From fae7a1c18803675e70b9bf66575e1e0a6e01f6f6 Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Sat, 3 Oct 2020 10:54:28 +0200
Subject: fuzz: Configure check for main function

---
 configure.ac | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index fbf56443f1..674ed1ee73 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1165,6 +1165,20 @@ if test "x$enable_fuzz" = "xyes"; then
   use_bench=no
   use_upnp=no
   use_zmq=no
+
+  AC_MSG_CHECKING([whether main function is needed])
+  AX_CHECK_LINK_FLAG(
+    [[-fsanitize=$use_sanitizers]],
+    [AC_MSG_RESULT([no])],
+    [AC_MSG_RESULT([yes])
+     CPPFLAGS="$CPPFLAGS -DPROVIDE_MAIN_FUNCTION"],
+    [],
+    [AC_LANG_PROGRAM([[
+      #include <cstdint>
+      #include <cstddef>
+      extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { return 0; }
+      /* unterminated comment to remove the main function ...
+    ]],[[]])])
 else
   BITCOIN_QT_INIT
 
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