This is supported in this GCC fork. [1] It has been packaged in Nixpkgs
since 2019. [2]

Their change to `config.sub` [3] is similar, but also includes a `vc4`
-> `vc4-unknown-elf` shorthand; I don't see any reasons to add any new
legacy 1-component short-hands, so I just skipped that part.

[1]: https://github.com/itszor/vc4-toolchain

[2]: https://github.com/NixOS/nixpkgs/pull/72657

[3]: 
https://github.com/itszor/gcc-vc4/commit/91278afabe61808c0b02078c078e758d69f94aff

* config.sub (vc4-*): Recognize.
* testsuite/config-sub.data (vc4-unknown-none-elf): New entries.
---
 config.sub                | 1 +
 testsuite/config-sub.data | 1 +
 2 files changed, 2 insertions(+)

diff --git a/config.sub b/config.sub
index defe52c..b727399 100755
--- a/config.sub
+++ b/config.sub
@@ -1253,6 +1253,7 @@ case $cpu-$vendor in
                        | ubicom32 \
                        | v70 | v850 | v850e | v850e1 | v850es | v850e2 | 
v850e2v3 \
                        | vax \
+                       | vc4 \
                        | visium \
                        | w65 \
                        | wasm32 | wasm64 \
diff --git a/testsuite/config-sub.data b/testsuite/config-sub.data
index f36bea2..0cdaca6 100644
--- a/testsuite/config-sub.data
+++ b/testsuite/config-sub.data
@@ -854,6 +854,7 @@ v850e2v3-elf                                        
v850e2v3-unknown-elf
 v850es                                         v850es-unknown-none
 v850es-elf                                     v850es-unknown-elf
 vax                                            vax-dec-ultrix4.2
+vc4-unknown-none-elf                           vc4-unknown-none-elf
 vaxv                                           vax-dec-sysv
 visium                                         visium-unknown-none
 visium-elf                                     visium-unknown-elf
-- 
2.40.1


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