[PATCH 6/7] subdirs: don't return false positives for the '-k' option's presence

[Stefano Lattarini]

This change fixes automake bug#12554.

The old implementation of the code descending into $(SUBDIRS)
entries used the following snippet to decide whether make is running
with the '-k' a.k.a. '--keep-going' option, and thus whether a failure
in a subdirectory should prevent the descent in the following ones:

    fail= failcom='exit 1'; \
    for f in x $$MAKEFLAGS; do \
      case $$f in \
        *=* | --[!k]*);; \
        *k*) failcom='fail=yes';; \
      esac; \
    done

It's clear that the second pattern in the 'case' construct could possibly
match false positives, for examples in these two cases:

    make check TESTS="x.test k.test"
    make -I /usr/local/kool-fragments

which are somewhat unusual, but not invalid.  So we need a more resilient
implementation, as we did for the detection of the '-n' flag.

This implementation is now provided by the new private macro
'$(am__make_keepgoing)' (introduced in recent commits); so we can
just us that to fix the bug.

* lib/am/subdirs.am ($(am__recursive_targets)): Use '$(am__make_keepgoing)'
instead of ad-hoc and more brittle checks.
* t/list-of-tests.mk (XFAIL_TESTS): Remove the now-passing test case
't/subdir-keep-going-pr12554.sh'.

Reported-by: Michael Daniels <address@hidden>
Signed-off-by: Stefano Lattarini <address@hidden>
---
 lib/am/subdirs.am  | 13 ++++++-------
 t/list-of-tests.mk |  1 -
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/lib/am/subdirs.am b/lib/am/subdirs.am
index c4c3694..999aa78 100644
--- a/lib/am/subdirs.am
+++ b/lib/am/subdirs.am
@@ -39,13 +39,12 @@ AM_RECURSIVE_TARGETS += $(am__recursive_targets:-recursive=)
 $(am__recursive_targets):
 ## Using $failcom allows "-k" to keep its natural meaning when running a
 ## recursive rule.
-       @fail= failcom='exit 1'; \
-       for f in x $$MAKEFLAGS; do \
-         case $$f in \
-           *=* | --[!k]*);; \
-           *k*) failcom='fail=yes';; \
-         esac; \
-       done; \
+       @fail=; \
+       if $(am__make_keepgoing); then \
+         failcom='fail=yes'; \
+       else \
+         failcom='exit 1'; \
+       fi; \
        dot_seen=no; \
        target=`echo $@ | sed s/-recursive//`; \
 ## For distclean and maintainer-clean we make sure to use the full
diff --git a/t/list-of-tests.mk b/t/list-of-tests.mk
index 51a3272..bb9b7a6 100644
--- a/t/list-of-tests.mk
+++ b/t/list-of-tests.mk
@@ -41,7 +41,6 @@ t/remake-timing-bug-pr8365.sh \
 t/lex-subobj-nodep.sh \
 t/remake-am-pr10111.sh \
 t/remake-m4-pr10111.sh \
-t/subdir-keep-going-pr12554.sh \
 $(perl_fake_XFAIL_TESTS)
 
 perl_TESTS = \
-- 
1.8.2.1.610.g562af5b