[PATCH] D130820: [cmake] Add LoongArch to config.guess

[WÁNG Xuěruì via Phabricator via llvm-commits]

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Necessary for native builds on LoongArch. Only Linux is added for now,
matching upstream config.git changes.

Unfortunately, the upstream config.guess is GPLv3+ since 2012, and
LLVM is without autoconf support for a long time, so the script's
licensing exception no longer works and a bump could not be trivially
done.

This is the same as the upstream commit adding LoongArch <https://git.savannah.gnu.org/gitweb/?p=config.git;a=commitdiff;h=c8ddc8472f8efcadafc1ef53ca1d863415fddd5f>,
but rewritten to match the 2011 style that our script is holding on
to.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130820

Files:
  llvm/cmake/config.guess


Index: llvm/cmake/config.guess
===================================================================
--- llvm/cmake/config.guess
+++ llvm/cmake/config.guess
@@ -922,6 +922,9 @@
     ia64:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;
+    loongarch32:Linux:*:* | loongarch64:Linux:*:* | loongarchx32:Linux:*:*)
+	echo "${UNAME_MACHINE}-unknown-linux-${LIBC}"
+	exit ;;
     m32r*:Linux:*:*)
 	echo ${UNAME_MACHINE}-unknown-linux-gnu
 	exit ;;


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