LLVM linking problem with incoming

[martindemello]

configure:

configure: writing configuration
configure: 
configure: CFG_SRC_DIR          := /home/martin/opt/rust/ 
configure: CFG_BUILD_DIR        := /home/martin/opt/rust/ 
configure: CFG_OSTYPE           := unknown-linux-gnu 
configure: CFG_CPUTYPE          := i686 
configure: CFG_CONFIGURE_ARGS   :=  
configure: CFG_PREFIX           := /usr/local 
configure: CFG_TARGET_TRIPLES   := i686-unknown-linux-gnu 
configure: CFG_C_COMPILER       := gcc 
configure: CFG_LIBDIR           := lib 
configure: CFG_DISABLE_MANAGE_SUBMODULES :=  
configure: CFG_PANDOC           :=  
configure: CFG_LLVM_ROOT        :=  
configure: CFG_LLVM_SRC_DIR     := /home/martin/opt/rust/src/llvm/ 
configure: CFG_LLVM_BUILD_DIR_i686_unknown_linux_gnu := /home/martin/opt/rust/llvm/i686-unk ...
configure: CFG_LLVM_INST_DIR_i686_unknown_linux_gnu := /home/martin/opt/rust/llvm/i686-unk ...
configure: 
configure: leaving ./Makefile unchanged
configure: leaving config.mk unchanged
configure: 
configure: complete

make:

compile_and_link: i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/bin/rustc
error: linking with `cc` failed with code 1
note: cc arguments: -L/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -m32 -o i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/bin/rustc i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/bin/rustc.o -L/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -lcore-c3ca5d77d81b46c1-0.6 -L/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -lstd-4782a756585a81-0.6 -L/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -lsyntax-84efebcb12c867a2-0.6 -L/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -lrustc-c84825241471686d-0.6 -lrustrt -lrt -ldl -lm -lmorestack -Wl,-rpath,$ORIGIN/../lib -Wl,-rpath,/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib -Wl,-rpath,/usr/local/lib/rustc/i686-unknown-linux-gnu/lib
note: /home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMAddLoopUnrollPass'
/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMStructCreateNamed'

...

/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMMDStringInContext'
/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMConstIntGetZExtValue'
/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMAddInstructionCombiningPass'
/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMGetSectionSize'
/home/martin/opt/rust/i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMBuildExtractElement'
collect2: error: ld returned 1 exit status

error: aborting due to previous error
make: *** [i686-unknown-linux-gnu/stage0/lib/rustc/i686-unknown-linux-gnu/bin/rustc] Error 101

[martindemello]

the problem appears to be this:

configure: CFG_LLVM_CONFIG      := /usr/bin/llvm-config (3.2)

it's picking up my system llvm. tested by uninstalling llvm, after which everything compiled perfectly.

[brson]

It looks to me like CFG_LLVM_CONFIG is not used anywhere, so I opened an issue to remove it: #4657. I suspect this is not the problem.

Most of the variables for LLVM are set up here: https://github.com/mozilla/rust/blob/incoming/Makefile.in#L247
And those are based on two variables set up in the configure script: https://github.com/mozilla/rust/blob/incoming/configure#L806

I imagine that the step that went wrong here is linking rustllvm, which links statically to LLVM and is used in turn by librustc. You might want to run make VERBOSE=1 to get the output of the command to link rustllvm.

[mcpherrinm]

I ran into this, and a "make llvm-clean; make" fixed it.

[pcwalton]

Closing.

[donpdonp]

I'm running into this on 0.6, building from a directory that was used to build 0.5.

Error:note: /home/donp/src/rust/github/x86_64-unknown-linux-gnu/stage0/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc-c84825241471686d-0.6.so: undefined reference to `LLVMAddLoopUnrollPass'

trying to clean out llvm with mcpherrinm's comment gives
make: *** No rule to make target `llvm-clean'. Stop.

[mcpherrinm]

Typo on my part. It's "make clean-llvm"