tests: avoid gross inefficiency in "make test"

Do not run a sub-make to set up the environment for each
and every test script.  Instead, run it just once and store
the result in a file.
* tests/check.mk (built_programs): Remove definition.
(.built-programs): New rule to create the temporary file.
(CLEANFILES): Arrange to remove it.
(TESTS_ENVIRONMENT): Simply cat .built-programs, rather than
running the sub-make.
* .gitignore: Ignore it.

diff --git a/.gitignore b/.gitignore
index 7fead3d..138e72a 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -76,6 +76,7 @@
 /stamp-h1
 /tests/*/*.log
 /tests/t?
+/tests/.built-programs
 /tests/test-suite.log
 ID
 Makefile

diff --git a/tests/check.mk b/tests/check.mk
index f931806..b80dce8 100644 (file)
--- a/tests/check.mk
+++ b/tests/check.mk
@@ -40,8 +40,13 @@ vc_exe_in_TESTS: Makefile
 check: vc_exe_in_TESTS
 .PHONY: vc_exe_in_TESTS
 
-built_programs = \
-  (cd $(top_builddir)/src && MAKEFLAGS= $(MAKE) -s built_programs.list)
+CLEANFILES =
+CLEANFILES += .built-programs
+check-am: .built-programs
+.built-programs:
+       $(AM_V_GEN)cd $(top_builddir)/src                               \
+            && MAKEFLAGS= $(MAKE) -s built_programs.list               \
+          > $@-t && mv $@-t $@
 
 # Note that the first lines are statements.  They ensure that environment
 # variables that can perturb tests are unset or set to expected values.
@@ -76,7 +81,7 @@ TESTS_ENVIRONMENT =                           \
   abs_top_builddir='$(abs_top_builddir)'       \
   abs_top_srcdir='$(abs_top_srcdir)'           \
   abs_srcdir='$(abs_srcdir)'                   \
-  built_programs="`$(built_programs)`"         \
+  built_programs="`cat .built-programs`"       \
   host_os=$(host_os)                           \
   host_triplet='$(host_triplet)'               \
   srcdir='$(srcdir)'                           \