[llvm-branch-commits] [libcxx] release/19.x: [libc++] Improve behavior when using relative path for LIBCXX_ASSERTION_HANDLER_FILE (#100157) (PR #100411)

[Tobias Hieta via llvm-branch-commits]

https://github.com/tru updated https://github.com/llvm/llvm-project/pull/100411

>From 5c03c4fc269039dad8db96c298aaacf819b32125 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Wed, 24 Jul 2024 11:03:52 -0500
Subject: [PATCH] [libc++] Improve behavior when using relative path for
 LIBCXX_ASSERTION_HANDLER_FILE (#100157)

Fixes #80696

(cherry picked from commit 046a17717d9c5b5385ecd914621b48bdd91524d0)
---
 libcxx/CMakeLists.txt          | 8 ++++++--
 libcxx/docs/BuildingLibcxx.rst | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 332816b15260a..674082c7d1787 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -71,12 +71,16 @@ if (NOT "${LIBCXX_HARDENING_MODE}" IN_LIST LIBCXX_SUPPORTED_HARDENING_MODES)
     "Unsupported hardening mode: '${LIBCXX_HARDENING_MODE}'. Supported values are ${LIBCXX_SUPPORTED_HARDENING_MODES}.")
 endif()
 set(LIBCXX_ASSERTION_HANDLER_FILE
-  "${CMAKE_CURRENT_SOURCE_DIR}/vendor/llvm/default_assertion_handler.in"
+  "vendor/llvm/default_assertion_handler.in"
   CACHE STRING
   "Specify the path to a header that contains a custom implementation of the
    assertion handler that gets invoked when a hardening assertion fails. If
    provided, this header will be included by the library, replacing the
-   default assertion handler.")
+   default assertion handler. If this is specified as a relative path, it
+   is assumed to be relative to '<monorepo>/libcxx'.")
+if (NOT IS_ABSOLUTE "${LIBCXX_ASSERTION_HANDLER_FILE}")
+  set(LIBCXX_ASSERTION_HANDLER_FILE "${CMAKE_CURRENT_SOURCE_DIR}/${LIBCXX_ASSERTION_HANDLER_FILE}")
+endif()
 option(LIBCXX_ENABLE_RANDOM_DEVICE
   "Whether to include support for std::random_device in the library. Disabling
    this can be useful when building the library for platforms that don't have
diff --git a/libcxx/docs/BuildingLibcxx.rst b/libcxx/docs/BuildingLibcxx.rst
index 66bb19bb5b2cd..5c224689e0f9f 100644
--- a/libcxx/docs/BuildingLibcxx.rst
+++ b/libcxx/docs/BuildingLibcxx.rst
@@ -406,7 +406,8 @@ libc++ Feature Options
   Specify the path to a header that contains a custom implementation of the
   assertion handler that gets invoked when a hardening assertion fails. If
   provided, this header will be included by the library, replacing the
-  default assertion handler.
+  default assertion handler. If this is specified as a relative path, it
+  is assumed to be relative to ``<monorepo>/libcxx``.
 
 
 libc++ ABI Feature Options