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# --- CheckClangBlocks.cmake ---
# Detect support for Clang Blocks (Clang or AppleClang)
# Defines: HAVE_CLANG_BLOCKS (0 or 1)
# Defines: CLANG_BLOCKS_LIB (empty or "BlocksRuntime")
# Default
set(HAVE_CLANG_BLOCKS 0)
set(CLANG_BLOCKS_LIB "")
if (CMAKE_C_COMPILER_ID MATCHES "Clang")
# AppleClang: Blocks are built-in
if (CMAKE_C_COMPILER_ID STREQUAL "AppleClang")
message(STATUS "AppleClang detected — Blocks support is built in")
set(HAVE_CLANG_BLOCKS 1)
set(CLANG_BLOCKS_LIB "")
else()
# LLVM Clang: must test for -fblocks and libBlocksRuntime
message(STATUS "LLVM Clang detected — checking for BlocksRuntime")
include(CheckCSourceCompiles)
set(CMAKE_REQUIRED_FLAGS "-fblocks")
set(CMAKE_REQUIRED_LIBRARIES "BlocksRuntime")
check_c_source_compiles("
#include <Block.h>
int main(void) {
void (^b)(void) = ^{ };
b();
return 0;
}
" HAVE_WORKING_CLANG_BLOCKS)
unset(CMAKE_REQUIRED_FLAGS)
unset(CMAKE_REQUIRED_LIBRARIES)
if (HAVE_WORKING_CLANG_BLOCKS)
message(STATUS "Clang Blocks support ENABLED")
set(HAVE_CLANG_BLOCKS 1)
set(CLANG_BLOCKS_LIB "BlocksRuntime")
else()
message(WARNING
"libBlocksRuntime not found — Clang Blocks disabled")
set(HAVE_CLANG_BLOCKS 0)
set(CLANG_BLOCKS_LIB "")
endif()
endif()
endif()
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