libgccjit testsuite seems to fail due to compile errors in libgccjit++.h

Sorry if this is not the right place to put this issue, I'm not sure where is the best place to file issues against the custom GCC.

ENV Info:

• I am running Gentoo Linux on aarch64, emulated inside QEMU, although I assume this bug appears as well on x86_64
• My host toolchain is running g++ 13.2.1

I downloaded, built, and run gcc as described in the README, with --enable-languages=jit,c++

After building libgccjit, I wanted to run the tests, but observed that all the tests failed:

PASS: ../jit/docs/examples/tut01-hello-world.c (test for excess errors)
Executing on host: /home/liam/rustc_gcc/gcc-build/gcc/testsuite/jit/../../xg++ -B/home/liam/rustc_gcc/gcc-build/gcc/testsuite/jit/../../  /home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/docs/examples/tut01-hello-world.cc    -fdiagnostics-plain-output  -nostdinc++ -I/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/libstdc++-v3/include/aarch64-unknown-linux-gnu -I/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/libstdc++-v3/include -I/home/liam/rustc_gcc/gcc/libstdc++-v3/libsupc++ -I/home/liam/rustc_gcc/gcc/libstdc++-v3/include/backward -I/home/liam/rustc_gcc/gcc/libstdc++-v3/testsuite/util -fmessage-length=0  -I/home/liam/rustc_gcc/gcc/gcc/testsuite/../jit -lgccjit -g -Wall -Werror -rdynamic    -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs  -B/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs  -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs  -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/experimental/.libs -B/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libitm/ -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libitm/.libs -lm  -o tut01-hello-world.cc.exe    (timeout = 300)
spawn -ignore SIGHUP /home/liam/rustc_gcc/gcc-build/gcc/testsuite/jit/../../xg++ -B/home/liam/rustc_gcc/gcc-build/gcc/testsuite/jit/../../ /home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/docs/examples/tut01-hello-world.cc -fdiagnostics-plain-output -nostdinc++ -I/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/libstdc++-v3/include/aarch64-unknown-linux-gnu -I/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/libstdc++-v3/include -I/home/liam/rustc_gcc/gcc/libstdc++-v3/libsupc++ -I/home/liam/rustc_gcc/gcc/libstdc++-v3/include/backward -I/home/liam/rustc_gcc/gcc/libstdc++-v3/testsuite/util -fmessage-length=0 -I/home/liam/rustc_gcc/gcc/gcc/testsuite/../jit -lgccjit -g -Wall -Werror -rdynamic -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs -B/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/.libs -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libstdc++-v3/src/experimental/.libs -B/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libitm/ -L/home/liam/rustc_gcc/gcc-build/aarch64-unknown-linux-gnu/./libitm/.libs -lm -o tut01-hello-world.cc.exe^M
In file included from /home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/docs/examples/tut01-hello-world.cc:20:^M
/home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/libgccjit++.h:1772:1: error: no declaration matches 'void gccjit::rvalue::set_type(gccjit::type*)'^M
/home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/libgccjit++.h:1772:1: note: no functions named 'void gccjit::rvalue::set_type(gccjit::type*)'^M
/home/liam/rustc_gcc/gcc/gcc/testsuite/../jit/libgccjit++.h:480:9: note: 'class gccjit::rvalue' defined here^M
compiler exited with status 1
FAIL: ../jit/docs/examples/tut01-hello-world.cc, initial compilation

I was able to create a patch that gets this test (and all the others failing for the same reason) working:

diff --git a/gcc/jit/libgccjit++.h b/gcc/jit/libgccjit++.h
index f3ee65cccd7..5fe00e95cb2 100644
--- a/gcc/jit/libgccjit++.h
+++ b/gcc/jit/libgccjit++.h
@@ -485,6 +485,7 @@ namespace gccjit
     gcc_jit_rvalue *get_inner_rvalue () const;

     type get_type ();
+    void set_type (type *new_type);

     rvalue access_field (field field,
                         location loc = location ());
@@ -1771,7 +1772,7 @@ rvalue::get_type ()
 inline void
 rvalue::set_type (type *new_type)
 {
-  gcc_jit_rvalue_set_type (get_inner_rvalue (), new_type);
+  gcc_jit_rvalue_set_type (get_inner_rvalue (), new_type->get_inner_type ());
 }

It seems this error was caused by https://github.com/rust-lang/gcc/commit/341be3b7d7ac6976cfed8ed59da3573c040d0776#diff-70af12ffc4a575792e96588dc518ccf7aacf05f74dfe08d7b931275015c030fe

Start with gcc/jit/libgccjit++.h, comparing the gccjit::rvalue declaration and definition of set_type with the libgccjit API. Run the libgccjit testsuite, including jit/docs/examples/tut01-hello-world.cc, and confirm the examples compile without the reported declaration or type errors.