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0013643

CMake

Modules

public

2012-11-02 06:13

2013-10-07 10:09

Reporter

Gregoire

Assigned To

Stephen Kelly

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

Target Version

CMake 2.8.12

Fixed in Version

Summary

0013643: GenerateExportHeader should work for module libraries too

Description

I am doing my tests with visual 2008 and mingw.

As far as I understand a module is like a shared library that cannot
be linked. Instead it is dynamically loaded and then we find and use
symbols in it. It is like doing the linker's job manually at runtime.

If nothing is exported from my module then I do cannot find any
symbol in it. Or at least I do not know how to do so.

I modified the GenerateExportHeader module to be able to export
symbols from my MODULE:

# if(${type} STREQUAL "MODULE")
   # message(WARNING "This macro should not be used with libraries of
   # type MODULE") return()
# endif()
if(NOT ${type} STREQUAL "STATIC_LIBRARY" AND NOT ${type} STREQUAL "SHARED_LIBRARY" AND NOT ${type} STREQUAL "MODULE_LIBRARY")
   message(WARNING "This macro can only be used with libraries")
   return()
endif()

Steps To Reproduce

Build a module with visual without exported symbols.
Use depends.exe (from http://www.dependencywalker.com/ [^]) to open the generated dll.
It will not find any symbols which means that your application won't be able to find it either, the module is useless.

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Notes
(0031491) David Cole (manager) 2012-11-08 09:25	This request does make sense. Even when building a module, you want to export the symbols. It's just that the consumer of it agrees not to link to it via its exports, but instead dynamically loads it, looks up the exports and then calls them at runtime. Don't forget: it's unusual, but possible to export symbols from executables as well. Just delete the restriction about "module" library type, and allow this to be called for all target types.

(0033126) Stephen Kelly (developer) 2013-05-24 09:45	Fixed with 7ffef5024aa92a9802785c2e02abfd13249e6160

(0034062) Robert Maynard (manager) 2013-10-07 10:09	Closing resolved issues that have not been updated in more than 4 months.

Issue History
Date Modified	Username	Field	Change
2012-11-02 06:13	Gregoire	New Issue
2012-11-08 04:22	David Cole	Target Version	=> CMake 2.8.11
2012-11-08 08:24	Brad King	Assigned To	=> Stephen Kelly
2012-11-08 08:24	Brad King	Status	new => assigned
2012-11-08 09:25	David Cole	Note Added: 0031491
2013-05-17 09:33	Robert Maynard	Target Version	CMake 2.8.11 => CMake 2.8.12
2013-05-24 09:45	Stephen Kelly	Note Added: 0033126
2013-05-24 09:45	Stephen Kelly	Status	assigned => resolved
2013-05-24 09:45	Stephen Kelly	Resolution	open => fixed
2013-10-07 10:09	Robert Maynard	Note Added: 0034062
2013-10-07 10:09	Robert Maynard	Status	resolved => closed