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The makefile of an export NOGTK project dropped an option -lpng [message #29575]

Mon, 01 November 2010 12:02

sevenjay
Messages: 30
Registered: October 2008
Location: Taiwan

Member

The makefile dropped an option -lpng when theide exports a project with flag NOGTK.
(Build->Output mode->Export project)
When you make it will get lots of errors like "undefined reference to png_create_read_struct".

I Solve it by add an option -lpng in the Makefile.

I hope this is helpful.

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29587 is a reply to message #29575]

Tue, 02 November 2010 00:41

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi Sevenjay,

Thanks for spotting this, it should be fixed now. It was caused by comparing unix style and windows style path, such a simple detail as \ vs. / makes a difference Smile

If M$ would follow the same conventions as the rest of us, none of this would happen Twisted Evil

Funny thing is, that it didn't make any trouble in normal mode (without NOGTK), as libpng is pulled in by gtk. I guess that is one of the reasons nobody noticed that so far (the scarce usage of exported makefiles being the other reason).

Best regards,
Honza

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29588 is a reply to message #29587]

Tue, 02 November 2010 05:17

sevenjay
Messages: 30
Registered: October 2008
Location: Taiwan

Member

Thank you.

I am sorry that I didn't mention it was happened on Ubuntu 10.04.

Maybe something on my environment goes wrong?

the attachment is the makefile.

To make it gets errors like below:

_out/plugin/png/GCC-Gcc-Gui-Linux-Nogtk-Posix-Shared/png.a(pngupp.o): In function `Upp::PNGRaster::Init()':
pngupp.cpp:(.text._ZN3Upp9PNGRaster4InitEv+0x2d): undefined reference to `png_create_read_struct'
pngupp.cpp:(.text._ZN3Upp9PNGRaster4InitEv+0x64): undefined reference to `png_create_info_struct'

To solve it just insert this in the 134 line:

			-lpng \

I check it does have included the package png.

my gcc is (Ubuntu 4.4.3-4ubuntu5) 4.4.3.

Attachment: Makefile
(Size: 386.58KB, Downloaded 331 times)

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29590 is a reply to message #29588]

Tue, 02 November 2010 07:50

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Oups, looks like I wasn't clear enough... What I meant was that I tracked down the bug and committed a fix Wink

Just update your theide to 2830 or higher.

Honza

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29595 is a reply to message #29590]

Tue, 02 November 2010 12:02

cbpporter
Messages: 1427
Registered: September 2007

Ultimate Contributor

Question: why does linking with plugin/png not solve this problem? Why are we still relying on external .so?

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29598 is a reply to message #29595]

Tue, 02 November 2010 14:07

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

cbpporter wrote on Tue, 02 November 2010 12:02

Question: why does linking with plugin/png not solve this problem? Why are we still relying on external .so?

Answer: plugin/png uses the libpng sources (plugin/png/lib/*) on win32, but on other systems, the native libpng.so is used (and only part of the plugin/png code is compiled, namely the U++ encapsulation)

I can only guess the reasons for this, but I agree with it. Libpng is available in default installation of most, if not all, Linux distributions, so there should be no problem with that.

Honza

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Re: The makefile of an export NOGTK project dropped an option -lpng [message #29609 is a reply to message #29598]

Wed, 03 November 2010 17:47

sevenjay
Messages: 30
Registered: October 2008
Location: Taiwan

Member

Those are a good question and a good answer.
I understand now. Thank you both.

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