[Xlibs] Shared library support on Cygwin
Wed, 14 Jan 2004 15:04:42 +1030
Around 13 o'clock on Jan 13, Harold L Hunt II wrote:
> 1) We need to set "LDFLAGS = -no-undefined" for all libraries that do
> not export undefined symbols.
I believe this can't be used in Xlib because of pthread functions called
while threading is enabled -- on some systems, these functions are found
in -lpthread, and Xlib isn't explicitly linked to pthread to avoid mapping
that file in every application on the system.
> 2) This may be related to #1... but Xau is being directly linked when
> X11 is linked. Currently, Xau is built as static (but the question is,
> does it have to be static, or does it not export undefined symbols?); on
> Cygwin, shared libraries cannot be linked to static libraries, so X11
> will be forced to be static only if linked to a static Xau.
The few Xau functions used in Xlib used to be compiled by linking the
source files into the Xlib directory and building them there. I changed
this to build Xau as a shared library and just use that. I don't know if
this is the right way of doing stuff. If you want to change this, I
suggest using the same mechanism as used by xtrans -- have Xau install the
necessary source files into an include directory and building them into
Xlib by creating a .c file that references them.
If you just want to leave stuff alone, you should be able to build/install
Xau and then X11 will use the shared version of the library that should
get installed just fine.
I don't have a strong opinion here; sharing code is good, but there aren't
a huge number of applications using other Xau code, and having another
library mapped into ever X application is bad.