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[CMake] Add error to clarify that lldb requires libcxx 

Summary:
This adds a specific error message to clarify that lldb requires libcxx when
built together with clang on macOS. In addition, the lldb building docs are also
updated.

Fixes https://bugs.llvm.org/show_bug.cgi?id=41866

Reviewers: sgraenitz, JDevlieghere, EricWF

Reviewed By: sgraenitz

Subscribers: mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D61877

llvm-svn: 360756
This commit is contained in:
Stefan Granitz 2019-05-15 08:59:02 +00:00
parent d9d0665d1c
commit a5588c4583
2 changed files with 24 additions and 0 deletions
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18
lldb/CMakeLists.txt
View File

@ -124,6 +124,24 @@ if(LLDB_INCLUDE_TESTS)
message(WARNING "LLDB test suite requires libc++ in llvm/projects/libcxx or an existing build symlinked to ${cxx_dir}")
endif()
else()
# We require libcxx for the test suite, so if we aren't building it,
# try to provide a helpful error about how to resolve the situation.
if(NOT TARGET cxx)
if(LLVM_ENABLE_PROJECTS STREQUAL "")
# If `LLVM_ENABLE_PROJECTS` is not being used (implying that we are
# using the old layout), suggest checking it out.
message(FATAL_ERROR
"LLDB test suite requires libc++, but it is currently disabled. "
"Please checkout `libcxx` in `llvm/projects` or disable tests "
"via `LLDB_INCLUDE_TESTS=OFF`.")
else()
# If `LLVM_ENABLE_PROJECTS` is being used, suggest adding it.
message(FATAL_ERROR
"LLDB test suite requires libc++, but it is currently disabled. "
"Please add `libcxx` to `LLVM_ENABLE_PROJECTS` or disable tests "
"via `LLDB_INCLUDE_TESTS=OFF`.")
endif()
endif()
list(APPEND LLDB_TEST_DEPS cxx)
endif()
endif()

6
lldb/docs/resources/build.rst
View File

@ -151,6 +151,12 @@ variables to cmake to change build behavior. If LLDB is built as a part of
LLVM, then you can pass LLVM-specific CMake variables to cmake when building
LLDB.
If you are building both Clang and LLDB together, be sure to also add libc++,
which is currently required for testing on macOS:
::
> cmake -D LLVM_ENABLE_PROJECTS='clang;lldb;libcxx' $PATH_TO_LLVM -G Ninja
Here are some commonly used LLDB-specific CMake variables: