[clang] [clang-fuzzer-dictionary] Fix build failure with libfuzzer (PR #99871)

[Raphael Isemann via cfe-commits]

https://github.com/Teemperor created https://github.com/llvm/llvm-project/pull/99871

When building Clang with LLVM_USE_SANITIZE_COVERAGE=ON, libfuzzer is linked against the Clang fuzz targets to inject the main fuzzing loop. The clang-fuzzer-dictionary, which also resides in the same source tree as the fuzz targets, is also linked with -fsanitize=fuzzer because of this.

clang-fuzzer-dictionary is however not an actual fuzz target, but instead just a utilty binary that generates a fuzz dictionary. As it already defines a main function, the main function from libfuzzer causes the build to fail because of the duplicate definitions of main.

This patch just uses the fuzzer-no-link flags already used by the other utility binaries in this directory (i.e., the protobuf utils).

>From af818aeb37742ca6630aecde968e7102350506a8 Mon Sep 17 00:00:00 2001
From: Raphael Isemann <teemperor at gmail.com>
Date: Mon, 22 Jul 2024 14:53:46 +0200
Subject: [PATCH] [clang-fuzzer-dictionary] Fix build failure with libfuzzer

When building Clang with LLVM_USE_SANITIZE_COVERAGE=ON, libfuzzer
is linked against the Clang fuzz targets to inject the main
fuzzing loop. The clang-fuzzer-dictionary, which also resides
in the same source tree as the fuzz targets, is also linked with
-fsanitize=fuzzer because of this.

clang-fuzzer-dictionary is however not an actual fuzz target,
but instead just a utilty binary that generates a fuzz dictionary.
As it already defines a main function, the main function from
libfuzzer causes the build to fail because of the duplicate
definitions of main.

This patch just uses the fuzzer-no-link flags already used by
the other utility binaries in this directory (i.e., the protobuf
utils).
---
 clang/tools/clang-fuzzer/dictionary/CMakeLists.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/tools/clang-fuzzer/dictionary/CMakeLists.txt b/clang/tools/clang-fuzzer/dictionary/CMakeLists.txt
index ee4aa587ea54d..6b72b98f5e1c4 100644
--- a/clang/tools/clang-fuzzer/dictionary/CMakeLists.txt
+++ b/clang/tools/clang-fuzzer/dictionary/CMakeLists.txt
@@ -1,3 +1,4 @@
+set(CMAKE_CXX_FLAGS ${CXX_FLAGS_NOFUZZ})
 add_clang_executable(clang-fuzzer-dictionary
   dictionary.c
   )