shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions 6 Packages Projects Releases Wiki Activity

[libc] Fix build failures in fuzzing tests (#185017)

Browse Source 
The tests:
 - __support/freelist_heap_fuzz.cpp
 - fuzzing/string/strlen_fuzz.cpp

had build failures for different reasons. This patch fixes these
failures.

freelist_heap_fuzz.cpp had this error:

```
llvm-project/libc/fuzzing/__support/freelist_heap_fuzz.cpp:150:26: error: use of undeclared identifier 'Block'; did you mean '__llvm_libc_23_0_0_git::Block'?
  150 |       size_t alignment = Block::MIN_ALIGN;
      |                          ^~~~~
      |                          __llvm_libc_23_0_0_git::Block
```

The issue stems from the fact that Block was not available in scope. It
needs to be referenced via LIBC_NAMESPACE.

strlen_fuzz.cpp had this error:

```
In file included from Workspace/llvm-project/libc/fuzzing/string/strlen_fuzz.cpp:14:
In file included from /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/cstdint:38:
In file included from /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13/bits/c++config.h:679:
/usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13/bits/os_defines.h:44:5: error: function-like macro '__GLIBC_PREREQ' is not defined
   44 | #if __GLIBC_PREREQ(2,15) && defined(_GNU_SOURCE)

```

This issue is more cryptic to me, but I managed to fix it by changing
the includes from cstdint and cstring to stdint.h and string.h.
This commit is contained in:
Victor Campos 2026-03-16 11:14:57 +00:00 committed by GitHub
parent 2708cd9db2
commit 6c2b155f4f
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libc/fuzzing/__support/freelist_heap_fuzz.cpp
View File

@ -26,6 +26,7 @@ _end:
__llvm_libc_heap_limit:
)");
using LIBC_NAMESPACE::Block;
using LIBC_NAMESPACE::FreeListHeap;
using LIBC_NAMESPACE::inline_memset;
using LIBC_NAMESPACE::cpp::nullopt;

4
libc/fuzzing/string/strlen_fuzz.cpp
View File

@ -11,8 +11,8 @@
//===----------------------------------------------------------------------===//
#include "src/string/strlen.h"
#include <cstdint>
#include <cstring>
#include <stdint.h>
#include <string.h>
// always null terminate the data
extern "C" size_t LLVMFuzzerMutate(uint8_t *data, size_t size, size_t max_size);