Re: set cywin spefic flag in mk files in mxe-octave

[Marco Atzeri]

On 06/07/2016 12:55, Tatsuro MATSUOKA wrote:
> I am now trying build octave using cygwin64 on win10.
>
> I have met error in building build-flex.
>
> /bin/sh ./libtool --tag=CC   --mode=link gcc  -g -O2 -no-undefined 
> -version-info 2:0:0  -o libfl.la -rpath 
> /cygdrive/d/usr/Tatsu/program/Octave/octaveBuild/mxe/cygwin/stable/usr/lib 
> libmain.lo libyywrap.lo  -lintl -lm
> libtool: link: gcc -shared  .libs/libmain.o .libs/libyywrap.o   -lintl  -O2   
> -o .libs/cygfl-2.dll -Wl,--enable-auto-image-base -Xlinker --out-implib 
> -Xlinker .libs/libfl.dll.a
> .libs/libmain.o: In function `main':
> /cygdrive/d/usr/Tatsu/program/Octave/octaveBuild/mxe/cygwin/stable/tmp-build-flex/flex-2.5.39/libmain.c:30:
>  undefined reference to `yylex'
> /cygdrive/d/usr/Tatsu/program/Octave/octaveBuild/mxe/cygwin/stable/tmp-build-flex/flex-2.5.39/libmain.c:30:(.text.startup+0x11):
>  relocation truncated to fit: R_X86_64_PC32 against undefined symbol `yylex'
>
>
> Unlike linux, cygwin uses dll as shared libraries  and all symbol should be 
> defined at linking dll.
> I see the how cygwin treat this. They use --disable-shared flag for flex.
> I add --disable-shared to build-flex.mk and build passed.
>
> Perhaps this kind of treatments is required for mxe-octave cygwin build.
>
> How can I add cygwin case flag mk files?
>
> Any suggestions?
>
> Tatsuro

flex is available on cygwin.
Why do you need to build it again ?

Regards
Marco