syscall-mips64el-def.diff: fix the call to undeclared function 'syscall'; on mips

debian/changelog

@@ -1,3 +1,10 @@
+llvm-toolchain-15 (1:15.0.0~+rc3-1~exp3) UNRELEASED; urgency=medium
+
+  * syscall-mips64el-def.diff: fix the call to undeclared function 'syscall';
+    on mips
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Fri, 02 Sep 2022 11:43:11 +0200
+
 llvm-toolchain-15 (1:15.0.0~+rc3-1~exp2) experimental; urgency=medium
 
   * Update of the build dep from llvm-spirv => llvm-spirv-14

debian/patches/mips/syscall-mips64el-def.diff

@@ -0,0 +1,16 @@
+Index: llvm-toolchain-15-15.0.0~+rc3/compiler-rt/lib/builtins/clear_cache.c
+===================================================================
+--- llvm-toolchain-15-15.0.0~+rc3.orig/compiler-rt/lib/builtins/clear_cache.c
++++ llvm-toolchain-15-15.0.0~+rc3/compiler-rt/lib/builtins/clear_cache.c
+@@ -6,6 +6,11 @@
+ //
+ //===----------------------------------------------------------------------===//
+ 
++#if defined(__linux__) && defined(__mips__)
++// Otherwise, the build fails as it cannot find syscall
++#define _GNU_SOURCE
++#endif
++
+ #include "int_lib.h"
+ #if defined(__linux__)
+ #include <assert.h>

debian/patches/series

@@ -77,6 +77,7 @@ libcxx/libcxx-silent-failure-arm64.diff
 mips/mips-fpxx-enable.diff
 mips/mips-force-nomadd4.patch
 mips/mips-D101773-reloc.patch
+mips/syscall-mips64el-def.diff
 
 26-set-correct-float-abi.diff
 clang-baseline-fix-i386.patch