[PATCH] Enable out-of-tree kernel module compilation with GNU xargs in $PATH

[Richard Yao]

I am working on a port of a Linux kernel module to FreeBSD. I decided to
rebase on FreeBSD 9.1-BETA1. I installed Gentoo Prefix so that I would
be able to work on this port in a more familiar development environment.

Unfortunately, there is an issue where /usr/src/sys/conf/kmod.mk invokes
xargs with -J, which Gentoo Prefix's GNU xargs does not support. I have
written a patch for kmod.mk that will attempt shell substitution in
place of xargs when the current command that relies on xargs fails.

There are probably other ways of addressing this, but I just would like
this to work without requiring a patch to the system sources.

--- /usr/src/sys/conf/kmod.mk.orig      2012-08-02 23:49:09.749192513 -0400
+++ /usr/src/sys/conf/kmod.mk   2012-08-04 08:57:25.719110508 -0400
@@ -217,7 +217,8 @@ ${FULLPROG}: ${OBJS}
        grep -v '^#' < ${EXPORT_SYMS} > export_syms
 .endif
        awk -f ${SYSDIR}/conf/kmod_syms.awk ${.TARGET} \
-           export_syms | xargs -J% ${OBJCOPY} % ${.TARGET}
+           export_syms | xargs -J% ${OBJCOPY} % ${.TARGET} || \
+           ${OBJCOPY} $(awk -f ${SYSDIR}/conf/kmod_syms.awk ${.TARGET} 
export_syms) ${.TARGET}
 .endif
 .endif
 .if !defined(DEBUG_FLAGS) && ${__KLD_SHARED} == no

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