Add support for riscv64

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

abe2e7de4d1f2d5861d7c9ab9c7e778f2ee1dcd2.patch

@@ -0,0 +1,37 @@
+From abe2e7de4d1f2d5861d7c9ab9c7e778f2ee1dcd2 Mon Sep 17 00:00:00 2001
+From: Andreas Schwab <schwab@suse.de>
+Date: Fri, 10 Apr 2020 15:34:52 +0200
+Subject: [PATCH] Don't require sub-word atomics
+
+On some architectures (like RISC-V) sub-word atomics are only available
+when linking against -latomic, but the configure script doesn't do that,
+causing the atomic checks to fail and the resulting ruby binary is
+non-functional.  Ruby does not use sub-word atomic operations, rb_atomic_t
+is defined to unsigned int, so use unsigned int when checking for atomic
+operations.
+---
+ configure.ac | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 7c12b9e5fb94..ba86deffbebb 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1498,7 +1498,7 @@ AS_IF([test "$GCC" = yes], [
+     ])
+ 
+     AC_CACHE_CHECK([for __atomic builtins], [rb_cv_gcc_atomic_builtins], [
+-	AC_TRY_LINK([unsigned char atomic_var;],
++	AC_TRY_LINK([unsigned int atomic_var;],
+ 		    [
+ 			__atomic_exchange_n(&atomic_var, 0, __ATOMIC_SEQ_CST);
+ 			__atomic_exchange_n(&atomic_var, 1, __ATOMIC_SEQ_CST);
+@@ -1513,7 +1513,7 @@ AS_IF([test "$GCC" = yes], [
+     ])
+ 
+     AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [
+-	AC_TRY_LINK([unsigned char atomic_var;],
++	AC_TRY_LINK([unsigned int atomic_var;],
+ 		    [
+ 			__sync_lock_test_and_set(&atomic_var, 0);
+ 			__sync_lock_test_and_set(&atomic_var, 1);

ruby-2.7.1-disable-riscv64-clocks.patch

@@ -0,0 +1,13 @@
+diff --git a/spec/ruby/core/process/fixtures/clocks.rb b/spec/ruby/core/process/fixtures/clocks.rb
+index 7537cfa..c4c647a 100644
+--- a/spec/ruby/core/process/fixtures/clocks.rb
++++ b/spec/ruby/core/process/fixtures/clocks.rb
+@@ -34,7 +34,7 @@ module ProcessSpecs
+     end
+ 
+     # These clocks in practice on ARM on Linux do not seem to match their reported resolution.
+-    platform_is :armv7, :armv8, :aarch64 do
++    platform_is :armv7, :armv8, :aarch64, :riscv64 do
+       clocks = clocks.reject { |clock, value|
+         [:CLOCK_PROCESS_CPUTIME_ID, :CLOCK_THREAD_CPUTIME_ID, :CLOCK_MONOTONIC_RAW].include?(clock)
+       }

ruby.spec

@@ -23,7 +23,7 @@
 
 
 %global release 135
-%{!?release_string:%define release_string %{?development_release:0.}%{release}%{?development_release:.%{development_release}}%{?dist}}
+%{!?release_string:%define release_string %{?development_release:0.}%{release}%{?development_release:.%{development_release}}.0.riscv64%{?dist}}
 
 # The RubyGems library has to stay out of Ruby directory tree, since the
 # RubyGems should be share by all Ruby implementations.
@@ -173,6 +173,14 @@ Patch19: ruby-2.7.1-Timeout-the-test_bug_reporter_add-witout-raising-err.patch
 # https://github.com/ruby/ruby/pull/3393
 Patch20: ruby-3.0.0-preview1-Enable-arm64-optimizations-that-exist-for-power-x86.patch
 
+# Disable pthread assert on Linux RISC-V (riscv64)
+Patch30: abe2e7de4d1f2d5861d7c9ab9c7e778f2ee1dcd2.patch
+
+# Same as for ARM.
+# See: https://bugs.ruby-lang.org/issues/16007
+#      https://github.com/ruby/ruby/commit/324dd9d01f0c97631a2588f63231bcb651844cca
+Patch31: ruby-2.7.1-disable-riscv64-clocks.patch
+
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 Suggests: rubypick
 Recommends: ruby(rubygems) >= %{rubygems_version}
@@ -589,6 +597,11 @@ rm -rf ext/fiddle/libffi*
 %patch19 -p1
 %patch20 -p1
 
+%ifarch riscv64
+%patch30 -p1
+%patch31 -p1
+%endif
+
 # Provide an example of usage of the tapset:
 cp -a %{SOURCE3} .
 
@@ -869,6 +882,10 @@ MSPECOPTS="$MSPECOPTS -P 'File.utime allows Time instances in the far future to
 # https://bugs.ruby-lang.org/issues/16749
 MSPECOPTS="$MSPECOPTS -P 'File.lchmod changes the file mode of the link and not of the file'"
 
+%ifarch riscv64
+%define test_timeout_scale 30
+%endif
+
 # Give an option to increase the timeout in tests.
 # https://bugs.ruby-lang.org/issues/16921
 %{?test_timeout_scale:RUBY_TEST_TIMEOUT_SCALE="%{test_timeout_scale}"} \
@@ -1285,6 +1302,9 @@ MSPECOPTS="$MSPECOPTS -P 'File.lchmod changes the file mode of the link and not
 
 
 %changelog
+* Mon Nov 30 2020 David Abdurachmanov <david.abdurachmanov@sifive.com> - 2.7.2-135.0.riscv64
+- Fix for riscv64
+
 * Tue Oct 13 2020 Vít Ondruch <vondruch@redhat.com> - 2.7.2-135
 - Upgrade to Ruby 2.7.2.