File _service:obs_scm:9002-fix-riscv64-build.patch of Package ceph

diff --git a/src/arrow/cpp/cmake_modules/SetupCxxFlags.cmake b/src/arrow/cpp/cmake_modules/SetupCxxFlags.cmake
index c1a1ba0..84f224b 100644
--- a/src/arrow/cpp/cmake_modules/SetupCxxFlags.cmake
+++ b/src/arrow/cpp/cmake_modules/SetupCxxFlags.cmake
@@ -32,6 +32,8 @@ if(NOT DEFINED ARROW_CPU_FLAG)
     set(ARROW_CPU_FLAG "ppc")
   elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
     set(ARROW_CPU_FLAG "s390x")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64")
+    set(ARROW_CPU_FLAG "riscv64")
   else()
     set(ARROW_CPU_FLAG "x86")
   endif()
diff --git a/src/arrow/cpp/src/arrow/vendored/fast_float/float_common.h b/src/arrow/cpp/src/arrow/vendored/fast_float/float_common.h
index f7b7662..c1fe08d 100644
--- a/src/arrow/cpp/src/arrow/vendored/fast_float/float_common.h
+++ b/src/arrow/cpp/src/arrow/vendored/fast_float/float_common.h
@@ -10,7 +10,7 @@
        || defined(__MINGW64__)                                          \
        || defined(__s390x__)                                            \
        || (defined(__ppc64__) || defined(__PPC64__) || defined(__ppc64le__) || defined(__PPC64LE__)) \
-       || defined(__EMSCRIPTEN__))
+       || defined(__EMSCRIPTEN__) || defined(__riscv))
 #define FASTFLOAT_64BIT
 #elif (defined(__i386) || defined(__i386__) || defined(_M_IX86)   \
      || defined(__arm__)                                        \
diff --git a/src/common/Cycles.h b/src/common/Cycles.h
index b546479..14bc6bf 100644
--- a/src/common/Cycles.h
+++ b/src/common/Cycles.h
@@ -84,6 +84,10 @@ class Cycles {
     uint64_t tsc;
     asm volatile("stck %0" : "=Q" (tsc) : : "cc");
     return tsc;
+#elif defined(__riscv) && __riscv_xlen == 64
+    uint64_t tsc;
+    asm volatile ("rdtime %0" : "=r" (tsc));
+    return tsc;
 #else
 #warning No high-precision counter available for your OS/arch
     return 0;