merge revision(s) d71be72: [Backport #20873]

	[Bug #20873] Consider `-FIXNUM_MIN` overflow

	`-FIXNUM_MIN` is usually greater than `FIXNUM_MAX` on platforms using
	two's complement representation.

Author: k0kubun

sprintf.c

@@ -811,7 +811,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
                 if (FIXNUM_P(num)) {
                     if ((SIGNED_VALUE)num < 0) {
                         long n = -FIX2LONG(num);
-                        num = LONG2FIX(n);
+                        num = LONG2NUM(n);
                         sign = -1;
                     }
                 }

test/ruby/test_sprintf.rb

@@ -227,6 +227,10 @@ def test_rational
 
     bug11766 = '[ruby-core:71806] [Bug #11766]'
     assert_equal("x"*10+"     1.0", sprintf("x"*10+"%8.1f", 1r), bug11766)
+
+    require 'rbconfig/sizeof'
+    fmin, fmax = RbConfig::LIMITS.values_at("FIXNUM_MIN", "FIXNUM_MAX")
+    assert_match(/\A-\d+\.\d+\z/, sprintf("%f", Rational(fmin, fmax)))
   end
 
   def test_rational_precision

version.h

@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 6
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 110
+#define RUBY_PATCHLEVEL 111
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"