[cfe-dev] setting LLVM_TARGETS_TO_BUILD breaks when building clang shared library

[Jerry Scharf via cfe-dev]

Hi,

I am 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.
Is this something I am doing wrong or is there a build bug?

cmake command for llvm:

LD_LIBRARY_PATH="/usr/local/compilers/gcc9/lib64" cmake -G "Unix 
Makefiles" -DCMAKE_BUILD_TYPE=Relea
se -DCMAKE_C_COMPILER=/usr/local/compilers/gcc9/bin/gcc 
-DCMAKE_CXX_COMPILER=/usr/local/compilers/gc
c9/bin/g++ -DCMAKE_INSTALL_PREFIX=/usr/local/compilers/clang8 
-DLLVM_TARGETS_TO_BUILD="all" -DLLVM_B
UILD_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" -D
CMAKE_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_DY
LIB=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

thanks,

jerry


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