Add Linux Relibc Target

[Jeremy Soller]

diff --git a/config.sub b/config.sub
index d80c5d7..35bc4bc 100755
--- a/config.sub
+++ b/config.sub
@@ -1697,7 +1697,7 @@ fi
 # Now, validate our (potentially fixed-up) OS.
 case $os in
        # Sometimes we do "kernel-libc", so those need to count as OSes.
-       musl* | newlib* | uclibc*)
+       musl* | newlib* | relibc* | uclibc*)
                ;;
        # Likewise for "kernel-abi"
        eabi* | gnueabi*)
@@ -1755,11 +1755,11 @@ esac
 # As a final step for OS-related things, validate the OS-kernel combination
 # (given a valid OS), if there is a kernel.
 case $kernel-$os in
-       linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib*
| linux-musl* | linux-uclibc* )
+       linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib*
| linux-musl* | linux-relibc* | linux-uclibc* )
                ;;
        uclinux-uclibc* )
                ;;
-       -dietlibc* | -newlib* | -musl* | -uclibc* )
+       -dietlibc* | -newlib* | -musl* | -relibc* | -uclibc* )
                # These are just libc implementations, not actual OSes, and thus
                # require a kernel.
                echo "Invalid configuration \`$1': libc \`$os' needs
explicit kernel." 1>&2
diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
index 8e68cee..4975288 100644
--- a/testsuite/config-sub.data
+++ b/testsuite/config-sub.data
@@ -827,6 +827,7 @@ x86_64-ericsson-dicos
 x86_64-ericsson-dicos
 x86_64-fuchsia                                 x86_64-pc-fuchsia
 x86_64-genode                                  x86_64-pc-genode
 x86_64-glidix                                  x86_64-pc-glidix
+x86_64-linux-relibc                            x86_64-pc-linux-relibc
 x86_64-nto                                     x86_64-pc-nto-qnx
 x86_64-os108                                   x86_64-pc-os108
 x86_64-pc-ptx                                  x86_64-pc-ptx