wllvm error: C compiler cannot create executables

Question

I'm trying to build the LLVM bitcode of libosip2-4.1.0 with wllvm. I exported the following variables:

export LLVM_COMPILER=/home/oren/GIT/LatestKlee/llvm/Release/bin/clang
export LLVM_COMPILER_PATH=/home/oren/GIT/LatestKlee/llvm/Release/bin/

Then created a dedicated build library, and ran configure from there:

CC=wllvm ../libosip2-4.1.0/configure

However, configure script complains that wllvm cannot create executables:

configure: error: C compiler cannot create executables

When I run it without CC=wllvm (usual compilation with gcc) everything works fine. What should I do? Thanks!

Answer 1

It turns out that:

export LLVM_COMPILER=clang (works fine)

But not with an absolute path:

export LLVM_COMPILER=/home/oren/GIT/LatestKlee/llvm/Release/bin/clang (doesn't work)

Here is my final script that works fine and builds an llvm bitcode for libosip2-4.1.0:

wget https://ftp.gnu.org/gnu/osip/libosip2-4.1.0.tar.gz
tar xf libosip2-4.1.0.tar.gz

mkdir build
cd build
CC=wllvm LLVM_COMPILER=clang ../libosip2-4.1.0/configure --enable-test --disable-shared
LLVM_COMPILER=clang make -j

cd ./src/test
extract-bc ./torture_test
file ./torture_test.bc

And the desired terminal output that proves mission accomplished:

./torture_test.bc: LLVM IR bitcode