[libcxx-commits] [libcxx] [libcxx][libc] Remove last LLVM-libc carveout (PR #230294)

[Michael Jones via libcxx-commits]

https://github.com/michaelrj-google created https://github.com/llvm/llvm-project/pull/230294

This PR removes the FILESYSTEM carveout, which was the last one that was
blocking LLVM-libc. It also enables the unwinder and RTTI.


>From fe68c2e5028f75009beaa88e4861dff7d089b7c7 Mon Sep 17 00:00:00 2001
From: Michael Jones <michaelrj at google.com>
Date: Thu, 8 Oct 2026 21:33:29 +0000
Subject: [PATCH 1/2] [libcxx][libc] Remove last LLVM-libc carveout

This PR removes the FILESYSTEM carveout, which was the last one that was
blocking LLVM-libc. It also enables the unwinder and RTTI.
---
 libcxx/cmake/caches/Generic-llvm-libc.cmake | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/libcxx/cmake/caches/Generic-llvm-libc.cmake b/libcxx/cmake/caches/Generic-llvm-libc.cmake
index 864cf8989aec18..0ffa80a1b59bf8 100644
--- a/libcxx/cmake/caches/Generic-llvm-libc.cmake
+++ b/libcxx/cmake/caches/Generic-llvm-libc.cmake
@@ -23,23 +23,20 @@ set(COMPILER_RT_DEBUG OFF CACHE BOOL "")
 set(COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY ON CACHE BOOL "")
 
 set(LIBCXXABI_USE_COMPILER_RT ON CACHE BOOL "")
-set(LIBCXXABI_USE_LLVM_UNWINDER OFF CACHE BOOL "")
+set(LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
+set(LIBCXXABI_ENABLE_STATIC_UNWINDER ON CACHE BOOL "")
 set(LIBCXX_ENABLE_SHARED OFF CACHE BOOL "")
 set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
 set(LIBCXX_INCLUDE_BENCHMARKS OFF CACHE BOOL "")
 
 set(LIBCXX_ENABLE_STATIC ON CACHE BOOL "")
+set(LIBCXX_ENABLE_STATIC_ABI_LIBRARY ON CACHE BOOL "")
 set(LIBCXX_INSTALL_LIBRARY ON CACHE BOOL "")
 set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
 
-# Still missing some components.
-set(LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
-
-
 set(LIBCXX_ENABLE_UNICODE ON CACHE BOOL "")
 set(LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
 set(LIBCXXABI_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
-set(LIBCXX_ENABLE_RTTI OFF CACHE BOOL "")
 set(RUNTIMES_USE_LIBC "llvm-libc" CACHE STRING "")
 
 set(CMAKE_BUILD_TYPE "Release" CACHE STRING "")

>From 9661c4076a244c3d2cd4004d8641a02c8d29fde2 Mon Sep 17 00:00:00 2001
From: Michael Jones <michaelrj at google.com>
Date: Thu, 8 Oct 2026 21:51:11 +0000
Subject: [PATCH 2/2] XFAIL the test with no outstanding PR

---
 .../time.zone.members/sys_info.zdump.pass.cpp                  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libcxx/test/std/time/time.zone/time.zone.timezone/time.zone.members/sys_info.zdump.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.timezone/time.zone.members/sys_info.zdump.pass.cpp
index b474fe50083b1d..8d49288a798e08 100644
--- a/libcxx/test/std/time/time.zone/time.zone.timezone/time.zone.members/sys_info.zdump.pass.cpp
+++ b/libcxx/test/std/time/time.zone/time.zone.timezone/time.zone.members/sys_info.zdump.pass.cpp
@@ -13,6 +13,9 @@
 // XFAIL: libcpp-has-no-experimental-tzdb
 // XFAIL: availability-tzdb-missing
 
+// tzdata mismatch on Africa/Casablanca in 2099
+// XFAIL: LLVM-LIBC-FIXME
+
 #include <chrono>
 #include <format>
 #include <fstream>