PR4186: cross-architecture probe building

* main.cxx (main): Add 'a:' and 'B:' options.
* session.h (kbuildflags): New place to store -B args.
* testsuite/systemtap.base/cmd_parse.exp: Test them lightly.
* buildrun.cxx (run_make_cmd): Use "--no-print-directory"
  rather than ">/dev/null" in kbuild invocations.  Pass
  '-a' and '-B' flags along.
* hash.cxx (find_script_hash): Add them.
* NEWS, stap.1.in: Mention this.

1 files changed, 27 insertions, 1 deletions

diff --git a/testsuite/systemtap.base/cmd_parse.exp b/testsuite/systemtap.base/cmd_parse.exp
index 7f5f70d9..8824e6c4 100644
--- a/testsuite/systemtap.base/cmd_parse.exp
+++ b/testsuite/systemtap.base/cmd_parse.exp
@@ -1,5 +1,5 @@
 if {![installtest_p]} {
-    for {set i 0} { $i < 8} {incr i} {
+    for {set i 0} { $i < 16} {incr i} {
         untested cmd_parse$i
     }
     return
@@ -129,3 +129,29 @@ expect {
     eof { fail "cmd_parse14: eof" }
 }
 wait;catch {close}
+
+set uname [exec uname -r]
+spawn sh -c "stap -m do_not_cache_me -B kernelrelease -p4 -e 'probe begin {exit()}'"
+# the \r below is meant to match the "kernelrelease" output, as distinct from
+# any possible auxiliary make verbosity.
+expect {
+    -re "$uname\r" { pass "cmd_parse15" }
+    timeout { fail "cmd_parse15: timeout" }
+    eof { fail "cmd_parse15: eof" }
+}
+wait;catch {close}
+
+set uname [exec uname -m]
+spawn sh -c "stap -m do_not_cache_me -a $uname -p4 -e 'probe begin {exit()}'"
+# the \r below is meant to match the "kernelrelease" output, as distinct from
+# any possible auxiliary make verbosity.
+expect {
+    -re "do_not_cache_me.ko\r" { pass "cmd_parse16" }
+    timeout { fail "cmd_parse16: timeout" }
+    eof { fail "cmd_parse16: eof" }
+}
+wait;catch {close}
+
+
+# NB: when adding extra tests here, increment the ![installtest_p]
+# loop count too at the top.