[ng] am: prefer pattern rules over old-fashioned suffix rules

The use of pattern rules is cleaner, safer, and vouched for in the
GNU make manual itself.  Moreover, it will allow us to obtain some
simplifications in the automake script and the documentation in
future changes.

* lib/am/texinfos.am: Turn this suffix rules into pattern rules.
* lib/am/texibuild.am: Likewise.
* lib/am/depend2.am: Likewise.
* lib/am/yacc.am: Likewise.
* lib/am/lex.am: Likewise.
* lib/am/lang-compile.am: Likewise.  Also, since we are at it, remove
extra blank lines and quote 'like this' rather than `like this'.
* t/ext.sh: Adjust.
* t/objc-basic.sh: Likewise.
* t/objcxx-basic.sh: Likewise.
* t/txinfo6.sh: Likewise.
* t/suffix.sh: Likewise.
* t/suffix2.sh: Likewise.  Also, define a dummy LIBTOOL in Makefile.am
instead of requiring the libtool macros.
* t/cxx.sh: Remove as obsolete.
* t/nodep.sh: Likewise.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/t/ext.sh b/t/ext.sh
index 08643ac26..02ceab598 100755
--- a/t/ext.sh
+++ b/t/ext.sh
@@ -34,13 +34,11 @@ END
 $ACLOCAL
 $AUTOMAKE
 
-for ext in f for f90 f95 F F90 F95 r m mm upc
-do
-   # Some versions of the BSD shell wrongly exit when 'set -e' is active
-   # if the last command within a compound statement fails and is guarded
-   # by an && only.  So we play safe and use the following idiom, instead
-   # of the apparently simpler 'grep ... && Exit 1'.
-   if grep "^$ext\.o:" Makefile.in; then Exit 1; else :; fi
-   grep "^\.$ext\.o:" Makefile.in
+$FGREP '%.o' Makefile.in  # For debugging.
+
+for ext in f for f90 f95 F F90 F95 r m mm upc; do
+   grep "%.*: %$ext" Makefile.in && Exit 1
+   grep "^%\.o: %\.$ext$" Makefile.in
 done
-Exit 0
+
+: