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We had symbols exposed, which in turn meant symbols were resolved by the dynamic loader,
which in turn meant another libllvm.so could interfere with those of cling. By hiding these
symbols, all symbols are self-contained and not external symbols leak into libCling.
cling needs to resolve its own symbols, so unhide those.
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/
- cling: add missing symbol in the export list and fix semicolon issue in CMakeList.txt (it has to be in quotes)
- cling-demo: export symbols and format hexadecimal output
This patch allows ROOT to be built against compatible external llvm (5.0
or 5.0.1). Note that we still need to build clang (eg. we require
builtin_clang=On) due to the ROOT-specific patches which are not yet
upstream.
Since we have externally installed llvm, we configure and build clang as
a standalone project. The configuration relies on finding llvm-config-5.0
and uses an adapted version of the standard clang standalone build
procedure.
Clang provides dependencies such as FileCheck and not which are used by
cling's testsuite and are not being installed with the standard llvm
package.
Cling (which depends on llvm and clang) is built as a clang tool to avoid
unresolved dependencies to clang and complicating further the already
complicated cmake setup.
This patch intends a minimal change and follows the initial (suboptimal)
design to configure and build llvm, clang and cling as part of ROOT. An
ultimate solution would be to have llvm, clang and cling built as separate
standalone projects (following the recommended way by the LLVM cmake
developers).
unless we are in a regime where CLING_INCLUDE_TESTS is defined.
This requires to re-balance the dictionary construction adding the
paths for the runtime universe.
This allows a user to prepend to CLING_INCLUDE_PATHS any additional include paths
they want to add on startup.
Refactor common path splitting code into Utils/Paths
Signed-off-by: Vassil Vassilev <vvasilev@cern.ch>
