-over function.
 // Combines pieces of Data1 & Data2 together into Out.
 // Returns the new size, which is not greater than MaxOutSize.
 // Should produce the same mutation given the same Seed.
-size_t LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
-                                 const uint8_t *Data2, size_t Size2,
-                                 uint8_t *Out, size_t MaxOutSize,
-                                 unsigned int Seed);
+__attribute__((visibility("default"))) size_t
+LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
+                          const uint8_t *Data2, size_t Size2, uint8_t *Out,
+                          size_t MaxOutSize, unsigned int Seed);
 
 // Experimental, may go away in future.
 // libFuzzer-provided function to be used inside LLVMFuzzerCustomMutator.
 // Mutates raw data in [Data, Data+Size) inplace.
 // Returns the new size, which is not greater than MaxSize.
-size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
+__attribute__((visibility("default"))) size_t
+LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
 
 #ifdef __cplusplus
 }  // extern "C"