From 41c8fcc30c729d442e7fa84a6b7556480523888d Mon Sep 17 00:00:00 2001
From: Andrew Noyes <andrew@weaselab.dev>
Date: Thu, 22 May 2025 16:32:45 -0400
Subject: [PATCH] Fix gcc build

---
 CMakeLists.txt | 19 ++++++++++++++-----
 src/parser3.h  |  6 +++++-
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb7e7a4..98d1ece 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,11 +49,20 @@ target_include_directories(mytest PRIVATE include)
 target_link_libraries(mytest PRIVATE doctest nanobench simdjson)
 doctest_discover_tests(mytest)
 
-add_executable(fuzz src/fuzz.cpp)
-target_include_directories(fuzz PRIVATE include)
-target_link_libraries(fuzz PRIVATE simdjson)
-target_compile_options(fuzz PRIVATE -fsanitize=fuzzer)
-target_link_options(fuzz PRIVATE -fsanitize=fuzzer)
+include(CMakePushCheckState)
+include(CheckCXXCompilerFlag)
+cmake_push_check_state()
+set(CMAKE_REQUIRED_LINK_OPTIONS -fsanitize=fuzzer-no-link)
+check_cxx_compiler_flag(-fsanitize=fuzzer-no-link HAS_LIB_FUZZER)
+cmake_pop_check_state()
+
+if(HAS_LIB_FUZZER)
+  add_executable(fuzz src/fuzz.cpp)
+  target_include_directories(fuzz PRIVATE include)
+  target_link_libraries(fuzz PRIVATE simdjson)
+  target_compile_options(fuzz PRIVATE -fsanitize=fuzzer)
+  target_link_options(fuzz PRIVATE -fsanitize=fuzzer)
+endif()
 
 add_executable(validate src/validate.cpp)
 target_include_directories(validate PRIVATE include)
diff --git a/src/parser3.h b/src/parser3.h
index b27dba3..1cf5a22 100644
--- a/src/parser3.h
+++ b/src/parser3.h
@@ -414,7 +414,7 @@ inline WeaselJsonStatus n_string2(Parser3 *self) {
       }
       break;
     }
-    __m128 x;
+    __m128i x;
     memcpy(&x, self->buf, 16);
     const uint32_t dubquote =
         _mm_movemask_epi8(_mm_cmpeq_epi8(_mm_set1_epi8('"'), x));
@@ -493,6 +493,8 @@ inline WeaselJsonStatus n_string2(Parser3 *self) {
   case Tables::CONTINUATION_BYTE:
   case Tables::INVALID:
     [[unlikely]] return WeaselJson_REJECT;
+  default:
+    __builtin_unreachable();
   }
 }
 
@@ -1085,6 +1087,8 @@ inline WeaselJsonStatus Parser3::keepGoing(Parser3 *self) {
       case T_EOF:
       case N_SYMBOL_COUNT:
         break;
+      default:
+        __builtin_unreachable();
       }
       return WeaselJson_AGAIN;
     }