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wxWidgets linker errors.
I am currently starting to get into wxWidgets programming. I successfully build wxWidgets, and creating a new wxWidgets project in Code::Blocks works (builds and executes) just fine.
I tried to write an own wxWidgets application from an empty project myself though, and somehow I always fail to build it. My program itself is just some basic hello world program (+ a windows resource file that basically just includes the wxWidgets one),and since the error occurs on the linking stage I think it's pointless to post the source here: I get those errors:
Info:
wxWidgets version 2.8.12
Compiler: MinGW 4.2.3
IDE: Code::Blocks (02 April 2011 Nightly Build)
Link libraries:
libwxmsw28u.a
Linker options:
-Wl,--enable-auto-import
Search Directories:
Compiler:
$(#wx.include)
$(#wx.lib)\gcc_dll\mswu
Linker:
$(#wx.lib)\gcc_dll
Resource Compiler:
$(#wx.include)
$(#wx.lib)\gcc_dll
$(#wx.lib)\gcc_dll\mswu
I have already compared my settings to the default ones the wxWidgets wizard creates, and haven't found any significant differences.
I tried to write an own wxWidgets application from an empty project myself though, and somehow I always fail to build it. My program itself is just some basic hello world program (+ a windows resource file that basically just includes the wxWidgets one),and since the error occurs on the linking stage I think it's pointless to post the source here: I get those errors:
obj\Debug\main.o||In function `wxStringBase':| C:\Programmieren\wxWidgets-2.8.12\include\wx\string.h|368|undefined reference to `wxStringBase::InitWith(char const*, unsigned int, unsigned int)'| obj\Debug\main.o:main.cpp:(.rdata$_ZTV5MyApp[vtable for MyApp]+0x44)||undefined reference to `wxApp::Initialize(int&, char**)'| ||=== Build finished: 2 errors, 0 warnings (0 minutes, 1 seconds) ===| |
Info:
wxWidgets version 2.8.12
Compiler: MinGW 4.2.3
IDE: Code::Blocks (02 April 2011 Nightly Build)
Link libraries:
libwxmsw28u.a
Linker options:
-Wl,--enable-auto-import
Search Directories:
Compiler:
$(#wx.include)
$(#wx.lib)\gcc_dll\mswu
Linker:
$(#wx.lib)\gcc_dll
Resource Compiler:
$(#wx.include)
$(#wx.lib)\gcc_dll
$(#wx.lib)\gcc_dll\mswu
I have already compared my settings to the default ones the wxWidgets wizard creates, and haven't found any significant differences.
The first question is: Did you make sure that you've listed all needed libs in your environment?
The next thing is this:
I have to include that every once in a while due to windows macros
The next thing is this:
#include <wx/msw/winundef.h> I have to include that every once in a while due to windows macros
Well, I define the following macros
Frankly, I have no idea. As I said, I am new to wxWidgets - though I would have thought that libwxmsw28u.a (I think the MSVC equivalent would be wxmsw28u.lib) is enough. As I said, I looked into the build options of a template wxWidgets project which actually does get compiled and linked just fine (which is also the reason why I am fairly certain that my wxWidgets build is fine).
And again: This is just a basic wxWidgets hello_world program - I really don't do anything else than creating a new frame with the caption "Hello World" and a small menu bar, I don't use any headers other than
EDIT: Forget it. I have absolutely no idea what I am doing differently, but for some reason it seems to work now.
EDIT2: Now it doesn't work again. Removed the macros and it didn't work anymore, inserted the macros again and it doesn't work. Huh, I have no idea what's going on.
EDIT3: Apparently, it actually has something to do with winundef.h, so thanks for that. But I still have troubles figuring out how exactly it works, cause if I compile it once with winundef.h and then again without it still works... I am a bit confused (epic understatement).
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| Did you make sure that you've listed all needed libs in your environment? |
Frankly, I have no idea. As I said, I am new to wxWidgets - though I would have thought that libwxmsw28u.a (I think the MSVC equivalent would be wxmsw28u.lib) is enough. As I said, I looked into the build options of a template wxWidgets project which actually does get compiled and linked just fine (which is also the reason why I am fairly certain that my wxWidgets build is fine).
And again: This is just a basic wxWidgets hello_world program - I really don't do anything else than creating a new frame with the caption "Hello World" and a small menu bar, I don't use any headers other than
#include <wx/wx.h> ...EDIT: Forget it. I have absolutely no idea what I am doing differently, but for some reason it seems to work now.
EDIT2: Now it doesn't work again. Removed the macros and it didn't work anymore, inserted the macros again and it doesn't work. Huh, I have no idea what's going on.
EDIT3: Apparently, it actually has something to do with winundef.h, so thanks for that. But I still have troubles figuring out how exactly it works, cause if I compile it once with winundef.h and then again without it still works... I am a bit confused (epic understatement).
Last edited on
Enable full command-line logging in Code::Blocks and see the output, then do the same.
The documantation says that the libraries can be build in two ways: monolithic and multilib http://docs.wxwidgets.org/stable/wx_librarieslist.html#librarieslist
the latter is default. Looks like that's your problem?
the latter is default. Looks like that's your problem?
I did built in monolithic though. And as I said above, the error is fixed when I include winundef.h and define the macros I stated earlier. It's probably just some very weird and very random windows related error.
(Now that I think about it, I think it was stated somewhere that while wx/wx.h usually includes wx/app.h, it doesn't always do so - that might have been the problem here).
(Now that I think about it, I think it was stated somewhere that while wx/wx.h usually includes wx/app.h, it doesn't always do so - that might have been the problem here).
If I recall correctly the including of "winundef.h" is needed if you have included <windows.h> or one or two other windows headers.
Tim S.
Tim S.
I think you forgot to link with libwxbase28u.a and libwxmsw28u_core.a. Also you said that you link with libwxmsw28u.a but there is no such library in my system.
Try the simple application here. Just copy and paste for testing.
http://www.zetcode.com/tutorials/wxwidgetstutorial/firstprograms/
It compiles with no problems with my system. Here's the html log from code::blocks.
Also note that there is no spaces in your resource compiler directory. Hope that helps.
Good luck!!
[edit]
Fix my sentence.
[edit]
Here's my build, hoping it would help.
Try the simple application here. Just copy and paste for testing.
http://www.zetcode.com/tutorials/wxwidgetstutorial/firstprograms/
It compiles with no problems with my system. Here's the html log from code::blocks.
mingw32-g++.exe -Wall -D__GNUWIN32__ -D__WXMSW__ -DWXUSINGDLL -DwxUSE_UNICODE -O2 -ID:\dev\lib\wxMSW-2.8.11\include -ID:\dev\lib\wxMSW-2.8.11\lib\gcc_dll\mswu -c "C:\Documents and Settings\Hernandez\Desktop\wx2\simple.cpp" -o obj\Release\simple.o mingw32-g++.exe -Wall -D__GNUWIN32__ -D__WXMSW__ -DWXUSINGDLL -DwxUSE_UNICODE -O2 -ID:\dev\lib\wxMSW-2.8.11\include -ID:\dev\lib\wxMSW-2.8.11\lib\gcc_dll\mswu -c "C:\Documents and Settings\Hernandez\Desktop\wx2\main.cpp" -o obj\Release\main.o mingw32-g++.exe -LD:\dev\lib\wxMSW-2.8.11\lib\gcc_dll -o bin\Release\wx2.exe obj\Release\simple.o obj\Release\main.o -s -lwxbase28u -lwxmsw28u_core |
Also note that there is no spaces in your resource compiler directory. Hope that helps.
Good luck!!
[edit]
Fix my sentence.
[edit]
Here's my build, hoping it would help.
mingw32-make -f makefile.gcc BUILD=release SHARED=1 UNICODE=1 USE_OPENGL=1 |
Last edited on
I already said, I have a monolithic build, so I only need libwxmsw28u.a - I don't even have the two libs you posted. And I already said that it is not related to the libraries I am linking, but to the macros I am defining. I also asked in the wxWidgets forum and in short, it appears to be a Unicode problem combined with that for some reason, my wx/wx.h apparently doesn't include wx/app.h as it should.
I build the same source code from zetcode with monolithic build and works fine for me. What errors are you getting now? Did you have luck on the other forum?
[edit]
Oops!! You're using 2.8.12, mine is 2.8.11. I didn't know a new stable build is release. I'll check that out tomorrow, better sleep for now.
Again good luck!! ^^
[edit]
Oops!! You're using 2.8.12, mine is 2.8.11. I didn't know a new stable build is release. I'll check that out tomorrow, better sleep for now.
Again good luck!! ^^
Last edited on
Well, as I already said, I got it working with including wx/app.h +
-- I should probably mark this as solved to avoid further confusion, the only reason I didn't do so yet was cause I was actually hoping someone here would know where this is documented so I can avoid similar errors in the future. Well, whatever.
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-- I should probably mark this as solved to avoid further confusion, the only reason I didn't do so yet was cause I was actually hoping someone here would know where this is documented so I can avoid similar errors in the future. Well, whatever.
Last edited on
From docs/tech/tn0019.txt here's the note; if "winundef.h" fixed the problem.
Tim S.
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Tim S.
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