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https://issues.apache.org/jira/browse/DISPATCH-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17455315#comment-17455315
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ASF GitHub Bot commented on DISPATCH-2272:
------------------------------------------
ganeshmurthy commented on a change in pull request #1413:
URL: https://github.com/apache/qpid-dispatch/pull/1413#discussion_r764969413
##########
File path: include/qpid/dispatch/internal/export.h
##########
@@ -0,0 +1,27 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. The ASF licenses this file
+* to you 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.
+*/
+
+/// @cond INTERNAL
+
+/// import/export macros
+#if defined(_WIN32)
+# define QD_EXPORT __declspec(dllexport)
+#else
+# define QD_EXPORT __attribute__((visibility("default")))
__attribute__((used))
Review comment:
I was looking at this -
https://developer.arm.com/documentation/dui0491/f/Compiler-specific-Features/--attribute----used---function-attribute?lang=en
It seems to say that "This function attribute informs the compiler that a
static function is to be retained in the object file, even if it is
unreferenced."
Is it true that __attribute__((used)) can *only* be used on *static*
functions ?
I also understand from reading this -
https://developer.arm.com/documentation/dui0491/f/BABCJJID - that
__attribute__((used)) can also be used with *static* variables, although I
understand that this PR is not attempting to do so.
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> Mark all functions called from Python with QD_EXPORT
> ----------------------------------------------------
>
> Key: DISPATCH-2272
> URL: https://issues.apache.org/jira/browse/DISPATCH-2272
> Project: Qpid Dispatch
> Issue Type: Sub-task
> Affects Versions: 1.17.0
> Reporter: Jiri Daněk
> Priority: Major
>
> Dispatch requires that all C functions it calls be exported, because it looks
> them up as if in a dynamic library. This is important on Windows, where
> functions are unexported by default.
> On Windows, use {{__declspec(dllexport)}} to turn on exporting. Without it,
> the functions will not be found from Python.
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