mingw compiler on cygwin, and path issues

[Jan Engelhardt]

Hi,


I am currently using automake in a Windows-related project; there is a 
(pure) mingw compiler in c:\mingw, and cygwin is installed in c:\cygwin.
Now I noticed that Makefile.in, as generated by automake, has a 
CYGPATH_W variable which is `echo` on Unices, and `cygpath -w` on 
Cygwin. The problem is with a Makefile.am as simple as:

AM_CFLAGS = -I${abs_top_builddir}/subproject
AM_LDFLAGS = -L${abs_top_builddir}/subproject

This gets expanded into -I/home/User/project/subproject, but the mingw 
compiler of course tries to search in C:\home\user\project\subproject 
instead of c:\cygwin\home\user\project. Using -L`${CYGPATH_W} 
${abs_top_builddir}` also makes for a whacky command line later on where 
it tries to use something like 
C:\cygwin\home\user\project/subproject/libfoo.la.

In the end I settled with -L`cygpath -m ${abs_top_builddir}` but that 
does not quite thrill me. Is there a better way - from a technical 
point? (I could use ${top_builddir} but having to relativize everything.)