cmake: use the libc allocator for sanitizer builds

tcmalloc/jemalloc keep exporting the global operator new/delete even though
their malloc is shadowed by the sanitizer interceptor, so memory the sanitizer
allocated gets freed through tcmalloc and SIGSEGVs (e.g. seastar coroutine
frames). Force libc when WITH_ASAN is set.

Signed-off-by: Sun Yuechi <sunyuechi@iscas.ac.cn>

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 46a0efc680d15dd8a6c062bdde61bef139846c41..6de3055dc4fd14ce4b74a1f8505e75ca69f6d870 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -460,6 +460,10 @@ if(ALLOCATOR)
   elseif(NOT ALLOCATOR STREQUAL "libc")
     message(FATAL_ERROR "Unsupported allocator selected: ${ALLOCATOR}")
   endif()
+elseif(WITH_ASAN)
+  # Force libc: tcmalloc/jemalloc still export operator new/delete even when the
+  # sanitizer shadows malloc, so sanitizer-allocated memory is freed via tcmalloc and SIGSEGVs.
+  set(ALLOCATOR "libc")
 else(ALLOCATOR)
   find_package(gperftools 2.6.2)
   set(HAVE_LIBTCMALLOC ${gperftools_FOUND})