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Bug 2298 - undefined reference to `IID_IUnknown' on cygwin
Summary: undefined reference to `IID_IUnknown' on cygwin
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: build (show other bugs)
Version: 2.0.1
Hardware: x86 Windows 7
: P2 normal
Assignee: Sam Lantinga
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-12-11 19:40 UTC by Brian Minton
Modified: 2014-02-22 23:35 UTC (History)
1 user (show)

See Also:

Attachments
full link errors (6.82 KB, text/plain)
2013-12-11 19:40 UTC, Brian Minton 		Details
Cygwin uuid library shadowing patch (907 bytes, patch)
2014-02-19 23:08 UTC, Robert Williamson 		Details | Diff
View All Add an attachment (proposed patch, testcase, etc.)

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Description Brian Minton 2013-12-11 19:40:04 UTC 
Created attachment 1495 [details]
full link errors

This applies to 2.0.1 and latest hg as well.

When building static or shared libraries on cygwin 1.7.25 on Windows 7 (32-bit), I get the following link errors:

build/.libs/SDL_windowskeyboard.o: In function `UIElementSink_QueryInterface@12':
/home/c-bminton/src/SDL/src/video/windows/SDL_windowskeyboard.c:995: undefined reference to `IID_IUnknown'
build/.libs/SDL_windowskeyboard.o: In function `IPPASink_QueryInterface@12':
/home/c-bminton/src/SDL/src/video/windows/SDL_windowskeyboard.c:1101: undefined reference to `IID_IUnknown'
collect2: error: ld returned 1 exit status
Makefile:126: recipe for target 'build/libSDL2.la' failed
make: *** [build/libSDL2.la] Error 1
Comment 1 Robert Williamson 2014-02-19 23:08:58 UTC 
Created attachment 1565 [details]
Cygwin uuid library shadowing patch

I had the same issue, it's related to a shadowed uuid library. See:

http://www.mail-archive.com/cygwin@cygwin.com/msg106029.html
http://article.gmane.org/gmane.os.cygwin.ports.general/736

I worked around it with the attached patch based off of
https://code.google.com/p/mintty/source/diff?spec=svn1025&r=1025&format=side&path=/trunk/Makefile
Comment 2 Sam Lantinga 2014-02-22 23:35:06 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/751605725282