codegen: Add support for feature test macros

This adds new CCode string attribute 'feature_test_macro = "VALUE"'. Such
values will be added before the headers section as '#define VALUE'.

https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html

https://bugzilla.gnome.org/show_bug.cgi?id=793444

1 files changed, 11 insertions, 0 deletions

diff --git a/ccode/valaccodefile.vala b/ccode/valaccodefile.vala
index 128cd3938..aa5be219e 100644
--- a/ccode/valaccodefile.vala
+++ b/ccode/valaccodefile.vala
@@ -24,9 +24,11 @@
 public class Vala.CCodeFile {
 	public bool is_header { get; set; }
 
+	Set<string> features = new HashSet<string> (str_hash, str_equal);
 	Set<string> declarations = new HashSet<string> (str_hash, str_equal);
 	Set<string> includes = new HashSet<string> (str_hash, str_equal);
 	CCodeFragment comments = new CCodeFragment ();
+	CCodeFragment feature_test_macros = new CCodeFragment ();
 	CCodeFragment include_directives = new CCodeFragment ();
 	CCodeFragment type_declaration = new CCodeFragment ();
 	CCodeFragment type_definition = new CCodeFragment ();
@@ -46,6 +48,13 @@ public class Vala.CCodeFile {
 		comments.append (comment);
 	}
 
+	public void add_feature_test_macro (string feature_test_macro) {
+		if (!(feature_test_macro in features)) {
+			feature_test_macros.append (new CCodeFeatureTestMacro (feature_test_macro));
+			features.add (feature_test_macro);
+		}
+	}
+
 	public void add_include (string filename, bool local = false) {
 		if (!(filename in includes)) {
 			include_directives.append (new CCodeIncludeDirective (filename, local));
@@ -133,6 +142,8 @@ public class Vala.CCodeFile {
 
 			comments.write (writer);
 			writer.write_newline ();
+			feature_test_macros.write (writer);
+			writer.write_newline ();
 			include_directives.write (writer);
 			writer.write_newline ();
 			type_declaration.write_combined (writer);