[libcxx][CI][AIX] Switch to LLVM_ENABLE_RUNTIMES
and to the new `runtimes` top level CMakeLists.txt since the old path is now deprecated. This requires a slight adjustment of the libcxxabi CMake, since there are required macro definitions we previously got via the `llvm/CMakeList.txt` path.
Reviewed By: ldionne, #libc, #libc_abi
Differential Revision: https://reviews.llvm.org/D113403
GitOrigin-RevId: 2b416b46479d2dbe749e90d7c5344f05b4e35abc
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 027dafd..79862b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -519,6 +519,12 @@
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LIBCXXABI_CXX_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBCXXABI_C_FLAGS}")
+# On AIX, avoid picking up VMX extensions(i.e. vec_malloc) which would change
+# the default alignment of the allocators here.
+if (UNIX AND ${CMAKE_SYSTEM_NAME} MATCHES "AIX")
+ add_definitions("-D_XOPEN_SOURCE=700")
+endif()
+
#===============================================================================
# Setup Source Code
#===============================================================================
