Convert CHECK to SEARCH to avoid unnecessarily linking in new libs

[Allan Clark]

Hi;
CVS delta 1.147 -> 1.148 includes un-dnl-ing some AC_CHECK_LIBS for USL/SVR4
-derivative Unix environments.

Note that the act of CHECK_LIBS (main) -- which is used to avoid having to
give an entry point/label -- is also replaced by the actual name of an entry
point.

For details, see also:

http://www.gnu.org/software/autoconf/manual/html_node/Libraries.html


The following change converts this Solaris edit to a SEARCH rather than a
CHECK, which works on all platforms, and only adds additional librarires if
the mentioned linker entry points are not already valid in the current list
of libraries:


--- configure.in.solaris 2009-09-30 00:48:17.000000000 +0100
+++ configure.in 2009-09-30 00:51:37.000000000 +0100
@@ -101,9 +101,8 @@


 dnl Checks for library functions.
-AC_CHECK_LIB(nsl,main,SOCKETLIBS="$SOCKETLIBS -lnsl")
-AC_CHECK_LIB(socket,socket,SOCKETLIBS="$SOCKETLIBS -lsocket")
-AC_SUBST(SOCKETLIBS)
+AC_SEARCH_LIBS([getservbyname],[nsl])
+AC_SEARCH_LIBS([connect],[socket])
 AC_CHECK_FUNCS(initgroups setenv strdup strstr strtoul unsetenv)

 AC_MSG_CHECKING(for type of socket size)



Note: this also drops the need for "SOCKETLIBS" tracking.  Libs add the nsl
(NameServices lib) and socket (yeah, socket) libraries only if the
pre-existing libraries (libc, libC, et al) don't already provde the lib.

This check is really intended for the merge-point where sockets moved from
being environmental things to in-kernel things, and not all executables
wanted to link with sockets included by default.


Please, someone on Solaris, consider this change, and check for me.

Allan


-- 
allanc at chickenandporn.com  "金鱼" http://linkedin.com/in/goldfish
Sent from Manchester, Eng, United Kingdom
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