October 2000
Intermediate to advanced
432 pages
9h 9m
English
book
GNU Autoconf, Automake, and Libtool
by Gary V. Vaughan, Ben Elliston, Tom Tromey, Ian Lance Taylor
Content preview from GNU Autoconf, Automake, and Libtool
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18.1. Conditionals
Automake conditionals are a way to omit or include different parts of the 'Makefile', depending on what configure discovers. A conditional is introduced in 'configure.in' using the 'AM_CONDITIONAL' macro. This macro takes two arguments: The first is the name of the condition, and the second is a shell expression that returns true when the condition is true.
For instance, here is how to make a condition named 'TRUE' that is always true:
AM_CONDITIONAL(TRUE, true)
As another example, here is how to make a condition named 'DEBUG' that is true when the user has given the '--enable-debug' option to configure:
AM_CONDITIONAL(DEBUG, test "$enable_debug" = yes)
After you have defined a condition in 'configure.in', you can refer ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.