glad: fixes alias extension resolution

we cannot limit the result set of `get_requirements` to
the list of already existing commands from the feature set,
this way we will not get any new commands to resolve aliases
for -> there wont be any new aliases

closes: Dav1dde#334

glad/generator/util.py

@@ -96,14 +96,14 @@ def find_extensions_with_aliases(spec, api, version, profile, extensions):
     """
     feature_set = spec.select(api, version, profile, extensions)
 
-    command_names = [command.name for command in feature_set.commands]
+    command_names = set(command.name for command in feature_set.commands)
 
     new_extensions = set()
     for extension in spec.extensions[api].values():
         if extension in feature_set.extensions:
             continue
 
-        for command in extension.get_requirements(spec, api, profile, feature_set=feature_set).commands:
+        for command in extension.get_requirements(spec, api, profile).commands:
             # find all extensions which have an alias to a selected function
             if command.alias and command.alias in command_names:
                 new_extensions.add(extension.name)

test/c/compile/gl/alias/007/test.c

@@ -0,0 +1,14 @@
+/*
+ * GL 4.6 No extensions, with aliasing
+ *
+ * GLAD: $GLAD --out-path=$tmp --api="gl:core=4.6" --extensions="" c --alias
+ * COMPILE: $GCC $test -o $tmp/test -I$tmp/include $tmp/src/gl.c -ldl
+ * RUN: $tmp/test
+ */
+
+#include <glad/gl.h>
+
+int main(void) {
+    (void) glActiveTextureARB;
+    return 0;
+}

test/c/compile/gles2/alias/001/test.c

@@ -0,0 +1,16 @@
+/*
+ * GLES2 No extensions, with aliasing
+ *
+ * Issue: https://github.com/Dav1dde/glad/issues/334
+ *
+ * GLAD: $GLAD --out-path=$tmp --api="gles2=3.2" --extensions="" c --alias
+ * COMPILE: $GCC $test -o $tmp/test -I$tmp/include $tmp/src/gles2.c -ldl
+ * RUN: $tmp/test
+ */
+
+#include <glad/gles2.h>
+
+int main(void) {
+    (void) glGenVertexArraysOES;
+    return 0;
+}