Re: Using libtool via autotools causes linking problem on mingw

[Peter Rosin]

On 2013-11-07 22:00, Panicz Maciej Godek wrote:
> Hi,
> For some time I've been trying to compile my framework
> for writing multimedia and 3d games in Guile Scheme
> on Windows/MinGW.
> The framework uses SDL library, and more details can be
> found here: https://puszcza.gnu.org.ua/projects/slayer
> 
> After many issues with compiling Guile Scheme on MinGW,
> I've finally managed to achieve it, and having build SDL,
> I proceeded to compile my framework.
> 
> Although I did use the autotools to create a package,
> I know only superficially how it is supposed to work.
> Having ./configured my project, I managed to build the
> object files, but the final linking (performed by libtool)
> fails. It is invoked in the following way:
> 
> ./libtool --tag=CXX   --mode=link g++ -D_GNU_SOURCE=1 -Dmain=SDL_main 
> -Ic:/mingw/msys/1.0/include/SDL   -Ic:/mingw/msys/1.0/include/guile/2.0 
> -I/usr/local/include -Ic:/mingw/msys/1.0/include    -Wall -Werror -mwindows 
> -Lc:/mingw/msys/1.0/lib -lmingw32 -lSDLmain -lSDL   -Lc:/mingw/msys/1.0/lib 
> -lguile-2.0 -lgc     -mwindows -Lc:/mingw/msys/1.0/lib -lSDL_image -lmingw32 
> -lSDLmain -lSDL   -g -O2 -mwindows -Lc:/mingw/msys/1.0/lib -lmingw32 
> -lSDLmain -lSDL   -Lc:/mingw/msys/1.0/lib -lguile-2.0 -lgc     -mwindows 
> -Lc:/mingw/msys/1.0/lib -lSDL_image -lmingw32 -lSDLmain -lSDL    -o 
> slayer.exe file.o font.o image.o input.o slayer.o symbols.o video.o    
> -lSDL_ttf 
> 
> and the following error appears:
> c:/mingw/msys/1.0/lib/libmingw32.a(main.o): In function `main':
> e:\p\giaw\src\pkg\mingwrt-4.0.3-1-mingw32-src\bld/../mingwrt-4.0.3-1-mingw32-src/src/libcrt/crt/main.c:91:
>  undefined reference to address@hidden'
> collect2.exe: error: ld returned 1 exit status
> 
> However, I do manage to build the executable with the following command:
> gcc -o slayer.exe file.o font.o image.o input.o slayer.o symbols.o video.o 
> -mwindows -lmingw32 -lSDLmain -lSDL -lSDL_image -lSDL_ttf -lguile-2.0
> 
> (there are still some problems caused by libguile in the runtime, but at 
> least the linkign stage succeeds)
> 
> I know that it might be a complicated issue, and the cause might lie on the 
> side of either MinGW or SDL or pkg-config or autotools or mine, but I thought 
> it might be best to ask you first.
> 
> The project's files can be browsed here
> http://hg.gnu.org.ua/hgweb/slayer/file/bb4c97fd8329

Hi!

This is a classic error. You have to specify libraries *after* the object
files and other libraries that need them in order to be portable. In your
case the specifics are that you are adding a lot of $(FOO_LIBS) vars to
AM_LDFLAGS in src/Makefile.am when you should probably have specified
them in slayer_LDADD or something such instead.

Hope that helps.

Cheers,
Peter