add 23 conf for GCC 14 cross compilers

Some adjustments:
- c6x: disable var tracking to workaround an ICEland
- m68k: use newlib master to use recent fix needed for gcc14
- rv64: update version of libc/linux
- rv32: disable Ada

refs compiler-explorer/compiler-explorer#6406

Signed-off-by: Marc Poulhiès <[email protected]>

Dockerfile

@@ -59,21 +59,20 @@ RUN apt-get update -y -q && apt-get upgrade -y -q && apt-get upgrade -y -q && \
     curl "https://s3.amazonaws.com/compiler-explorer/opt/gcc-11.4.0.tar.xz" -o gcc11.tar.xz && \
     curl "https://s3.amazonaws.com/compiler-explorer/opt/gcc-12.3.0.tar.xz" -o gcc12.tar.xz && \
     curl "https://s3.amazonaws.com/compiler-explorer/opt/gcc-13.2.0.tar.xz" -o gcc13.tar.xz && \
-    curl "https://s3.amazonaws.com/compiler-explorer/opt/gcc-trunk-20240419.tar.xz" -o "gcc-snapshot.tar.xz" && \
+    curl "https://s3.amazonaws.com/compiler-explorer/opt/gcc-14.1.0.tar.xz" -o gcc14.tar.xz && \
     tar Jxf gcc11.tar.xz && \
     tar Jxf gcc12.tar.xz && \
     tar Jxf gcc13.tar.xz && \
-    tar Jxf gcc-snapshot.tar.xz && \
-    mv gcc-trunk-20240419 gcc-trunk && \
-    rm gcc11.tar.xz gcc12.tar.xz gcc13.tar.xz gcc-snapshot.tar.xz
+    tar Jxf gcc14.tar.xz && \
+    rm gcc11.tar.xz gcc12.tar.xz gcc13.tar.xz gcc14.tar.xz
 
 ## Need for host GCC version to be ~= latest cross GCC being built.
 ## This is at least needed for building cross-GNAT (Ada) as the GNAT runtime has no
 ## requirement on a minimal supported version (e.g. need GCC 12 to build any GNAT runtime).
 ## This is only true for cross compiler. Native compiler can use host's runtime
 ## and bootstrap everything.
-ENV PATH="/opt/compiler-explorer/gcc-13.2.0/bin:${PATH}"
-ENV LD_LIBRARY_PATH="/opt/compiler-explorer/gcc-13.2.0/lib64:${PATH}"
+ENV PATH="/opt/compiler-explorer/gcc-14.1.0/bin:${PATH}"
+ENV LD_LIBRARY_PATH="/opt/compiler-explorer/gcc-14.1.0/lib64:${PATH}"
 
 WORKDIR /opt