On 11/09/2012 12:24 AM, Vincent Torri wrote: > Hey > > AC_ARG_WITH sets a variable named loaders and set to (for example) > gif,tiff (actually, it's a comma separated list, there can be more > than 2 'elements') > > What I want to do is plitting it into gif and tiff and manipulate those. > > I know how to do that with m4_foreach ith an m4 list. But i don't know > what to do with just a variable. > > what should i do ? That doesn't give me much to go on. Show me some actual configure.ac code you have tried to write to demonstrate what you are really trying to do. It sounds like you have: AC_ARG_WITH([loaders], [help string]...) where the user is calling: ./configure --with-loaders=gif,tiff and you are now trying to write shell code that iterates over the contents of $with_loaders? If so, look at coreutils.git:m4/include-exclude-prog.m4 - there, you have the example of using AC_ARG_ENABLE (not AC_ARG_WITH) to set up $enable_install_program to a comma separated list, followed by manipulations in shell to operate individually on each member of the list. But there's no real way to do m4-time looping of the list, since the contents of the list won't be known until the user supplies the configure argument - you'll have to do all your list manipulation at shell time. Note, however, that it is possible to write shell loops around m4 macros, so that you call an m4 macro to operate on a shell variable's contents rather than a literal string (again, in the coreutils example, you'll notice how at the end of the file there is a for loop using $gl_i to iterate over the list, but within the for loop is a call to AC_MSG_WARN if something went wrong). -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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