Re: IF condition inside Makefile.am

[Daniel Herring]

On Mon, 29 Oct 2012, The_Jav wrote:

> I would like to create an if condition. But it works partially :
>
> libmy_lib_SOURCES = source.c
> if HAVE_IPP
> libmy_lib_SOURCES += ipp.c
> endif
>
> when the HAVE_IPP is false, the makefile created is different than a
> makefile created with only "libmy_lib_SOURCES = sources.c"
>
> why ?

There are two reasons I can think of.  First, there is a fundamental 
difference; with the IF, Automake knows it needs to distribute ipp.c. 
Second, there is an accidental difference; IF is implemented by configure 
substitutions, and this works by selectively commenting out some lines in 
the Makefile.

In both cases (without IF or without ipp.c), normal compilation should be 
the same.  Are you seeing any other behavior changes as well?

- Daniel