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[llvm] Enable LLVM_LINK_LLVM_DYLIB by default on non-Windows platforms #138187

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[llvm] Enable LLVM_LINK_LLVM_DYLIB by default on non-Windows platforms #138187

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7e23666
[llvm] Enable LLVM_LINK_LLVM_DYLIB by default on non-Windows platforms
rnk Apr 30, 2025
53c1338
Merge branch 'main' into llvm-dylib-default
rnk May 2, 2025
96fddd1
Merge branch 'main' into llvm-dylib-default
rnk Jun 25, 2025
1eb025c
Remove debug prints
rnk Jun 25, 2025
788bd48
Disable linking the dylib from TestingSupport, it only uses Support
rnk Jun 26, 2025
2f1529f
Add release notes
rnk Jun 26, 2025
5904206
Remove bolt unittest dep on LLVMTestingSupport to fix link
rnk Jun 26, 2025
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12 changes: 10 additions & 2 deletions llvm/CMakeLists.txt
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Expand Up @@ -919,14 +919,22 @@ if(NOT MSVC OR LLVM_BUILD_LLVM_DYLIB_VIS)
set(CAN_BUILD_LLVM_DYLIB ON)
endif()

cmake_dependent_option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library" OFF
# Link the tools against the libllvm DSO by default.
set(LLVM_LINK_LLVM_DYLIB_default ON)
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As mentioned on the RFC thread, the deployment story on AIX does not work well with such a configuration (due to lack of relative rpath support).

if (BUILD_SHARED_LIBS OR WIN32)
set(LLVM_LINK_LLVM_DYLIB_default OFF)
endif()

cmake_dependent_option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library"
"${LLVM_LINK_LLVM_DYLIB_default}"
"CAN_BUILD_LLVM_DYLIB" OFF)

set(LLVM_BUILD_LLVM_DYLIB_default OFF)
if(LLVM_LINK_LLVM_DYLIB OR LLVM_BUILD_LLVM_C_DYLIB)
set(LLVM_BUILD_LLVM_DYLIB_default ON)
endif()
cmake_dependent_option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_BUILD_LLVM_DYLIB_default}
cmake_dependent_option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library"
"${LLVM_BUILD_LLVM_DYLIB_default}"
"CAN_BUILD_LLVM_DYLIB" OFF)

cmake_dependent_option(LLVM_DYLIB_EXPORT_INLINES "Force inline members of classes to be DLL exported when
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5 changes: 5 additions & 0 deletions llvm/docs/ReleaseNotes.md
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Expand Up @@ -90,6 +90,11 @@ Changes to LLVM infrastructure
Changes to building LLVM
------------------------

* On non-Windows platforms, LLVM now builds as a large shared library, libLLVM,
by default. To revert to the old behavior of producing and linking static
libraries, pass ``-DLLVM_LINK_LLVM_DYLIB=OFF`` to CMake when configuring your
build.

Changes to TableGen
-------------------

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