compile: don't place built object files in $(srcdir), ever ...

... even when a source file is specified as '$(srdir)/foo.c' or
'$(top_srcdir)/bar.c'. And ditto for dependency-tracking makefile
fragments (those under '.deps' directories).

Such issues used to occur when the 'subdir-objects' option was given.

This change should fix the second and last part of automake bug#13928.
See also bug#16375 and bug#15293.

* NEWS: Update.
* bin/automake.in (handle_single_transform): Make sure object files
and dependency-tracking makefile fragments coming from source like
'$(srcdir)/foo.c' and '$(top_srcdir)/bar.c' are placed respectively
under $(builddir) and $(top_builddir).
* t/subobj-vpath-pr13928.sh: Enhance to expose even more aspects
of the bug we've just fixed.
* t/subobj-pr13928-more-langs.sh: New test, similar to the one above,
but with non-C languages as well.
* t/list-of-tests.mk (XFAIL_TESTS): Remove 'subobj-vpath-pr13928.sh',
it's now supposed to pass.
(handwritten_TESTS): Add 'subobj-pr13928-more-langs.sh'.

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

5 files changed, 269 insertions, 31 deletions

diff --git a/NEWS b/NEWS
index 226f76c66..88597e300 100644
--- a/NEWS
+++ b/NEWS
@@ -67,8 +67,8 @@ New in 1.16:
 * Bugs fixed:
 
   - Automatic dependency tracking has been fixed to work also when the
-    subdir-object option is used and some 'foo_SOURCES' definition contains
-    unexpanded references to make variables, as in, e.g.:
+    'subdir-object' option is used and some 'foo_SOURCES' definition
+    contains unexpanded references to make variables, as in, e.g.:
 
         a_src = sources/libs/aaa
         b_src = sources/bbb
@@ -78,7 +78,7 @@ New in 1.16:
     tracking information will be correctly placed under the directories
     named 'sources/libs/aaa/.deps' and 'sources/bbb/.deps', rather than
     mistakenly under directories named (literally!) '$(src_a)/.deps' and
-    '$(src_b)/.deps' (this was automake bug#13928).
+    '$(src_b)/.deps' (this was the first part of automake bug#13928).
 
     Notice that in order to fix this bug we had to slightly change the
     semantics of how config.status bootstraps the makefile fragments
@@ -88,6 +88,21 @@ New in 1.16:
     using a private target that is only meant to bootstrap the required
     makefile fragments.
 
+  - The 'subdir-object' option no longer causes object files corresponding
+    to source files specified with an explicit '$(srcdir)' component to be
+    placed in the source tree rather than in the build tree.
+
+    For example, if Makefile.am contains:
+
+        AUTOMAKE_OPTIONS = subdir-objects
+        foo_SOURCES = $(srcdir)/foo.c $(srcdir)/s/bar.c $(top_srcdir)/baz.c
+
+    then "make all" will create 'foo.o' and 's/bar.o' in $(builddir) rather
+    than in $(srcdir), and will create 'baz.o' in $(top_builddir) rather
+    than in $(top_srcdir).
+
+    This was the second part of automake bug#13928.
+
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 New in 1.15:
diff --git a/bin/automake.in b/bin/automake.in
index 681b3d2a5..dd828da62 100644
--- a/bin/automake.in
+++ b/bin/automake.in
@@ -1617,9 +1617,9 @@ sub handle_single_transform
 	my $renamed = 0;
 	my ($linker, $object);
 
-	# This records whether we've seen a derived source file (e.g.
-	# yacc output).
-	my $derived_source = 0;
+        # This records whether we've seen a derived source file (e.g., yacc
+        # or lex output).
+        my $derived_source;
 
 	# This holds the 'aggregate context' of the file we are
 	# currently examining.  If the file is compiled with
@@ -1667,17 +1667,36 @@ sub handle_single_transform
 	    # Now extract linker and other info.
 	    $linker = $lang->linker;
 
-	    my $this_obj_ext;
-	    if (defined $source_extension)
-	    {
-		$this_obj_ext = $source_extension;
-		$derived_source = 1;
-	    }
-	    else
-	    {
-		$this_obj_ext = $obj;
-	    }
-	    $object = $base . $this_obj_ext;
+            my $this_obj_ext;
+            if (defined $source_extension)
+              {
+                $this_obj_ext = $source_extension;
+                $derived_source = 1;
+              }
+            else
+              {
+                $this_obj_ext = $obj;
+                $derived_source = 0;
+                # Don't ever place built object files in $(srcdir),
+                # even when sources are specified explicitly as (say)
+                # '$(srcdir)/foo.c' or '$(top_srcdir)/foo.c'.
+                # See automake bug#13928.
+                my @d = split '/', $directory;
+                if (@d > 0 && option 'subdir-objects')
+                  {
+                    my $d = $d[0];
+                    if ($d eq '$(srcdir)' or $d eq '${srcdir}')
+                      {
+                        shift @d;
+                      }
+                    elsif ($d eq '$(top_srcdir)' or $d eq '${top_srcdir}')
+                      {
+                        $d[0] = '$(top_builddir)';
+                      }
+                    $directory = join '/', @d;
+                  }
+              }
+            $object = $base . $this_obj_ext;
 
 	    if ($have_per_exec_flags)
 	    {
@@ -1710,8 +1729,7 @@ sub handle_single_transform
 		$renamed = 1;
 	    }
 
-	    # If rewrite said it was ok, put the object into a
-	    # subdir.
+	    # If rewrite said it was ok, put the object into a subdir.
 	    if ($directory ne '')
 	    {
               if ($r == LANG_SUBDIR)
diff --git a/t/list-of-tests.mk b/t/list-of-tests.mk
index 862bb29d2..80d0f0864 100644
--- a/t/list-of-tests.mk
+++ b/t/list-of-tests.mk
@@ -41,7 +41,6 @@ t/java-nobase.sh \
 t/objext-pr10128.sh \
 t/remake-timing-bug-pr8365.sh \
 t/lex-subobj-nodep.sh \
-t/subobj-vpath-pr13928.sh \
 t/remake-am-pr10111.sh \
 t/remake-m4-pr10111.sh \
 $(perl_fake_XFAIL_TESTS)
@@ -1063,6 +1062,7 @@ t/subobj-clean-pr10697.sh \
 t/subobj-clean-lt-pr10697.sh \
 t/subobj-indir-pr13928.sh \
 t/subobj-vpath-pr13928.sh \
+t/subobj-pr13928-more-langs.sh \
 t/subpkg.sh \
 t/subpkg2.sh \
 t/subpkg3.sh \
diff --git a/t/subobj-pr13928-more-langs.sh b/t/subobj-pr13928-more-langs.sh
new file mode 100644
index 000000000..323e24899
--- /dev/null
+++ b/t/subobj-pr13928-more-langs.sh
@@ -0,0 +1,138 @@
+#! /bin/sh
+# Copyright (C) 2015 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Expose part of automake bug#13928, also for non-C languages: if the
+# subdir-objects option is in use and a source file is listed in a
+# _SOURCES variable with a leading $(srcdir) component, Automake will
+# generate a Makefile that tries to create the corresponding object
+# file in $(srcdir) as well.
+
+required='cc c++ fortran77 fortran'
+. test-init.sh
+
+cat >> configure.ac <<'END'
+AC_PROG_CC
+AC_PROG_CXX
+AC_PROG_F77
+AC_PROG_FC
+AM_CONDITIONAL([OBVIOUS], [:])
+AC_CONFIG_FILES([sub/Makefile])
+AC_OUTPUT
+END
+
+cat > Makefile.am <<'END'
+AUTOMAKE_OPTIONS = subdir-objects
+SUBDIRS = sub
+
+LESS = m/o/r/e
+
+noinst_PROGRAMS = test test2
+test_SOURCES = $(srcdir)/test.f90
+
+test2_SOURCES = $(indir)
+
+indir = ${indir2} $(empty)
+indir2 =
+if OBVIOUS
+indir2 += ${srcdir}/$(LESS)///test.f
+else
+endif
+
+test-objs:
+	ls -la @srcdir@ .
+        :
+	test ! -f @srcdir@/test.$(OBJEXT)
+	test -f test.$(OBJEXT)
+	test ! -f @srcdir@/m/o/r/e/test.$(OBJEXT)
+	test -f m/o/r/e/test.$(OBJEXT)
+        :
+	test ! -f @srcdir@/bar.$(OBJEXT)
+	test -f bar.$(OBJEXT)
+	test ! -f @srcdir@/baz.$(OBJEXT)
+	test -f baz.$(OBJEXT)
+        :
+	test ! -d @srcdir@/$(DEPDIR)
+	test ! -d @srcdir@/m/o/r/e/$(DEPDIR)
+	test -d $(DEPDIR)
+	test -d m/o/r/e/$(DEPDIR)
+
+check-local: test-objs
+END
+
+mkdir sub
+cat > sub/Makefile.am <<'END'
+AUTOMAKE_OPTIONS = subdir-objects
+bin_PROGRAMS = foo
+foo = baz
+foo_SOURCES = foo.h \
+	      $(top_srcdir)/bar.cc \
+              ${top_srcdir}/$(foo).c
+END
+
+
+$ACLOCAL
+$AUTOCONF
+$AUTOMAKE -a
+
+mkfiles='Makefile.in sub/Makefile.in'
+$EGREP '(test|ba[rz])\.|DEPDIR|dirstamp|srcdir' $mkfiles # For debugging.
+$EGREP '\$.(top_)?srcdir./(test|ba[rz]|\$.foo.)\.[o$]' $mkfiles && exit 1
+$FGREP '\$.(top_)?srcdir./.*$(am__dirstamp)' $mkfiles && exit 1
+$FGREP '\$.(top_)?srcdir./.*$(DEPDIR)' $mkfiles && exit 1
+
+cat > test.f90 <<'EOF'
+      program foo
+      stop
+      end
+EOF
+
+mkdir -p m/o/r/e
+cp test.f90 m/o/r/e/test.f
+
+cat > sub/foo.h <<'END'
+#ifdef __cplusplus
+extern "C"
+#endif
+int foo (void);
+END
+
+cat > bar.cc <<'END'
+#include "foo.h"
+#include <iostream>
+int main (void)
+{
+  std::cout << "OK!" << "\n";
+  return foo ();
+}
+END
+
+cat > baz.c <<'END'
+#include "foo.h"
+int foo (void)
+{
+  return 0;
+}
+END
+
+mkdir build
+cd build
+../configure
+
+$MAKE
+$MAKE test-objs
+$MAKE distcheck
+
+:
diff --git a/t/subobj-vpath-pr13928.sh b/t/subobj-vpath-pr13928.sh
index 265832b4f..a7db9d8ad 100644
--- a/t/subobj-vpath-pr13928.sh
+++ b/t/subobj-vpath-pr13928.sh
@@ -22,39 +22,106 @@
 required=cc
 . test-init.sh
 
-cat >> configure.ac << 'END'
+cat >> configure.ac <<'END'
 AC_PROG_CC
 AM_PROG_CC_C_O
+AM_CONDITIONAL([OBVIOUS], [:])
+AC_CONFIG_FILES([sub/Makefile])
 AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = subdir-objects
-noinst_PROGRAMS = test
+SUBDIRS = sub
+
+LESS = more
+
+noinst_PROGRAMS = test test2
 test_SOURCES = $(srcdir)/test.c
+
+test2_SOURCES = $(indir)
+
+indir =
+if OBVIOUS
+indir += ${srcdir}/$(LESS)/test.c
+else
+endif
+
 test-objs:
-	test ! -f '@srcdir@/test.$(OBJEXT)'
+	ls -la @srcdir@ .
+        :
+	test ! -f @srcdir@/test.$(OBJEXT)
 	test -f test.$(OBJEXT)
+	test ! -f @srcdir@/more/test.$(OBJEXT)
+	test -f more/test.$(OBJEXT)
+        :
+	test ! -f @srcdir@/bar.$(OBJEXT)
+	test -f bar.$(OBJEXT)
+	test ! -f @srcdir@/baz.$(OBJEXT)
+	test -f baz.$(OBJEXT)
+        :
+	test ! -d @srcdir@/$(DEPDIR)
+	test ! -d @srcdir@/more/$(DEPDIR)
+	test -d $(DEPDIR)
+	test -d more/$(DEPDIR)
+
+check-local: test-objs
+END
+
+mkdir sub
+cat > sub/Makefile.am <<'END'
+AUTOMAKE_OPTIONS = subdir-objects
+bin_PROGRAMS = foo
+foo_SOURCES = foo.h \
+	      $(top_srcdir)/bar.c \
+              ${top_srcdir}/baz.c
+END
+
+
+$ACLOCAL
+$AUTOCONF
+$AUTOMAKE -a
+
+mkfiles='Makefile.in sub/Makefile.in'
+$EGREP '(test|ba[rz])\.|DEPDIR|dirstamp|srcdir' $mkfiles # For debugging.
+$EGREP '\$.(top_)?srcdir./(test|ba[rz])\.[o$]' $mkfiles && exit 1
+$FGREP '\$.(top_)?srcdir./.*$(am__dirstamp)' $mkfiles && exit 1
+$FGREP '\$.(top_)?srcdir./.*$(DEPDIR)' $mkfiles && exit 1
+
+cat > test.c <<'END'
+int main (void)
+{
+  return 0;
+}
 END
 
-$ACLOCAL && $AUTOCONF && $AUTOMAKE -a || fatal_ "autotools failed"
+mkdir more
+cp test.c more/test.c
 
-$EGREP 'test\.|DEPDIR|dirstamp|srcdir' Makefile.in || : # For debugging.
-$EGREP '\$.srcdir./test\.[o$]' Makefile.in && exit 1
-$FGREP '$(srcdir)/$(am__dirstamp)' Makefile.in && exit 1
-$FGREP '$(srcdir)/$(DEPDIR)' Makefile.in && exit 1
+echo 'int foo (void);' > sub/foo.h
 
-cat > test.c << 'END'
+cat > bar.c <<'END'
+#include "foo.h"
 int main (void)
 {
+  return foo ();
+}
+END
+
+cat > baz.c <<'END'
+#include "foo.h"
+int foo (void)
+{
   return 0;
 }
 END
 
-mkdir build && cd build || fatal "preparation of build directory failed"
-../configure || fatal_ "./configure failed"
+mkdir build
+cd build
+../configure
 
 $MAKE
 $MAKE test-objs
+$MAKE distcheck
 
 :