Errors when trying to cross compile for windows platform (on Linux)

[mgorges]

hello. Im try cross compile linux for windows platform.

checking build system type... x86_64-unknown-linux-gnu
checking host system type... i386-pc-mingw32
checking target system type... i386-pc-mingw32
checking for i386-mingw32-gcc... arg++ -g -O0 -isysroot /usr/mingw-w64-v8.0.0_gcc10.2.0/x86_64-w64-mingw32/ -DWIN32 -DWINVER=0x0501 -fcommon -I/root/.cache/lambdanative/win32/include -L/root/.cache/lambdanative/win32/lib
checking whether the C compiler works... no
configure: error: in /root/.lambdanative/tmp_install/gambc-v4_7_9': configure: error: C compiler cannot create executables See config.log' for more details

I tried various ways but I can't get it to compile. how I can help?

Originally posted by @gassechen in #389 (comment)

[mgorges]

@gassechen can you provide more insights into a) what version of linux you are using, b) where the gcc for the win32 cross compiler is located, c) what you specified for WIN32SDK in SETUP, d) if the compiler actually runs (as in when you call the binary for gcc what do you get)?

[gassechen]

'SO version slackware64 '
'mingw-w64-v8.0.0_gcc10.2.0'
'WIN32SDK=find /usr/mingw-w64-v8.0.0_gcc10.2.0 -maxdepth 0 -print 2> /dev/null | tail -n 1
'i686-w64-mingw32-gcc -o hello.exe hello.c' works

[gassechen]

=> compiling application../usr/mingw-w64-v8.0.0_gcc10.2.0/bin/i686-w64-mingw32-gcc -g -O0 -I/root/.cache/lambdanative/win32/include -mwindows win32_microgl.c main.c icon.o -o /root/.cache/lambdanative/win32/Calculator/Calculator.exe -L/root/.cache/lambdanative/win32/lib -lpayload -lglu32 -lopengl32 -lgdi32 -lwinmm -lwsock32 -lws2_32 -lrpcrt4 -lcrypt32 -lm
/usr/mingw-w64-v8.0.0_gcc10.2.0/bin/../lib/gcc/i686-w64-mingw32/10.2.0/../../../../i686-w64-mingw32/bin/ld: /root/.cache/lambdanative/win32/lib/libpayload.a(system.o):system.c:(.bss+0x0): multiple definition of cmd_argv'; /tmp/cce50vV1.o:main.c:(.bss+0x4): first defined here /usr/mingw-w64-v8.0.0_gcc10.2.0/bin/../lib/gcc/i686-w64-mingw32/10.2.0/../../../../i686-w64-mingw32/bin/ld: /root/.cache/lambdanative/win32/lib/libpayload.a(system.o):system.c:(.bss+0x4): multiple definition of cmd_argc'; /tmp/cce50vV1.o:main.c:(.bss+0x0): first defined here
collect2: error: ld returned 1 exit status
ERROR: failed with exit code 1
BUILD FAILED
Now complile with errors...
multiple definition of `cmd_argc';

[gassechen]

OK Calculator app for windows WORK.
this is my /targets/win32/host_linux file

win_sysroot=ls -1d ${WIN32SDK}/bin/i686-w64-mingw32-gcc | head -n 1
win_cross=ls -1 ${WIN32SDK}/bin/i686-w64-mingw32-gcc | head -n 1 | sed 's/gcc$//'
#SYS_CC=$win_cross"gcc $SYS_DEBUGFLAG -isysroot $win_sysroot -DWIN32 -DWINVER=0x0501 -fcommon -lmingw32 $cflag_additions"
#SYS_CXX=$win_cross"g++ $SYS_DEBUGFLAG -isysroot $win_sysroot -DWIN32 -DWINVER=0x0501 -fcommon -lmingw32 $cflag_additions"
SYS_CC=$win_cross"gcc $SYS_DEBUGFLAG -fcommon"
SYS_CXX=$win_cross"g++ $SYS_DEBUGFLAG -fcommon"
SYS_AR=$win_cross"ar"
SYS_RANLIB=$win_cross"ranlib"
SYS_STRIP=$win_cross"strip"
SYS_NM=$win_cross"nm"
SYS_STRIP=$win_cross"strip"
SYS_CPP=$win_cross"cpp"
SYS_AS=$win_cross"as"
SYS_LD=$win_cross"ld"
SYS_OBJCOPY=$win_cross"objcopy"
SYS_OBJDUMP=$win_cross"objdump"
SYS_READELF=$win_cross"readelf"
SYS_GPROF=$win_cross"gprof"
SYS_WINDRES=$win_cross"windres"
SYS_NM=$win_cross"nm"
SYS_EXEFIX=".exe"
SYS_APPFIX=

[mgorges]

Using the previous code to auto detect thing and information from http://slackware.alienbase.nl/sbrepos/current/x86/MinGW-w64/MinGW-w64-v8.0.0_gcc10.2.0-i586-1alien.lst, the win_sysroot for your system likely should be '/usr/mingw-w64-v8.0.0_gcc10.2.0/i586-w64-mingw32' and win_cross should be '/usr/mingw-w64-v8.0.0_gcc10.2.0/bin/i586-w64-mingw32-' but that doesn't seem to be the case?

[gassechen]

Calculator Works (run in wine)
DemoHybridApp Woks (run in wine )
DemoCube Works (run in wine)
DemoSerial Work (run in wine)
If you tell me I could try a specific one.

[mgorges]

Great, so you also solved the multiple definition of `cmd_argc' issue?

[mgorges]

I think the difference is that your win_sysroot of /usr/mingw-w64-v8.0.0_gcc10.2.0/bin/i686-w64-mingw32-gcc is not what we'd expect, which should be something like /usr/mingw-w64-v8.0.0_gcc10.2.0/i686-w64-mingw32 ? Also isn't your sys_root a file now, not a folder?

[gassechen]

yes with -fcommon
SYS_CC=$win_cross"gcc $SYS_DEBUGFLAG -fcommon"
SYS_CXX=$win_cross"g++ $SYS_DEBUGFLAG -fcommon

I do not know what to do. comment them for now. and everything is compiling and works. It would be important if you require any specific application to test that may make use of those $cflag_additions

[mgorges]

2be77d6 adds -fcommon to solve multiple definition GCC 10 issue for Linux but it seems also to be needed for cross compilation on Linux targeting win32. Will add that to master - thanks. Not sure about the win_sysroot not detecting right?

[mgorges]

Your change actually doesn't use the win_sysroot at all, so that might not be the issue. a4632ca adds the -fcommon an all three host platforms.

[gassechen]

I will verify the win_sysroot usage.
the difference with http://slackware.alienbase.nl/sbrepos/current/x86/MinGW-w64/MinGW-w64-v8.0.0_gcc10.2.0-i586-1alien.lst
is that I have slackware64
this is the package https://slackware.pkgs.org/current/alienbob-x86_64/MinGW-w64-v8.0.0_gcc10.2.0-x86_64-1alien.txz.html
but they are in the same folder.

[mgorges]

Sorry, I didn't find the right version file. From this listing /usr/mingw-w64-v8.0.0_gcc10.2.0/i686-w64-mingw32 and /usr/mingw-w64-v8.0.0_gcc10.2.0/bin/x86_64-w64-mingw32- would be what I would want the targets/win32/host_linux#L39 script to automatically detect, but it somehow failed to do that.?