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Document the "#if (defined(__unix__) || defined(unix))" way of including

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sys/param.h.  Change _HAVE_PARAM_H to "HAVE_SYS_PARAM_H" for those who
still like this method -- leading underscores are in the compiler/library
name space and the Ollivier says to follow GNU Autoconf anyway.
This commit is contained in:
David E. O'Brien 1997-01-28 01:43:21 +00:00
parent 21eab473b3
commit c4ed977f90
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=22046
1 changed files with 16 additions and 5 deletions
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21
share/doc/handbook/porting.sgml
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@ -49,16 +49,27 @@ the ports collection.
is already included; if not, add the code:
<tscreen><verb>
#ifdef _HAVE_PARAM_H
#ifdef (defined(__unix__) || defined(unix))
#include <sys/param.h>
#endif
</verb></tscreen>
to the proper place in the <tt>.c</tt> file and add
<tt>-D_HAVE_PARAM_H</tt> to the <tt>CFLAGS</tt> in the
Makefile.
<p>to the proper place in the <tt>.c</tt> file. We believe that every
system that defineds these to symbols has sys/param.h. If you find
a system that doesn't, we would like to know. Please send mail to
<htmlurl url='mailto:ports@FreeBSD.org' name='ports@FreeBSD.org'>.
<p>Or you can use the GNU Autoconf style of doing this:
Then, you may use:
<tscreen><verb>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
</verb></tscreen>
Don't forget to add <tt>-DHAVE_SYS_PARAM_H</tt> to the <tt>CFLAGS</tt>
in the Makefile for this method.
Once you have <tt>&lt;sys/param.h&gt;</tt> included, you may use:
<tscreen><verb>
#if (defined(BSD) && (BSD >= 199103))