[libc-commits] [libc] [libc][cmake] Remove dependencies for bare-metal hermetic testing (PR #192242)

[via libc-commits]

https://github.com/dcandler created https://github.com/llvm/llvm-project/pull/192242

Unit tests can be disabled on bare-metal as they will fail to build. To prevent the check-libc and check-libc-lit targets from always attempting to build them, the dependencies are now set conditionally according to the relevant CMake options.

>From 1f0d1d4a24570fb7c5d498783484d0e536aed6cf Mon Sep 17 00:00:00 2001
From: David Candler <david.candler at arm.com>
Date: Wed, 15 Apr 2026 12:34:34 +0100
Subject: [PATCH] [libc][cmake] Remove dependencies for bare-metal hermetic
 testing

Unit tests can be disabled on bare-metal as they will fail to build.
To prevent the check-libc and check-libc-lit targets from always
attempting to build them, the dependencies are now set conditionally
according to the relevant CMake options.
---
 libc/CMakeLists.txt      |  2 ++
 libc/test/CMakeLists.txt | 11 +++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 5b5fe981f2195..e796598e48924 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -272,6 +272,8 @@ endif()
 if(LIBC_TARGET_OS_IS_GPU)
   include(prepare_libc_gpu_build)
   set(LIBC_ENABLE_UNITTESTS OFF)
+elseif(LIBC_TARGET_OS_IS_BAREMETAL)
+  set(LIBC_ENABLE_UNITTESTS OFF)
 endif()
 
 include(LLVMLibCCheckMPFR)
diff --git a/libc/test/CMakeLists.txt b/libc/test/CMakeLists.txt
index 5a154008c1867..dcfae50790c2e 100644
--- a/libc/test/CMakeLists.txt
+++ b/libc/test/CMakeLists.txt
@@ -1,7 +1,6 @@
 add_custom_target(check-libc)
 add_custom_target(libc-unit-tests)
 add_custom_target(libc-hermetic-tests)
-add_dependencies(check-libc libc-unit-tests libc-hermetic-tests)
 
 if (TARGET check-hdrgen)
   add_dependencies(check-libc check-hdrgen)
@@ -35,9 +34,17 @@ configure_lit_site_cfg(
 add_lit_testsuite(check-libc-lit
   "Running libc tests via lit"
   ${LIBC_BUILD_DIR}/test
-  DEPENDS libc-unit-tests-build libc-hermetic-tests-build libc-integration-tests-build libc_include_tests-build
 )
 
+if(LIBC_ENABLE_UNITTESTS AND NOT LIBC_TEST_HERMETIC_TEST_ONLY)
+  add_dependencies(check-libc libc-unit-tests)
+  add_dependencies(check-libc-lit libc-unit-tests-build)
+endif()
+if(LIBC_ENABLE_HERMETIC_TESTS AND NOT LIBC_TEST_UNIT_TEST_ONLY)
+  add_dependencies(check-libc libc-hermetic-tests)
+  add_dependencies(check-libc-lit libc-hermetic-tests-build)
+endif()
+
 add_subdirectory(UnitTest)
 
 if(LIBC_TARGET_OS_IS_GPU)