[CMake] Fix -Wstrict-prototypes
Fixes warnings (or errors, if someone injects -Werror in their build system,
which happens in fact with some folks vendoring LLVM too) with Clang 16:
```
+/var/tmp/portage.notmp/portage/sys-devel/llvm-15.0.4/work/llvm_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c:3:9: warning: a function declaration without a prototype
is deprecated in all versions of C [-Wstrict-prototypes]
-/var/tmp/portage.notmp/portage/sys-devel/llvm-14.0.4/work/llvm_build-abi_x86_64.amd64/CMakeFiles/CMakeTmp/src.c:3:9: error: a function declaration without a prototype is
deprecated in all versions of C [-Werror,-Wstrict-prototypes]
int main() {return 0;}
^
void
```
Differential Revision: https://reviews.llvm.org/D137503
GitOrigin-RevId: 32a2af44e1e882f13d1cc2817f0a8d4d8b375d4d
diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
index e250687..e372da0 100644
--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
+++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
@@ -116,7 +116,7 @@
if(NOT TEST_COMPILE_ONLY)
message(STATUS "Finding valid architectures for ${os}...")
set(SIMPLE_C ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/src.c)
- file(WRITE ${SIMPLE_C} "#include <stdio.h>\nint main() { printf(__FILE__); return 0; }\n")
+ file(WRITE ${SIMPLE_C} "#include <stdio.h>\nint main(void) { printf(__FILE__); return 0; }\n")
set(os_linker_flags)
foreach(flag ${DARWIN_${os}_LINK_FLAGS})
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index da86bdc..f6190ee 100644
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -224,7 +224,7 @@
# runtime libraries supported by our current compilers cross-compiling
# abilities.
set(SIMPLE_SOURCE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/simple.cc)
-file(WRITE ${SIMPLE_SOURCE} "#include <stdlib.h>\n#include <stdio.h>\nint main() { printf(\"hello, world\"); }\n")
+file(WRITE ${SIMPLE_SOURCE} "#include <stdlib.h>\n#include <stdio.h>\nint main(void) { printf(\"hello, world\"); }\n")
# Detect whether the current target platform is 32-bit or 64-bit, and setup
# the correct commandline flags needed to attempt to target 32-bit and 64-bit.
diff --git a/lib/builtins/CMakeLists.txt b/lib/builtins/CMakeLists.txt
index fd3d395..42015ef 100644
--- a/lib/builtins/CMakeLists.txt
+++ b/lib/builtins/CMakeLists.txt
@@ -755,7 +755,7 @@
SOURCE "#if !(__ARM_FP & 0x8)
#error No double-precision support!
#endif
- int main() { return 0; }")
+ int main(void) { return 0; }")
if(NOT COMPILER_RT_HAS_${arch}_VFP_DP)
list(REMOVE_ITEM ${arch}_SOURCES ${arm_Thumb1_VFPv2_DP_SOURCES})
endif()
