[Bug runtime/25266] New: Log configure command output when compiling modules

["craig.ringer at 2ndquadrant dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25266

            Bug ID: 25266
           Summary: Log configure command output when compiling modules
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: craig.ringer at 2ndquadrant dot com
  Target Milestone: ---

The runtime configure commands' output is not logged anywhere. From the
generated Makefile for module builds:

~~~
        @if $(CHECK_BUILD)
$(SYSTEMTAP_RUNTIME)/linux/autoconf-linux-sched_headers.c > /dev/null 2>&1;
then echo "#define STAPCONF_LINUX_SCHED_HEADERS 1"; fi >> $@
~~~

all output is sent to /dev/null .

This made diagnosis rather harder in #25265 

I suggest redirection of stdout to stderr instead, and bracketing it with an
echo. Like

~~~
        @echo Runtime configure test linux/autoconf-linux-sched_headers.c for
STAPCONF_LINUX_SCHED_HEADERS:
        @if $(CHECK_BUILD)
$(SYSTEMTAP_RUNTIME)/linux/autoconf-linux-sched_headers.c 1>&2; then echo
"#define STAPCONF_LINUX_SCHED_HEADERS 1"; echo "yes"; else echo "no"; fi >> $@
~~~

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