[libc] Fix tablegen when using a runtimes build

When using `LLVM_ENABLE_RUNTIMES=libc` we need to perform a few extra
steps to include LLVM utilities similar to if we were performing a
standalone build. Libc depends on the tablegen utilities and the LLVM
libraries when performing a full build. When using an
`LLVM_ENABLE_PROJECTS=libc` build these are included as a part of the
greater LLVM build, but here we need to perform it maunally. This patch
should allow using `LLVM_LIBC_FULL_BUILD=ON` when building with
runtimes.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D138040

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index eff5e00..377c871 100644 (file)
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -14,6 +14,12 @@ set(LIBC_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 # The top-level directory in which libc is being built.
 set(LIBC_BUILD_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
+# For a runtimes build we need to manually include tablgen and LLVM directories.
+if ("libc" IN_LIST LLVM_ENABLE_RUNTIMES)
+  include(TableGen)
+  set(LLVM_LIBC_INCLUDE_DIRS ${LLVM_MAIN_INCLUDE_DIR} ${LLVM_BINARY_DIR}/include)
+endif()
+
 # Path libc/scripts directory.
 set(LIBC_BUILD_SCRIPTS_DIR "${LIBC_SOURCE_DIR}/utils/build_scripts")
 

diff --git a/libc/utils/HdrGen/CMakeLists.txt b/libc/utils/HdrGen/CMakeLists.txt
index 75192a0..1b361f4 100644 (file)
--- a/libc/utils/HdrGen/CMakeLists.txt
+++ b/libc/utils/HdrGen/CMakeLists.txt
@@ -12,7 +12,7 @@ add_tablegen(libc-hdrgen LIBC
   PublicAPICommand.h
 )
 
-target_include_directories(libc-hdrgen PRIVATE ${LIBC_SOURCE_DIR})
+target_include_directories(libc-hdrgen PRIVATE ${LIBC_SOURCE_DIR} ${LLVM_LIBC_INCLUDE_DIRS})
 target_link_libraries(libc-hdrgen PRIVATE LibcTableGenUtil)
 
 add_subdirectory(PrototypeTestGen)

diff --git a/libc/utils/LibcTableGenUtil/CMakeLists.txt b/libc/utils/LibcTableGenUtil/CMakeLists.txt
index d2632a2..41881e7 100644 (file)
--- a/libc/utils/LibcTableGenUtil/CMakeLists.txt
+++ b/libc/utils/LibcTableGenUtil/CMakeLists.txt
@@ -4,4 +4,4 @@ add_llvm_library(
   APIIndexer.h
   LINK_COMPONENTS Support TableGen
 )
-target_include_directories(LibcTableGenUtil PUBLIC ${LIBC_SOURCE_DIR})
+target_include_directories(LibcTableGenUtil PUBLIC ${LIBC_SOURCE_DIR} ${LLVM_LIBC_INCLUDE_DIRS})