Compiling with mingw32 and SDL 1.2 as console application

[dmitrysmagin]

Hi.
It's possible to compile a console application with mingw32, though you need some manual config

0. I needed to create a ./m4 subfolder and put pkg.m4 inside in order to configure properly. I used this https://github.com/pkgconf/pkgconf/blob/master/pkg.m4 and changed Makefile.am and configure.ac accordingly:

diff --git a/Makefile.am b/Makefile.am
index dd9a7fc..66ea5e4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,3 +3,5 @@ SUBDIRS = src doc
 EXTRA_DIST = adplay.spec adplay.qpg

 AUTOMAKE_OPTIONS = dist-bzip2
+
+ACLOCAL_AMFLAGS = -I m4
diff --git a/configure.ac b/configure.ac
index 565acb2..cdb8938 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,6 +15,8 @@ AC_PROG_CXX
 AC_PROG_CPP
 AC_PROG_CXXCPP

+AC_CONFIG_MACRO_DIRS([m4])
+
 # Nothing works without these libraries...
 AC_CHECK_LIB(stdc++,main,,AC_MSG_ERROR([libstdc++ not installed]))
 PKG_CHECK_MODULES([adplug], [adplug >= 2.0],,[

Only after that the command autoreconf --install finished successfully

1. After that I was able to execute ./configure --prefix=/mingw CXXFLAGS=-fpermissive. But before configuring it's better to fix SDL (below)

2. SDL config problem. By default sdl-config script forces your application to be a windows app, not console, and it intercepts output to sderr and stdout and redirects it into files.
   I've found if you edit sdl-config the configure will fail (sdl won't be found) so I had to edit the resulting Makefile in the following way: removed -Dmain=SDL_main and -lSDLmain and changed -mwindows into -mconsole
   Another important thing: insert #undef main in the adplug.cc right before the main().

3. sdl.h header problem.
   As noted in another issue, windows fs is not case-sensitive, so #include <SDL.h> and #include "sdl.h" are misinterpreted as 'include local sdl.h` by the compiler. To overcome this, better rename ./src/sdl.h into ./src/sdlx.h and change all #includes accordingly

4. Strange typecast is needed in adplug.cc:

diff --git a/src/adplay.cc b/src/adplay.cc
index d93d16f..2973ca0 100644
--- a/src/adplay.cc
+++ b/src/adplay.cc
@@ -239,7 +239,7 @@ static int decode_switches(int argc, char **argv)
     {NULL, 0, NULL, 0}                         // end of options
   };

-  while ((c = getopt_long(argc, argv, "8f:b:d:irms:ol:hVe:O:D:qv",
+  while ((c = getopt_long(argc, (char* const** (*)())argv, "8f:b:d:irms:ol:hVe:O:D:qv",
                          long_options, (int *)0)) != EOF) {
       switch (c) {
       case '8': cfg.bits = 8; break;

After all above the make will succeed and the resulting adplay.exe will show output in the console

dmitrysmagin@3f1135a

[mywave82]

Can you please create some PRs?

• update aclocal to use m4/ directory and put initial needed m4 files there, including pkg.m4

• getopt.h getopt1.c should probably be updated to receive char *const argv[] which is what GNU libc getopt_long() implementation expect, removing the need to that typecast

• rename sdl.h to avoid name-clash (we can probably expect that different compilers to have different order of include directories)

Add support for SDL2.0 and fallback to SDL1.2. For audio I believe the API is identical, and perhaps fixes a couple of the issues.

[dmitrysmagin]

Created PR: #23