Remove template for extconf.rb and get the version from lib/grpc/version.rb (#30017)

* Having the entire logic of extconf.rb duplicated in 2 files is
  extremely inconvenient, also because the Ruby logic in the YAML template
  does not get any syntax highlighting or IDE features.

src/ruby/ext/grpc/extconf.rb

@@ -60,7 +60,9 @@ end
 
 ENV['CPPFLAGS'] = '-DGPR_BACKWARDS_COMPATIBILITY_MODE'
 ENV['CPPFLAGS'] += ' -DGRPC_XDS_USER_AGENT_NAME_SUFFIX="\"RUBY\"" '
-ENV['CPPFLAGS'] += ' -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX="\"1.48.0.dev\"" '
+
+require_relative '../../lib/grpc/version'
+ENV['CPPFLAGS'] += ' -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX="\"' + GRPC::VERSION + '\"" '
 
 output_dir = File.expand_path(RbConfig::CONFIG['topdir'])
 grpc_lib_dir = File.join(output_dir, 'libs', grpc_config)

templates/src/ruby/ext/grpc/extconf.rb.template

@@ -1,132 +0,0 @@
-%YAML 1.2
---- |
-  # Copyright 2015 gRPC authors.
-  #
-  # Licensed under the Apache License, Version 2.0 (the "License");
-  # you may not use this file except in compliance with the License.
-  # You may obtain a copy of the License at
-  #
-  #     http://www.apache.org/licenses/LICENSE-2.0
-  #
-  # Unless required by applicable law or agreed to in writing, software
-  # distributed under the License is distributed on an "AS IS" BASIS,
-  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  # See the License for the specific language governing permissions and
-  # limitations under the License.
-  
-  require 'etc'
-  require 'mkmf'
-  
-  windows = RUBY_PLATFORM =~ /mingw|mswin/
-  bsd = RUBY_PLATFORM =~ /bsd/
-  darwin = RUBY_PLATFORM =~ /darwin/
-  linux = RUBY_PLATFORM =~ /linux/
-  cross_compiling = ENV['RCD_HOST_RUBY_VERSION'] # set by rake-compiler-dock in build containers
-  
-  grpc_root = File.expand_path(File.join(File.dirname(__FILE__), '../../../..'))
-  
-  grpc_config = ENV['GRPC_CONFIG'] || 'opt'
-  
-  ENV['MACOSX_DEPLOYMENT_TARGET'] = '10.10'
-  
-  if ENV['AR'].nil? || ENV['AR'].size == 0
-      ENV['AR'] = RbConfig::CONFIG['AR']
-  end
-  if ENV['CC'].nil? || ENV['CC'].size == 0
-      ENV['CC'] = RbConfig::CONFIG['CC']
-  end
-  if ENV['CXX'].nil? || ENV['CXX'].size == 0
-      ENV['CXX'] = RbConfig::CONFIG['CXX']
-  end
-  if ENV['LD'].nil? || ENV['LD'].size == 0
-      ENV['LD'] = ENV['CC']
-  end
-  
-  if darwin && !cross_compiling
-    ENV['AR'] = 'libtool'
-    ENV['ARFLAGS'] = '-o'
-  end
-  
-  ENV['EMBED_OPENSSL'] = 'true'
-  ENV['EMBED_ZLIB'] = 'true'
-  ENV['EMBED_CARES'] = 'true'
-  
-  ENV['ARCH_FLAGS'] = RbConfig::CONFIG['ARCH_FLAG']
-  if darwin && !cross_compiling
-    if RUBY_PLATFORM =~ /arm64/
-      ENV['ARCH_FLAGS'] = '-arch arm64'
-    else
-      ENV['ARCH_FLAGS'] = '-arch i386 -arch x86_64'
-    end
-  end
-  
-  ENV['CPPFLAGS'] = '-DGPR_BACKWARDS_COMPATIBILITY_MODE'
-  ENV['CPPFLAGS'] += ' -DGRPC_XDS_USER_AGENT_NAME_SUFFIX="\"RUBY\"" '
-  ENV['CPPFLAGS'] += ' -DGRPC_XDS_USER_AGENT_VERSION_SUFFIX="\"${settings.ruby_version.ruby()}\"" '
-  
-  output_dir = File.expand_path(RbConfig::CONFIG['topdir'])
-  grpc_lib_dir = File.join(output_dir, 'libs', grpc_config)
-  ENV['BUILDDIR'] = output_dir
-  
-  unless windows
-    puts 'Building internal gRPC into ' + grpc_lib_dir
-    nproc = 4
-    nproc = Etc.nprocessors if Etc.respond_to? :nprocessors
-    nproc_override = ENV['GRPC_RUBY_BUILD_PROCS']
-    unless nproc_override.nil? or nproc_override.size == 0
-      nproc = nproc_override
-      puts "Overriding make parallelism to #{nproc}"
-    end
-    make = bsd ? 'gmake' : 'make'
-    cmd = "#{make} -j#{nproc} -C #{grpc_root} #{grpc_lib_dir}/libgrpc.a CONFIG=#{grpc_config} Q="
-    puts "Building grpc native library: #{cmd}"
-    system(cmd)
-    exit 1 unless $? == 0
-  end
-  
-  $CFLAGS << ' -I' + File.join(grpc_root, 'include')
-  
-  ext_export_file = File.join(grpc_root, 'src', 'ruby', 'ext', 'grpc', 'ext-export')
-  $LDFLAGS << ' -Wl,--version-script="' + ext_export_file + '.gcc"' if linux
-  $LDFLAGS << ' -Wl,-exported_symbols_list,"' + ext_export_file + '.clang"' if darwin
-  
-  $LDFLAGS << ' ' + File.join(grpc_lib_dir, 'libgrpc.a') unless windows
-  if grpc_config == 'gcov'
-    $CFLAGS << ' -O0 -fprofile-arcs -ftest-coverage'
-    $LDFLAGS << ' -fprofile-arcs -ftest-coverage -rdynamic'
-  end
-  
-  if grpc_config == 'dbg'
-    $CFLAGS << ' -O0 -ggdb3'
-  end
-  
-  $LDFLAGS << ' -Wl,-wrap,memcpy' if linux
-  $LDFLAGS << ' -static-libgcc -static-libstdc++' if linux
-  $LDFLAGS << ' -static' if windows
-  
-  $CFLAGS << ' -std=c11 '
-  $CFLAGS << ' -Wall '
-  $CFLAGS << ' -Wextra '
-  $CFLAGS << ' -pedantic '
-  
-  output = File.join('grpc', 'grpc_c')
-  puts 'Generating Makefile for ' + output
-  create_makefile(output)
-  
-  strip_tool = RbConfig::CONFIG['STRIP']
-  strip_tool += ' -x' if darwin
-  
-  if grpc_config == 'opt'
-    File.open('Makefile.new', 'w') do |o|
-      o.puts 'hijack: all strip'
-      o.puts
-      File.foreach('Makefile') do |i|
-        o.puts i
-      end
-      o.puts
-      o.puts 'strip: $(DLLIB)'
-      o.puts "\t$(ECHO) Stripping $(DLLIB)"
-      o.puts "\t$(Q) #{strip_tool} $(DLLIB)"
-    end
-    File.rename('Makefile.new', 'Makefile')
-  end