Only add the gmp dependency for ruby versions >= 2.1.0 (#506).

* GMP acceleration of `Bignum` was first added in Ruby 2.1.0.
  https://bugs.ruby-lang.org/issues/8796

Author: postmodern

share/ruby-install/ruby/dependencies.sh

@@ -10,7 +10,6 @@ case "$package_manager" in
 			libssl-dev
 			libncurses-dev
 			libffi-dev
-			libgmp-dev
 		)
 		;;
 	dnf|yum)
@@ -23,7 +22,6 @@ case "$package_manager" in
 			openssl-devel
 			ncurses-devel
 			libffi-devel
-			gmp-devel
 		)
 		;;
 	pacman)
@@ -36,7 +34,6 @@ case "$package_manager" in
 			openssl
 			libyaml
 			libffi
-			gmp
 		)
 		;;
 	zypper)
@@ -50,7 +47,6 @@ case "$package_manager" in
 			libopenssl-devel
 			ncurses-devel
 			libffi-devel
-			gmp-devel
 		)
 		;;
 	brew|port)
@@ -59,15 +55,13 @@ case "$package_manager" in
 			automake
 			libyaml
 			libffi
-			gmp
 		)
 		;;
 	pkg)
 		ruby_dependencies=(
 			openssl
 			libyaml
 			libffi
-			gmp
 		)
 		;;
 	xbps)
@@ -78,11 +72,21 @@ case "$package_manager" in
 			libyaml-devel
 			ncurses-devel
 			libffi-devel
-			gmp-devel
 		)
 		;;
 esac
 
+#
+# Add the gmp library for ruby >= 2.1.0 to accelrate the Bignum class.
+#
+if [[ "$ruby_version" > "2.1.0" ]] || [[ "$ruby_version" == "2.1.0" ]]; then
+	case "$package_manager" in
+		apt)			ruby_dependencies+=(libgmp-dev) ;;
+		dnf|yum|zypper|xbps)	ruby_dependencies+=(gmp-devel) ;;
+		brew|port|pacman|pkg)	ruby_dependencies+=(gmp) ;;
+	esac
+fi
+
 #
 # Add bison and readline as a dependencies for ruby < 3.3.0.
 #

test/ruby-tests/dependencies_test.sh

@@ -128,6 +128,104 @@ function test_when_package_manager_is_xbps()
 	package_manager="$original_package_manager"
 }
 
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_apt()
+{
+	local original_package_manager="$package_manager"
+	package_manager="apt"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit libgmp-dev from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *libgmp-dev" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_dnf()
+{
+	local original_package_manager="$package_manager"
+	package_manager="dnf"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp-devel from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp-devel" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_yum()
+{
+	local original_package_manager="$package_manager"
+	package_manager="yum"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp-devel from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp-devel" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_pacman()
+{
+	local original_package_manager="$package_manager"
+	package_manager="pacman"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_zypper()
+{
+	local original_package_manager="$package_manager"
+	package_manager="zypper"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp-devel from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp-devel" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_pkg()
+{
+	local original_package_manager="$package_manager"
+	package_manager="pkg"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp" ]]'
+
+	package_manager="$original_package_manager"
+}
+
+function test_ruby_version_is_less_than_2_1_0_and_when_package_manager_is_xbps()
+{
+	local original_package_manager="$package_manager"
+	package_manager="xbps"
+	ruby_version="2.0.0"
+
+	source "$ruby_install_dir/$ruby/dependencies.sh"
+
+	assertFalse "did not omit gmp-devel from \$ruby_dependencies" \
+	            '[[ "${ruby_dependencies[*]}" == *gmp-devel" ]]'
+
+	package_manager="$original_package_manager"
+}
+
 function test_when_ruby_version_is_less_than_3_3_0_and_package_manager_is_apt()
 {
 	local original_package_manager="$package_manager"