autoconf: use AC_CHECK_TOOL for as and ld

Some platforms use the GNU target triplet as a prefix to the toolchain
utilities (e.g. x86_64-pc-linux-gnu-as) to allow the use of alternative
toolchains, cross-compiling, etc.

The Gentoo Linux distribution has a mode of building packages
(-native-symlinks) where the toolchain utilities only exist as their
prefixed names (e.g. 'as' does not exist, but 'x86_64_pc-linux-gnu-as'
does). This results in configure failing to locate the tools when using
AC_CHECK_PROGS.  (Gentoo uses the --host and --build configure
parameters to specify the prefix names for the tools).

Replace AC_CHECK_PROGS with AC_CHECK_TOOL for the toolchain related
commands 'as' and 'ld'.

AC_CHECK_TOOL works like AC_CHECK_PROGS but it will also look for
the program with a prefix (specified by using configure's --host
parameter).

Note: libtool.m4 runs AC_CHECK_TOOL for ar.

Change-Id: I8005c765d213b7d1d6292a7dd80f10a3d0e2ec68
Reviewed-on: https://gerrit.openafs.org/14544
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

diff --git a/src/cf/osconf.m4 b/src/cf/osconf.m4
index 53ded31..42cddb5 100644 (file)
--- a/src/cf/osconf.m4
+++ b/src/cf/osconf.m4
@@ -25,10 +25,10 @@ PAM_OPTMZ=
 
 dnl standard programs
 AC_PROG_RANLIB
-AC_CHECK_PROGS(AS, as, [false])
+AC_CHECK_TOOL(AS, as, [false])
 AC_CHECK_PROGS(MV, mv, [false])
 AC_CHECK_PROGS(RM, rm, [false])
-AC_CHECK_PROGS(LD, ld, [false])
+AC_CHECK_TOOL(LD, ld, [false])
 AC_CHECK_PROGS(CP, cp, [false])
 AC_CHECK_PROGS(GENCAT, gencat, [false])