test defs: more granular overriding of the make program

Before this change, the only way the user could override the make
program used in the automake test cases was to override the $MAKE
variable in the environment.  This had the annoying side effect of
requiring that, whenever a non-default make program was to be used
in the test cases, that same make program had to be used to drive
the execution of the automake testsuite; otherwise, the recursive
make invocations could pick up $MAKE from the environment, and use
that instead of re-executing with the correct make.

So, for example, if one wanted to try how Solaris /usr/ccs/bin/make
behaved in the automake test cases, he couldn't run the testsuite
in parallel mode, because that make lacks support for concurrent
execution of recipes; on fast machines, this easily meant a 4x or
higher slow-down.

Once the problem is clear, the solution is pretty simple: allow
the use of another variable, besides $MAKE, to override the make
program to be used in the test cases.

See also commit `v1.11-1318-g3ceeef4', that introduced a more
general version of this change to the master branch.

* tests/defs.in: Allow the make implementation to be used by the
test cases to be overridden by the `$AM_TESTSUITE_MAKE' variable,
in preference to the `$MAKE' variable.

diff --git a/tests/defs.in b/tests/defs.in
index aa8eb63357434f7018c1e92ca0d4c89a460db99d..0ee53c2ff8746eadc2786a5529c9e539e990c938 100644 (file)
--- a/tests/defs.in
+++ b/tests/defs.in
@@ -95,8 +95,8 @@ PATH_SEPARATOR='@PATH_SEPARATOR@'
 SHELL='@SHELL@'
 export SHELL
 # User can override various tools used.
+MAKE=${AM_TESTSUITE_MAKE-${MAKE-'make'}}
 test -z "$PERL" && PERL='@PERL@'
-test -z "$MAKE" && MAKE=make
 test -z "$AUTOCONF" && AUTOCONF="@am_AUTOCONF@"
 test -z "$AUTOM4TE" && AUTOM4TE="@am_AUTOM4TE@"
 test -z "$AUTORECONF" && AUTORECONF="@am_AUTORECONF@"