Re: Generating Makefile.in's for specific target platforms (os, cpu)

[Simon Richter]

Hi,

BRM wrote:

> AC_CONFIG_FILES([Makefile os/Makefile
> os/${target_os}/Makefile arch/Makefile
> arch/${target_cpu}/Makefile])

Indeed, that will not work. These are configure time substitutions, 
however automake runs way before that, and there is no way it could know 
all the possible values.

What you really want to do is to generate all the Makefiles, even those 
for platforms that you currently don't build, and use conditionals to go 
into these directories only when you are on the correct platform.

AC_CONFIG_FILES([Makefile os/Makefile os/linux/Makefile 
os/mingw32/Makefile ...])
AM_CONDITIONAL([OS_IS_LINUX], [test ${host_os} = "linux"])

and in os/Makefile.am

SUBDIRS = $(OS_SUBDIRS)

if OS_IS_LINUX
OS_SUBDIRS = linux
endif

automake is able to figure out what possible combinations for SUBDIRS 
exist and generates an extra list of subdirectories, containing them 
all, to be used when building a distribution (so "make dist" will run 
through all subdirs, copying stuff into the distribution dir; as it only 
copies but never compiles this will work as long as none of your other 
substitutions break the Makefile syntax on other systems).

   Simon

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