[PATCH libffi 1/4] Use a template to pass $CC and $CXX to DejaGNU

["Maciej W. Rozycki" <macro@wdc.com>]

Use an Autoconf template rather an inline piece of scriptery to set 
DejaGNU's $CC_FOR_TARGET and $CXX_FOR_TARGET variables from $CC and $CXX 
respectively, making it easier to maintain and making it take advantage 
of Automake's dependency and rule generation.  Relocate the generated 
`local.exp' file to within testsuite/ so as to make its regeneration 
rule to actually work, i.e. (in testsuite/Makefile.in):

EXTRA_DEJAGNU_SITE_CONFIG = local.exp
site.exp: Makefile $(EXTRA_DEJAGNU_SITE_CONFIG)
	[...]
local.exp: $(top_builddir)/config.status $(srcdir)/local.exp.in
	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@

It wouldn't work if the regeneration rule was placed in the top-level 
Makefile.in, which is what Automake would faithfully do if `local.exp' 
stayed in the top level directory.
---
Hi,

 I think having individual AC_CONFIG_FILES macro invocations for each 
output file or group of files would make this change (and code itself) 
more readable, however it hasn't been done before and I decided not to 
change the style on this occasion.  It may make sense as a follow-up 
clean-up.

  Maciej
---
 Makefile.am            |    3 ---
 configure.ac           |    7 +------
 testsuite/Makefile.am  |    2 +-
 testsuite/local.exp.in |    2 ++
 4 files changed, 4 insertions(+), 10 deletions(-)

libffi-test-cc-for-target-template.diff
Index: libffi/Makefile.am
===================================================================
--- libffi.orig/Makefile.am
+++ libffi/Makefile.am
@@ -23,9 +23,6 @@ EXTRA_DIST = LICENSE ChangeLog.old					\
 	libtool-ldflags libtool-version configure.host README.md        \
 	libffi.map.in LICENSE-BUILDTOOLS msvc_build make_sunver.pl	
 
-# local.exp is generated by configure
-DISTCLEANFILES = local.exp
-
 # Subdir rules rely on $(FLAGS_TO_PASS)
 FLAGS_TO_PASS = $(AM_MAKEFLAGS)
 
Index: libffi/configure.ac
===================================================================
--- libffi.orig/configure.ac
+++ libffi/configure.ac
@@ -56,11 +56,6 @@ if test "x$GCC" = "xyes"; then
   CFLAGS="$CFLAGS -fexceptions"
 fi
 
-cat > local.exp <<EOF
-set CC_FOR_TARGET "$CC"
-set CXX_FOR_TARGET "$CXX"
-EOF
-
 AM_MAINTAINER_MODE
 
 AC_CHECK_HEADERS(sys/mman.h)
@@ -401,7 +396,7 @@ test -d src || mkdir src
 test -d src/$TARGETDIR || mkdir src/$TARGETDIR
 ], [TARGETDIR="$TARGETDIR"])
 
-AC_CONFIG_FILES(include/Makefile include/ffi.h Makefile testsuite/Makefile man/Makefile doc/Makefile libffi.pc)
+AC_CONFIG_FILES(include/Makefile include/ffi.h Makefile testsuite/Makefile testsuite/local.exp man/Makefile doc/Makefile libffi.pc)
 
 AC_OUTPUT
 
Index: libffi/testsuite/Makefile.am
===================================================================
--- libffi.orig/testsuite/Makefile.am
+++ libffi/testsuite/Makefile.am
@@ -2,7 +2,7 @@
 
 AUTOMAKE_OPTIONS = foreign dejagnu
 
-EXTRA_DEJAGNU_SITE_CONFIG=../local.exp
+EXTRA_DEJAGNU_SITE_CONFIG = local.exp
 
 CLEANFILES = *.exe core* *.log *.sum
 
Index: libffi/testsuite/local.exp.in
===================================================================
--- /dev/null
+++ libffi/testsuite/local.exp.in
@@ -0,0 +1,2 @@
+set CC_FOR_TARGET "@CC@"
+set CXX_FOR_TARGET "@CXX@"