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GNU Autoconf, Automake, and Libtool
book

GNU Autoconf, Automake, and Libtool

by Gary V. Vaughan, Ben Elliston, Tom Tromey, Ian Lance Taylor
October 2000
Intermediate to advanced
432 pages
9h 9m
English
Sams
Content preview from GNU Autoconf, Automake, and Libtool

6.6. Multiple Directories

So far, we have dealt only with single-directory projects. Automake can also handle projects with many directories. The variable 'SUBDIRS' is used to list the subdirectories that should be built. Here is an example from Automake itself:

SUBDIRS = . m4 tests

Automake does not need to know the list of subdirectories statically, so there is no 'EXTRA_SUBDIRS' variable. You might think that Automake would use 'SUBDIRS' to see which 'Makefile.am's to scan, but it actually gets this information from 'configure.in'. This means that if you have a subdirectory optionally built, you should still list it unconditionally in your call to AC_OUTPUT, and then arrange for it to be substituted (or not, as appropriate) at configure

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