From 7ed7b406edf1ddff02ae779f7f8636f2e5bd6025 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mos=C3=A8=20Giordano?= Date: Tue, 6 Aug 2024 10:46:41 +0200 Subject: [PATCH] [build] Some improvements to the LLVM build system (#55354) ### Elaboration of the issue After #55180 we implicitly require an LLVM built with Zlib support, but compiling Julia with `make USE_BINARYBUILDER_LLVM=0` builds an LLVM without Zlib support, despite the fact we attempt to request it at https://github.com/JuliaLang/julia/blob/996351f5f6651d1508aef3c35c7d37eb22a0fb1e/deps/llvm.mk#L97 This was first identified in #55337. ### Explanation of how configuration of LLVM failed `ZLIB_LIBRARY` must be the path to the zlib library, but we currently set it to the libdir where the library is installed (introduced in #42622): https://github.com/JuliaLang/julia/blob/996351f5f6651d1508aef3c35c7d37eb22a0fb1e/deps/llvm.mk#L97 which is wrong. However, CMake is actually able to find Zlib correctly, but then the check at https://github.com/llvm/llvm-project/blob/46425b8d0fac3c529aa4a716d19abd7032e452f3/llvm/cmake/config-ix.cmake#L139-L141 uses the value of `ZLIB_LIBRARY` to list the Zlib to link for the test, but being `ZLIB_LIBRARY` a directory, CMake doesn't see any valid Zlib and thus tries to run the test without linking any Zlib, and the test silently fails (they're silent only when `LLVM_ENABLE_ZLIB=ON`), resulting in no usable Zlib available, even if found. ### Proposed solution `ZLIB_ROOT` is the only [hint recommended by the CMake module `FindZLIB`](https://cmake.org/cmake/help/latest/module/FindZLIB.html#hints). This PR replaces a broken `ZLIB_LIBRARY` with an appropriate `ZLIB_ROOT`. Also, we set `LLVM_ENABLE_ZLIB=FORCE_ON` which is the only way to make CMake fail loudly if no usable Zlib is available, and avoid going on with a non-usable build. ### Other comments I confirm this fixes #55337 for me, it should likely address https://github.com/JuliaCI/julia-buildkite/issues/373 as well. Also, options `COMPILER_RT_ENABLE_IOS`, `COMPILER_RT_ENABLE_WATCHOS`, `COMPILER_RT_ENABLE_TVOS`, and `HAVE_HISTEDIT_H` don't exist anymore, and they are removed. --- deps/BOLT.mk | 2 +- deps/llvm.mk | 5 ++--- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/deps/BOLT.mk b/deps/BOLT.mk index 70c5d03c762ec..34391ab10f716 100644 --- a/deps/BOLT.mk +++ b/deps/BOLT.mk @@ -30,7 +30,7 @@ LLVM_LDFLAGS += $(LDFLAGS) LLVM_LDFLAGS += $(LLVM_LDFLAGS) LLVM_CMAKE += -DLLVM_TARGETS_TO_BUILD:STRING=host -DCMAKE_BUILD_TYPE=Release LLVM_CMAKE += -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_HOST_TRIPLE="$(or $(XC_HOST),$(BUILD_MACHINE))" -LLVM_CMAKE += -DLLVM_ENABLE_ZLIB=ON -DZLIB_LIBRARY="$(build_prefix)/lib" +LLVM_CMAKE += -DLLVM_ENABLE_ZLIB=FORCE_ON -DZLIB_ROOT="$(build_prefix)" LLVM_CMAKE += -DLLVM_BINDINGS_LIST="" -DLLVM_ENABLE_BINDINGS=OFF -DLLVM_INCLUDE_DOCS=Off -DLLVM_ENABLE_TERMINFO=Off -DHAVE_LIBEDIT=Off diff --git a/deps/llvm.mk b/deps/llvm.mk index eddf9b60e38c7..08aff443dcff8 100644 --- a/deps/llvm.mk +++ b/deps/llvm.mk @@ -94,16 +94,15 @@ LLVM_LDFLAGS += $(BOLT_LDFLAGS) LLVM_CMAKE += -DLLVM_TARGETS_TO_BUILD:STRING="$(LLVM_TARGETS)" -DCMAKE_BUILD_TYPE="$(LLVM_CMAKE_BUILDTYPE)" LLVM_CMAKE += -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD:STRING="$(LLVM_EXPERIMENTAL_TARGETS)" LLVM_CMAKE += -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_HOST_TRIPLE="$(or $(XC_HOST),$(BUILD_MACHINE))" -LLVM_CMAKE += -DLLVM_ENABLE_ZLIB=ON -DZLIB_LIBRARY="$(build_prefix)/lib" +LLVM_CMAKE += -DLLVM_ENABLE_ZLIB=FORCE_ON -DZLIB_ROOT="$(build_prefix)" LLVM_CMAKE += -DLLVM_ENABLE_ZSTD=OFF -LLVM_CMAKE += -DCOMPILER_RT_ENABLE_IOS=OFF -DCOMPILER_RT_ENABLE_WATCHOS=OFF -DCOMPILER_RT_ENABLE_TVOS=OFF ifeq ($(USE_POLLY_ACC),1) LLVM_CMAKE += -DPOLLY_ENABLE_GPGPU_CODEGEN=ON endif LLVM_CMAKE += -DLLVM_TOOLS_INSTALL_DIR=$(call rel_path,$(build_prefix),$(build_depsbindir)) LLVM_CMAKE += -DLLVM_UTILS_INSTALL_DIR=$(call rel_path,$(build_prefix),$(build_depsbindir)) LLVM_CMAKE += -DLLVM_INCLUDE_UTILS=ON -DLLVM_INSTALL_UTILS=ON -LLVM_CMAKE += -DLLVM_BINDINGS_LIST="" -DLLVM_ENABLE_BINDINGS=OFF -DLLVM_INCLUDE_DOCS=Off -DLLVM_ENABLE_TERMINFO=Off -DHAVE_HISTEDIT_H=Off -DHAVE_LIBEDIT=Off +LLVM_CMAKE += -DLLVM_BINDINGS_LIST="" -DLLVM_ENABLE_BINDINGS=OFF -DLLVM_INCLUDE_DOCS=Off -DLLVM_ENABLE_TERMINFO=Off -DHAVE_LIBEDIT=Off ifeq ($(LLVM_ASSERTIONS), 1) LLVM_CMAKE += -DLLVM_ENABLE_ASSERTIONS:BOOL=ON endif # LLVM_ASSERTIONS