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Enable ROOT to be built with prebuilt clang and llvm.

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To do so one needs to pass -Dbuiltin_llvm=Off -Dbuiltin_clang=Off and the
PATH should contain the path to llvm-config.

Note this is not enabling ROOT to work with vanilla clang!

This patch allows ROOT to be built against a prebuilt clang and llvm from
https://root.cern.ch/git/{llvm.git,clang.git}. It allows to reduce ROOT's
build times (in cases when cmake decides to rebuild the in-tree llvm for
no good reason). It moves the common denominator of different ROOT builds
in one place to save space. It also allows easy switch between LLVM in
debug and release mode.

To build the external clang and llvm exactly in the same way as the
in-tree builds use:

CMAKE_FLAGS="\
            -DLLVM_ENABLE_WARNINGS=OFF                   \
            -DLLVM_INCLUDE_TESTS=OFF                     \
            -DCLANG_INCLUDE_TESTS=OFF                    \
            -DLLVM_INCLUDE_EXAMPLES=OFF                  \
            -DCLANG_BUILD_TOOLS=OFF                      \
            -DCLANG_TOOL_ARCMT_TEST_BUILD=OFF            \
            -DCLANG_TOOL_CLANG_CHECK_BUILD=OFF           \
            -DCLANG_TOOL_CLANG_FORMAT_BUILD=OFF          \
            -DCLANG_TOOL_CLANG_FORMAT_VS_BUILD=OFF       \
            -DCLANG_TOOL_CLANG_FUZZER_BUILD=OFF          \
            -DCLANG_TOOL_CLANG_IMPORT_TEST_BUILD=OFF     \
            -DCLANG_TOOL_CLANG_OFFLOAD_BUNDLER_BUILD=OFF \
            -DCLANG_TOOL_CLANG_RENAME_BUILD=OFF          \
            -DCLANG_TOOL_C_ARCMT_TEST_BUILD=OFF          \
            -DCLANG_TOOL_C_INDEX_TEST_BUILD=OFF          \
            -DCLANG_TOOL_DIAGTOOL_BUILD=OFF              \
            -DCLANG_TOOL_LIBCLANG_BUILD=OFF              \
            -DCLANG_TOOL_SCAN_BUILD_BUILD=OFF            \
            -DCLANG_TOOL_SCAN_VIEW_BUILD=OFF             \
            -DLLVM_BUILD_TOOLS=OFF                       \
            -DLLVM_TOOL_LLVM_AR_BUILD=OFF                \
            -DCLANG_TOOL_CLANG_OFFLOAD_BUNDLER_BUILD=OFF \
            -DLLVM_FORCE_USE_OLD_TOOLCHAIN=ON            \
            -DCLANG_ENABLE_STATIC_ANALYZER=OFF           \
            -DCLANG_ENABLE_ARCMT=OFF                     \
            -DCLANG_ENABLE_FORMAT=OFF                    \
            -DLLVM_TARGETS_TO_BUILD=host                 \
            -DLLVM_ABI_BREAKING_CHECKS=FORCE_OFF         \
            -DLLVM_ENABLE_ABI_BREAKING_CHECKS=OFF        \
            -DCMAKE_INSTALL_PREFIX=..                    \
            -DCMAKE_BUILD_TYPE=Debug"

cmake "$CMAKE_FLAGS"   ../../../sources/root-llvm/
This commit is contained in:
Vassil Vassilev 2018-03-28 17:17:55 +02:00 committed by sftnight
parent c79fd92638
commit 6c74a386ba
3 changed files with 10 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
CMakeLists.txt
View File

@ -458,7 +458,9 @@ list(APPEND LLVM_COMMON_DEPENDS ${CLANG_TABLEGEN_TARGETS})
if (TARGET intrinsics_gen)
list(APPEND LLVM_COMMON_DEPENDS intrinsics_gen)
endif()
list(APPEND LLVM_COMMON_DEPENDS clang-headers)
if (TARGET clang-headers)
list(APPEND LLVM_COMMON_DEPENDS clang-headers)
endif()
add_subdirectory(lib)
add_subdirectory(tools)

14
lib/Interpreter/CMakeLists.txt
View File

@ -7,15 +7,17 @@
#------------------------------------------------------------------------------
set(LIBS
clangAnalysis
clangAST
clangBasic
clangCodeGen
clangDriver
clangEdit
clangFrontend
clangLex
clangParse
clangSema
clangAST
clangLex
clangSerialization
clangCodeGen
clangBasic
clingUtils
)
@ -23,6 +25,7 @@ set(LIBS
set( LLVM_LINK_COMPONENTS
analysis
core
coverage
executionengine
ipo
mc
@ -73,9 +76,6 @@ add_cling_library(clingInterpreter OBJECT
ValuePrinter.cpp
ValuePrinterSynthesizer.cpp
DEPENDS
ClangDriverOptions
LINK_LIBS
${LIBS}
)

3
lib/MetaProcessor/CMakeLists.txt
View File

@ -20,9 +20,6 @@ add_cling_library(clingMetaProcessor OBJECT
MetaProcessor.cpp
MetaSema.cpp
DEPENDS
ClangDriverOptions
LINK_LIBS
clangLex
clangAST