make exported symbol files platform specific (#31970)

src/ruby/ext/grpc/ext-export-truffleruby-with-ruby-abi-version.clang

@@ -0,0 +1,2 @@
+_Init_grpc_c
+_rb_tr_abi_version

src/ruby/ext/grpc/ext-export-truffleruby-with-ruby-abi-version.gcc

@@ -0,0 +1,7 @@
+grpc_1.0 { 
+  global: 
+    Init_grpc_c;
+    rb_tr_abi_version;
+  local: 
+    *;
+};

src/ruby/ext/grpc/ext-export-truffleruby.clang

@@ -1,2 +1 @@
 _Init_grpc_c
-_rb_tr_abi_version

src/ruby/ext/grpc/ext-export-truffleruby.gcc

@@ -1,7 +1,6 @@
 grpc_1.0 { 
   global: 
     Init_grpc_c;
-    rb_tr_abi_version;
   local: 
     *;
-};
+};

src/ruby/ext/grpc/ext-export-with-ruby-abi-version.clang

@@ -0,0 +1,2 @@
+_Init_grpc_c
+_ruby_abi_version

src/ruby/ext/grpc/ext-export-with-ruby-abi-version.gcc

@@ -0,0 +1,7 @@
+grpc_1.0 { 
+  global: 
+    Init_grpc_c;
+    ruby_abi_version;
+  local: 
+    *;
+};

src/ruby/ext/grpc/ext-export.clang

@@ -1,2 +1 @@
 _Init_grpc_c
-_ruby_abi_version

src/ruby/ext/grpc/ext-export.gcc

@@ -1,7 +1,6 @@
 grpc_1.0 { 
   global: 
     Init_grpc_c;
-    ruby_abi_version;
   local: 
     *;
-};
+};

src/ruby/ext/grpc/extconf.rb

@@ -113,8 +113,30 @@ end
 $CFLAGS << ' -DGRPC_RUBY_WINDOWS_UCRT' if windows_ucrt
 $CFLAGS << ' -I' + File.join(grpc_root, 'include')
 
-ext_export_file = File.join(grpc_root, 'src', 'ruby', 'ext', 'grpc', 'ext-export')
-ext_export_file += '-truffleruby' if RUBY_ENGINE == 'truffleruby'
+def have_ruby_abi_version()
+  m = /(\d+)\.(\d+)/.match(RUBY_VERSION)
+  if m.nil?
+    puts "Failed to parse ruby version: #{RUBY_VERSION}. Assuming ruby_abi_version symbol is NOT present."
+    return false
+  end
+  major = m[1].to_i
+  minor = m[2].to_i
+  if major >= 3 and minor >= 2
+    puts "Ruby version #{RUBY_VERSION} >= 3.2. Assuming ruby_abi_version symbol is present."
+    return true
+  end
+  puts "Ruby version #{RUBY_VERSION} < 3.2. Assuming ruby_abi_version symbol is NOT present."
+  false
+end
+
+def ext_export_filename()
+  name = 'ext-export'
+  name += '-truffleruby' if RUBY_ENGINE == 'truffleruby'
+  name += '-with-ruby-abi-version' if have_ruby_abi_version()
+  name
+end
+
+ext_export_file = File.join(grpc_root, 'src', 'ruby', 'ext', 'grpc', ext_export_filename())
 $LDFLAGS << ' -Wl,--version-script="' + ext_export_file + '.gcc"' if linux
 $LDFLAGS << ' -Wl,-exported_symbols_list,"' + ext_export_file + '.clang"' if apple_toolchain