Bring back riscv64-redhat-linux triplet

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

0001-Bring-back-riscv64-redhat-linux-triplet.patch

@@ -0,0 +1,27 @@
+From 2dcf8703706e0a5b7b45991e5cd10dd38f1d8c4b Mon Sep 17 00:00:00 2001
+From: David Abdurachmanov <davidlt@rivosinc.com>
+Date: Thu, 24 Nov 2022 06:26:46 +0200
+Subject: [PATCH] Bring back riscv64-redhat-linux triplet
+
+Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>
+---
+ lib/Driver/ToolChains/Gnu.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/lib/Driver/ToolChains/Gnu.cpp b/lib/Driver/ToolChains/Gnu.cpp
+index e955835b..e5c17544 100644
+--- a/lib/Driver/ToolChains/Gnu.cpp
++++ b/lib/Driver/ToolChains/Gnu.cpp
+@@ -2302,7 +2302,8 @@ void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
+   static const char *const RISCV64LibDirs[] = {"/lib64", "/lib"};
+   static const char *const RISCV64Triples[] = {"riscv64-unknown-linux-gnu",
+                                                "riscv64-linux-gnu",
+-                                               "riscv64-unknown-elf"};
++                                               "riscv64-unknown-elf",
++                                               "riscv64-redhat-linux"};
+ 
+   static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
+   static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
+-- 
+2.37.1
+

clang.spec

@@ -70,6 +70,8 @@ Patch5:     0010-PATCH-clang-Produce-DWARF4-by-default.patch
 # TODO: Can be dropped in LLVM 16: https://reviews.llvm.org/D133316
 Patch6:     0001-Mark-fopenmp-implicit-rpath-as-NoArgumentUnused.patch
 
+Patch10:    0001-Bring-back-riscv64-redhat-linux-triplet.patch
+
 %if %{without compat_build}
 # Patches for clang-tools-extra
 # See https://reviews.llvm.org/D120301
@@ -598,6 +600,7 @@ false
 * Thu Nov 24 2022 David Abdurachmanov <davidlt@rivosinc.com> - 15.0.4-1.0.riscv64
 - Ignore test suite failures on riscv64 for now
 - Prepare for riscv64
+- Add riscv64-redhat-linux triplet
 
 * Tue Nov 08 2022 Nikita Popov <npopov@redhat.com> - 15.0.4-1
 - Update to LLVM 15.0.4