A bit different path conversion problem (and solution)

Fri Feb 20 16:44:00 GMT 1998

I just joined the list because I was having trouble with Unix
v. Windows paths. I dug through the archives a bit and a few threads
over the past several months. (Seems to be a frequently recurring
topic...) None seemed to quite match the problem I had. It turned
out to have a relatively easy fix. I figured others might find it
useful.
We are using gnu-win32 to port some Unix code to Windows. We already
relied on GNU make, gcc and g++, so the logical choice was to use
gnu-win32 as a build environment. The problem is that not all of the
GNU tools treat paths consistently. GNU cpp wants DOS-ish filenames
(e.g., h:/some/path), while GNU make wants Unix-ish filenames (.e.g.,
//h/some/path). This posed a problem because we use gcc/g++ -MM to
build dependencies. We'd give it DOS-ish paths and it would
obligingly spit out DOS-ish paths, causing GNU make to barf.
One person I saw fixed the problem by modifying GNU make to accept
DOS-ish filenames. I didn't want to fiddle with compiling any more
tools than absolutely necessary, however. The solution was to
post-process the gcc -MM output:
 export PLATFORM = $(shell uname)
 export PCPLATFORM = CYGWIN32/NT
 ...
 ifeq ($(PLATFORM),$(PCPLATFORM))
 DOSIFY = -e "s@\([a-z]\):/@//1円/@g"
 endif
 %.d: %.c
	 $(SHELL) -ec 'gcc -MM $(CPPFLAGS) $< | sed -e "s/$*.o/& $@/g" $(DOSIFY) > $@'
Just another itty-bitty tool for your toolbox...
Have a nice weekend,
-- 
Skip Montanaro
(skip@calendar.com)
518-372-5583
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