Build error: undefined symbol: gcc_jit_context_get_target_builtin_function

Hi,

I have been trying following the instructions to build rustc_codegen_gcc with the README instructions and got the following error.

./build.sh --release
...
[BUILD] sysroot
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names -Cpanic=abort -Csymbol-mangling-ver
sion=v0 -Cdebuginfo=2 -Clto=off -Zpanic-abort-tests -Zcodegen-backend=/home/lukyxu/repos/rust/rustc_codegen_gcc/targ
et/release/librustc_codegen_gcc.so --sysroot /home/lukyxu/repos/rust/rustc_codegen_gcc/build_sysroot/sysroot -Z forc
e-unstable-if-unmarked -Cpanic=abort --target x86_64-unknown-linux-gnu --crate-type bin --crate-type rlib --crate-ty
pe dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit statu
s: 1)
  --- stderr
  error: couldn't load codegen backend "/home/lukyxu/repos/rust/rustc_codegen_gcc/target/release/librustc_codegen_gc
c.so": /home/lukyxu/repos/rust/rustc_codegen_gcc/target/release/librustc_codegen_gcc.so: undefined symbol: gcc_jit_c
ontext_get_target_builtin_function

Start with the README build instructions and the failing ./build.sh --release command. Investigate why the built librustc_codegen_gcc.so cannot resolve gcc_jit_context_get_target_builtin_function, then rerun the build and sysroot compilation; done means rustc loads the backend without the undefined-symbol error.