[cmake] Use LLVM_ENABLE_ASSERTIONS to enable assertions in libstdc++
On my machine this showed no new failures in check-llvm and increased
the testing time from 138 to 142 seconds, for a Release build with
assertions enabled.
Differential Revision: https://reviews.llvm.org/D142279
diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 6119ecd..7173e27 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -81,6 +81,8 @@
endforeach()
endif()
endif()
+ # Enable assertions in libstdc++.
+ add_compile_definitions(_GLIBCXX_ASSERTIONS)
endif()
if(LLVM_ENABLE_EXPENSIVE_CHECKS)
