Re: Lua 5.1 build patch

[Mark Edgar <medgar@...>]

Mark Edgar wrote:
> Mike Pall wrote:
>
> > Hi,
> >
> > Luiz Henrique de Figueiredo wrote:
> >
> > > > The attached patch allows Lua to be built on a Cygwin host 
> > > > targetting MinGW:
> > > >
> > > > make "CC=gcc -mno-cygwin" mingw  # build MinGW version
> > >
> > >
> > > Thanks. Shouldn't we then add a cygwin target as below?
> > >
> > > cygwin:
> > >     $(MAKE) "CC=gcc -mno-cygwin" mingw
> >
> >
> >
> > This would be a misnomer, but you may want to do it anyway.
>
>
> No, because in this case, mingw is still the target; Cygwin just happens 
> to be the build environment.  With the s/gcc/$(CC)/ change, the Makefile 
> basically doesn't care if you are building the mingw target using a 
> MinGW build environment or a Cygwin build environment, and this works 
> out just fine.
>
> > [ I guess this requires an explanation:
>
>
> In addition to all of Mike's good information, I'd like to add that 
> ''make posix'' works just fine for the Cygwin target.
>
> Unless you want readline support or you want to build shared objects 
> (DLLs) instead of a static library.  But then most people building Lua 
> from source could figure this out.  The rest should be able to use 
> LuaBinaries, I should think.  ;)

For those who can't or don't want to figure this out, the following 
build configuration works for me:

cygwin:
	$(MAKE) "LUA_A=lua51.dll" "LUA_T=lua.exe" \
	"AR=$(CC) -shared -o" "RANLIB=strip --strip-unneeded" \
	"MYCFLAGS=-DLUA_USE_POSIX -DLUA_USE_DLOPEN -DLUA_BUILD_AS_DLL" \
	"MYLIBS=-lreadline -lhistory -lncurses" "MYLDFLAGS=-s" lua.exe

It's not particularly important to me to have this added to the 
distribution, I just wanted to provide it here.

As an aside, it seems that no Cygwin header declares _longjmp/_setjmp, 
but glibc defines them and they seem to work.  Otherwise, there are no 
other build warnings.  Nice!

					-Mark