https://github.com/ldionne created 
https://github.com/llvm/llvm-project/pull/171474

This patch adds an installation step where we install libc++ in a fake 
installation tree before testing libunwind. This is necessary because some 
configurations (in particular "generic-merged") require libc++ to be installed, 
since the libunwind tests are actually linking libc++.so in which libc++abi.a 
and libunwind.a have been merged.

>From be09c5985dfff239132e08951c34c048987617c2 Mon Sep 17 00:00:00 2001
From: Louis Dionne <[email protected]>
Date: Tue, 9 Dec 2025 11:04:36 -0500
Subject: [PATCH] [libunwind] Make sure libunwind test dependencies are
 installed before running tests

This patch adds an installation step where we install libc++ in a fake
installation tree before testing libunwind. This is necessary because
some configurations (in particular "generic-merged") require libc++ to
be installed, since the libunwind tests are actually linking libc++.so
in which libc++abi.a and libunwind.a have been merged.
---
 libunwind/CMakeLists.txt      |  3 +++
 libunwind/test/CMakeLists.txt | 23 ++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index 97edff0b87ea3..fbef71f3f7446 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -336,6 +336,9 @@ if (RUNTIMES_EXECUTE_ONLY_CODE)
   add_compile_definitions(_LIBUNWIND_EXECUTE_ONLY_CODE)
 endif()
 
+add_custom_target(unwind-test-depends
+  COMMENT "Build dependencies required to run the libunwind test suite.")
+
 
#===============================================================================
 # Setup Source Code
 
#===============================================================================
diff --git a/libunwind/test/CMakeLists.txt b/libunwind/test/CMakeLists.txt
index c222c0bdbf5af..815bc86692860 100644
--- a/libunwind/test/CMakeLists.txt
+++ b/libunwind/test/CMakeLists.txt
@@ -9,6 +9,26 @@ macro(pythonize_bool var)
 endmacro()
 
 set(LIBUNWIND_TESTING_INSTALL_PREFIX 
"${LIBUNWIND_BINARY_DIR}/test-suite-install")
+add_custom_target(libunwind-install-cxx-for-testing
+                    DEPENDS cxx-headers
+                            cxx
+                            cxx_experimental
+                            cxx-modules
+                    COMMAND ${CMAKE_COMMAND} -E make_directory 
"${LIBUNWIND_TESTING_INSTALL_PREFIX}"
+                    COMMAND "${CMAKE_COMMAND}"
+                            -DCMAKE_INSTALL_COMPONENT=cxx-headers
+                            
-DCMAKE_INSTALL_PREFIX="${LIBUNWIND_TESTING_INSTALL_PREFIX}"
+                            -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
+                    COMMAND "${CMAKE_COMMAND}"
+                            -DCMAKE_INSTALL_COMPONENT=cxx-modules
+                            
-DCMAKE_INSTALL_PREFIX="${LIBUNWIND_TESTING_INSTALL_PREFIX}"
+                            -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
+                    COMMAND "${CMAKE_COMMAND}"
+                            -DCMAKE_INSTALL_COMPONENT=cxx
+                            
-DCMAKE_INSTALL_PREFIX="${LIBUNWIND_TESTING_INSTALL_PREFIX}"
+                            -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
+add_dependencies(unwind-test-depends libunwind-install-cxx-for-testing)
+
 add_custom_target(libunwind-install-unwind-for-testing
   DEPENDS unwind-headers
           unwind
@@ -21,6 +41,7 @@ add_custom_target(libunwind-install-unwind-for-testing
           -DCMAKE_INSTALL_COMPONENT=unwind
           -DCMAKE_INSTALL_PREFIX="${LIBUNWIND_TESTING_INSTALL_PREFIX}"
           -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
+add_dependencies(unwind-test-depends libunwind-install-unwind-for-testing)
 
 pythonize_bool(LIBUNWIND_ENABLE_CET)
 pythonize_bool(LIBUNWIND_ENABLE_GCS)
@@ -62,4 +83,4 @@ configure_lit_site_cfg(
 
 add_lit_testsuite(check-unwind "Running libunwind tests"
   ${CMAKE_CURRENT_BINARY_DIR}
-  DEPENDS libunwind-install-unwind-for-testing)
+  DEPENDS unwind-test-depends)

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