[llvm-bugs] [Bug 43009] New: build of clang with LLVM_TARGETS_TO_BUILD set to X86 breaks when building clang shared library

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43009

            Bug ID: 43009
           Summary: build of clang with LLVM_TARGETS_TO_BUILD set to X86
                    breaks when building clang shared library
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Tooling
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jscharf at purestorage.com
                CC: llvm-bugs at lists.llvm.org

I was building clang 8.0.1 from source and tried using
-DLLVM_TARGETS_TO_BUILD="X86" as part of the cmake input along with shared
libraries. LLVM builds fine, the clang executable builds fine but the clang .so
fails, saying all the other arch entry points are missing. As soon as I change
X86 to all for both llvm and clang, it works fine. I am bootstrapping with
gcc9/ld first in this case.

cmake command for llvm:
 LD_LIBRARY_PATH="/usr/local/compilers/gcc9/lib64" cmake -G "Unix Makefiles"
-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/local/compilers/gcc9/bin/gcc
-DCMAKE_CXX_COMPILER=/usr/local/compilers/gcc9/bin/g++
-DCMAKE_INSTALL_PREFIX=/usr/local/compilers/clang8
-DLLVM_TARGETS_TO_BUILD="all" -DLLVM_BUILD_LLVM_DYLIB=true
-DLLVM_LINK_LLVM_DYLIB=true ../../llvm-8.0.1.src

clang:

LD_LIBRARY_PATH="/usr/local/compilers/gcc9/lib64" cmake -G "Unix Makefiles"
-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/local/compilers/gcc9/bin/gcc
-DCMAKE_CXX_COMPILER=/usr/local/compilers/gcc9/bin/g++
-DCMAKE_INSTALL_PREFIX=/usr/local/compilers/clang8
-DLLVM_TARGETS_TO_BUILD="all" -DLLVM_BUILD_LLVM_DYLIB=true
-DLLVM_LINK_LLVM_DYLIB=true -DCMAKE_C_FLAGS="-L/usr/local/compilers/c
lang8/lib" -DCMAKE_CXX_FLAGS="-L/usr/local/compilers/clang8/lib"
../../cfe-8.0.1.src

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