I'm trying to build SDL_perl 2.1.3 on Win32 using MinGW. A custom-built Perl is installed under E:\perl-5.8.7, and the important MinGW files are under E:\msys\1.0\mingw. SDL itself was compiled, along with the supporting libs required by SDL_perl (SDL_mixer, SDL_image, etc.) are also built at that location.

Since SDL was built under MSYS, the paths that sdl-config points to are inside the MinGW system. The normal sdl-config output is:

$ sdl-config --libs
-L/mingw/lib -lmingw32 -lSDLmain -lSDL -mwindows
$ sdl-config --cflags
-I/mingw/include/SDL -Dmain=SDL_main
[download]

Within the Build.PL, there are two variables that hold the compiler and linker flags, respectively, which normally hold the output from sdl-config. I've modified these like this:

my $sdl_compile_flags = '-O2 -Ie:\msys\1.0\mingw\include\SDL -Dmain=SD
+L_main';
my $sdl_link_flags    = '-O2 -Ie:\msys\1.0\mingw\include\SDL -Dmain=SD
+L_main '. 
    '-LE:\msys\1.0\mingw\lib -lmingw32 -lSDLmain -lSDL';
[download]

I have also compiled a working SDL program from a tutorial (the zip file for the code is available at http://gpwiki.org/index.php/Files:SDL_PlaySound.zip). After a lot of playing with the flags, I found that this works:

gcc -O2 -IE:\msys\1.0\mingw\include\SDL -Dmain=SDL_main -c SDL_PlaySou
+nd.c
gcc -O2 -IE:\msys\1.0\mingw\include\SDL -Dmain=SDL_main -o SDL_PlaySou
+nd.exe SDL_PlaySound.o -LE:\msys\1.0\mingw\lib -lmingw32 -lSDLmain -l
+SDL -lSDL_mixer -mwindows
[download]

It seems to be very sensitive to the ordering of the flags, or else you get errors about missing symbols in the linking step (much like the errors below).

The SDL_perl build compiles the program like this:

e:\perl-5.8.7\bin\perl.exe "-Ie:\perl-5.8.7\lib" "-Ie:\perl-5.8.7\lib"
+ "E:\perl-5.8.7\lib\ExtUtils\xsubpp" -noprototypes -typemap "E:\perl-
+5.8.7\lib\ExtUtils\typemap" "src\SDL_perl.xs"gcc -c -s -O2 -DWIN32 -D
+HAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -fno-stri
+ct-aliasing -DPERL_MSVCRT_READFIX -s -O2 -I"E:\perl-5.8.7\lib\CORE" -
+I"E:\msys\1.0\mingw\include" -o "src\SDL_perl.o" "src\SDL_perl.c"
[download]

Which seems to work, but then the linking step goes like this:

dlltool --def "src\SDL_perl.def" --output-exp "blib\arch\auto\SDL_perl
+\SDL_perl.exp"
g++ -o "blib\arch\auto\SDL_perl\SDL_perl.dll" -Wl,--base-file,"src\SDL
+_perl.base" -Wl,--image-base,0x23210000 -mdll -s -Le:\perl-5.8.7\lib\
+CORE -Le:\msys\1.0\mingw\lib -O2 -Ie:\msys\1.0\mingw\include\SDL -Dma
+in=SDL_main -LE:\msys\1.0\mingw\lib -lmingw32 -lSDLmain -lSDL "src\SD
+L_perl.lds" "blib\arch\auto\SDL_perl\SDL_perl.exp"
[download]

(Note that Perl on MinGW compiles using gcc, but links using g++, and therefore all Perl modules that include C code also link using g++. No, I don't know why.)

The 'dlltool' part seems to work fine, but the g++ linking command gives the following errors:

src\SDL_perl.o(.text+0x52f):SDL_perl.c: undefined reference to `SDL_Ge
+tError'
src\SDL_perl.o(.text+0x6e4):SDL_perl.c: undefined reference to `SDL_In
+it'
src\SDL_perl.o(.text+0x8c4):SDL_perl.c: undefined reference to `SDL_In
+itSubSystem'
src\SDL_perl.o(.text+0xa48):SDL_perl.c: undefined reference to `SDL_Qu
+itSubSystem'

[ About 40 other errors along the same lines ]
[download]

So that's where I'm stuck, with my caffeine-overdosed and sleep-deprived brain having run out of ideas.

Update: Changed title to specify the build environment.

Update 2: I've been playing with the linking command a little more. I'm now using this:

g++ -Wl,--base-file,"src\SDL_perl.base" -Wl,--image-base,0x23210000 -s
+ -O2 -o "blib\arch\auto\SDL_perl\SDL_perl.dll" "src\SDL_perl.lds" "bl
+ib\arch\auto\SDL_perl\SDL_perl.exp" -Le:\perl-5.8.7\lib\CORE -LE:\msy
+s\1.0\mingw\lib -lmingw32 -lSDLmain -lSDL -mdll
[download]

Thus putting the libraries being linked to after the files being linked, which is basically what is done in the SDL_PlaySound program noted above. This gets the errors down to just:

blib\arch\auto\SDL_perl\SDL_perl.exp(.edata+0x50):fake: undefined refe
+rence to `boot_'
blib\arch\auto\SDL_perl\SDL_perl.exp(.edata+0x54):fake: undefined refe
+rence to `boot_'
collect2: ld returned 1 exit status
[download]

Which is better than before, anyway. Even if this leads to a working command, I'm still not sure how to coerce Module::Build into producing such a command, since its build/link flags are always placed before the linked files. Although there aren't that many files to compile/link in this program, so I could do it by hand.

Update 3: This works:

g++ -Wl,--base-file,"src\SDL_perl.base" -Wl,--image-base,0x23210000 -s
+ -O2 -o "blib\arch\auto\SDL_perl\SDL_perl.dll" "src\SDL_perl.lds" "bl
+ib\arch\auto\SDL_perl\SDL_perl.exp" -Le:\perl-5.8.7\lib\CORE -LE:\msy
+s\1.0\mingw\lib -lperl58 -lmingw32 -lSDLmain -lSDL -mdll
[download]

Thanks to Perl Monks for being a Cardboard Programmer :)

Now, how to get Module::Build to output that command?

Update 42: Broke again. Don't know what happened. Need sleep.

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