Haowei
1fee366f08
This reverts commit 42eb7db188f23625872b6f1d722979a3100d170e. This reland 3fbb037d03e7ff1ef1cd9156363e895af7caaf98 (#209922). Under CMake 4+, calling add_library(... SHARED IMPORTED) on a target platform that lacks dynamic linking support triggers a fatal error. This becomes an issue when building LLVM and runtimes for baremetal targets like armv6m-none-eabi. This patch adds the option "LLVM_OMIT_EXPORTS_FROM_CONFIG" in LLVM. When used in sub builds like LLVM runtimes, it makes CMake to skip including the LLVM and Clang exports. This mitigates the CMake 4 errors on baremetal runtimes. 42eb7db188f23625872b6f1d722979a3100d170e originally apply this flag on all runtimes build and causing issues on runtimes like intel-sycl-gpu, amdgpu-offload-ubuntu-22-cmake-build-only. This PR only set this flag when the target platform lacks shared library support. (cherry picked from a04f87fdd9b59c6089bf731c669c6f149208363c and 91406e8dff2b1578ff4dd22593ea1a8039b074a4)
C language Family Front-end
Welcome to Clang.
This is a compiler front-end for the C family of languages (C, C++ and Objective-C) which is built as part of the LLVM compiler infrastructure project.
Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer.
If you're interested in more (including how to build Clang) it is best to read the relevant websites. Here are some pointers:
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Information on Clang: http://clang.llvm.org/
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Building and using Clang: http://clang.llvm.org/get_started.html
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Clang Static Analyzer: http://clang-analyzer.llvm.org/
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Information on the LLVM project: http://llvm.org/
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If you have questions or comments about Clang, a great place to discuss them is on the Clang forums:
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If you find a bug in Clang, please file it in the LLVM bug tracker: