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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/
in CIFactory:
- Add -fno-threadsafe-statics flag (for Windows only), to prevent potential unresolved symbols at run-time
in MetaProcessor::readInputFromFile:
- add required std::ifstream::binary flag when opening the std::ifstream
- add missing backslashes
in PlatformWin:
- properly format error messages
- in IsDLL(): check and return false if the file size is 0
- fix _CxxThrowException symbol name (not fully understood - to be reviewed)
- filter out a couple of system dlls when looking for symbols
Decouple redirection state from MetaProcessor and MaybeRedirectOutputRAII.
Only suspend redirection when writing to the prompt.
Allow user to redirect to files named 1, 2, &1, &2.
Allow stderr and stdout to be redirected to one another.
Don't create _IO_2_1_stdout_ file.
