[hexagon] Add dylib cmake + toolchain_only (llvm#177247)

androm3da · web-flow · commit cf4ce383b3c7 · 2026-01-27T19:34:44.000-06:00
The toolchains take up much less space when we enable dylib, so let's
create an option to build them that way.

Also: TOOLCHAIN_ONLY was ineffective in
hexagon-unknown-linux-musl-clang-cross.cmake because cmake takes the
first setting from hexagon-unknown-linux-musl-clang.cmake with
precedence. FORCE it to fix that issue.

Signed-off-by: Brian Cain &lt;brian.cain@oss.qualcomm.com&gt;
diff --git a/clang/cmake/caches/hexagon-unknown-linux-musl-clang-cross.cmake b/clang/cmake/caches/hexagon-unknown-linux-musl-clang-cross.cmake
@@ -15,4 +15,6 @@ set(CLANG_LINKS_TO_CREATE
             clang-cpp
             CACHE STRING "")
 
-set(LLVM_INSTALL_TOOLCHAIN_ONLY ON CACHE BOOL "")
+# Note: FORCE is required to override the OFF setting in hexagon-unknown-linux-musl-clang.cmake
+# which is loaded earlier in the -C chain.
+set(LLVM_INSTALL_TOOLCHAIN_ONLY ON CACHE BOOL "" FORCE)
diff --git a/clang/cmake/caches/hexagon-unknown-linux-musl-clang-dylib.cmake b/clang/cmake/caches/hexagon-unknown-linux-musl-clang-dylib.cmake
@@ -0,0 +1,7 @@
+set(LLVM_BUILD_LLVM_DYLIB ON CACHE BOOL "")
+set(LLVM_LINK_LLVM_DYLIB ON CACHE BOOL "")
+set(CLANG_LINK_LLVM_DYLIB ON CACHE BOOL "")
+
+# Clear version suffix to prevent versioned library names like libLLVM.so.22.1-rc1
+# which lld doesn't recognize. This results in libLLVM.so.22.1 instead.
+set(LLVM_VERSION_SUFFIX "" CACHE STRING "")
