compilation fixes for Emscripten, part 1

build-emscripten-sdl2

@@ -15,7 +15,8 @@ export CXX="em++"
 export LD="emcc"
 export LD_CXX="em++"
 export CFLAGS="-DEMTERPRETER_SYNC"
-export CXXFLAGS="-DEMSCRIPTEN=1 -DEMTERPRETER_SYNC -s USE_ZLIB=1 -s TOTAL_MEMORY=95551488 -s ASYNCIFY -s ERROR_ON_UNDEFINED_SYMBOLS=0"
+export CXXFLAGS="-DEMSCRIPTEN=1 -DEMTERPRETER_SYNC -s USE_ZLIB=1 -s USE_SDL=2 -s USE_FREETYPE=1"
+export LDFLAGS="-DEMSCRIPTEN=1 -DEMTERPRETER_SYNC -s USE_ZLIB=1 -s USE_SDL=2 -s USE_FREETYPE=1 -s TOTAL_MEMORY=134217728 -s ASYNCIFY -s ERROR_ON_UNDEFINED_SYMBOLS=0"
 
 # where are we?
 top=`pwd`
@@ -32,9 +33,5 @@ chmod +x configure
     --host=x86_64-linux --disable-fpu-x86 --disable-dynamic-core \
     --enable-sdl2 --with-sdl-prefix=$EMSDK/upstream/emscripten/system \
     --disable-opengl --disable-mt32 --enable-emscripten --enable-force-menu-sdldraw --disable-x11 \
-    --disable-directserial "$@"
+    --disable-avcodec --disable-libslirp --disable-libfluidsynth "$@"
 make -j6 || exit 1
-
-cd src;
-emcc  -DEMSCRIPTEN=1  -s USE_ZLIB=1 -s TOTAL_MEMORY=95551488 -s ASYNCIFY -s ERROR_ON_UNDEFINED_SYMBOLS=0 -std=gnu++14  -Os -DFORCE_SDLDRAW  -Wall   -Wextra   -Wunused   -pedantic   -Wlogical-op   -Wsign-promo   -Wconversion-null   -Wno-deprecated-declarations   -Wno-implicit-fallthrough   -Wno-strict-aliasing   -Wno-missing-field-initializers   -Wno-format-zero-length   -Wno-address-of-packed-member   -Wno-int-to-void-pointer-cast  -I/home/rossimo/dosbox-x -I/home/rossimo/dosbox-x/vs/sdlnet/linux-host/include -I/home/rossimo/dosbox-x/vs/sdlnet/linux-host/include/SDL   -L/home/rossimo/dosbox-x/vs/sdlnet/linux-host/lib -o dosbox-x.html dosbox.o  debug/libdebug.a dos/libdos.a shell/libshell.a builtin/libbuiltin.a ints/libints.a misc/libmisc.a hardware/serialport/libserial.a hardware/parport/libparallel.a libs/porttalk/libporttalk.a gui/libgui.a libs/gui_tk/libgui_tk.a hardware/libhardware.a cpu/libcpu.a hardware/reSID/libresid.a fpu/libfpu.a gui/libgui.a output/liboutput.a hardware/mame/libmame.a libs/zmbv/libzmbv.a libs/decoders/internal/libopusint.a      -s USE_SDL=2 -lz ;
-cd ..

configure.ac

@@ -34,7 +34,7 @@ int main(){
   return 0;
 }
 EOF
-if $CXX $CPPFLAGS $CXXFLAGS -Werror -o conftest.o conftest.c++ [$1] > /dev/null 2>&1
+if $CXX $CPPFLAGS $CXXFLAGS -Werror -c -o conftest.o conftest.c++ [$1] > /dev/null 2>&1
 then
   AC_MSG_RESULT([yes])
   CXXFLAGS="${CXXFLAGS} [$1]"

include/dosbox.h

@@ -20,6 +20,10 @@
 #ifndef DOSBOX_DOSBOX_H
 #define DOSBOX_DOSBOX_H
 
+#if !defined (WIN32)
+/* for mkdir_p, needed by emscripten */
+#include <sys/stat.h>
+#endif
 #include "config.h"
 
 #if defined(C_ICONV)

src/dos/drive_local.cpp

@@ -30,6 +30,9 @@
 #define _DARWIN_C_SOURCE
 #endif
 #ifndef WIN32
+#if defined(EMSCRIPTEN)
+#include <fcntl.h>
+#endif
 #include <utime.h>
 #include <sys/file.h>
 #else