automake/74: configure code fragment doesn't test requirement in depcomp

[js dot pendry at msdw dot com]

>Number:         74
>Category:       automake
>Synopsis:       configure code fragment doesn't test requirement in depcomp
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    tromey
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 11 01:51:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     js.pendry@msdw.com
>Release:        cvs version of automake
>Organization:
>Environment:
Solaris 2.5, SunPro C++ 4.2/5.0
>Description:
depcomp's -M processing (dashmstdout) has the following
comment:

dashmstdout)
  # Important note: in order to support this mode, a compiler *must*
  # always write the proprocessed file to stdout, regardless of -o,
  # because we must use -o when running libtool.

SunPro C handles this correctly, however SunPro C++
doesn't.  While this is arguably a bug in SunPro C++,
the code fragment in m4/depend.m4 doesn't test for
this requirement.  The test doesn't use the -o option and
the effect is that dashmstdout is selected even though
it doesn't work with -o.

a workaround is attached.  however, this assumes that
-o works everywhere which may also not be a correct
assumption.  a more sophisticated way of doing the
test is needed.
>How-To-Repeat:

>Fix:
RCS file: /cvs/automake/automake/m4/depend.m4,v
retrieving revision 1.2
diff -c -2 -r1.2 depend.m4
*** depend.m4   1999/11/21 21:35:41     1.2
--- depend.m4   2000/06/11 08:30:28
***************
*** 45,49 ****
         source=conftest.c object=conftest.o \
         depfile=conftest.Po tmpdepfile=conftest.TPo \
!        $SHELL $am_depcomp $depcc -c conftest.c 2>/dev/null &&
         grep conftest.h conftest.Po > /dev/null 2>&1; then
        am_cv_[$1]_dependencies_compiler_type="$depmode"
--- 45,49 ----
         source=conftest.c object=conftest.o \
         depfile=conftest.Po tmpdepfile=conftest.TPo \
!        $SHELL $am_depcomp $depcc -c conftest.c -o conftest.o 2>/dev/null &&
         grep conftest.h conftest.Po > /dev/null 2>&1; then
        am_cv_[$1]_dependencies_compiler_type="$depmode"

>Release-Note:
>Audit-Trail:
>Unformatted: