+ # Each line is of the form 'foo.o: dependent.h',
+ # or 'foo.o: dep1.h dep2.h \', or ' dep3.h dep4.h \'.
+ # Do two passes, one to just change these to
+ # '$object: dependent.h' and one to simply 'dependent.h:'.
+ sed -e "s/^[ $tab][ $tab]*/ /" -e "s,^[^:]*:,$object :," \
+ < "$tmpdepfile" > "$depfile"
+ sed '
+ s/[ '"$tab"'][ '"$tab"']*/ /g
+ s/^ *//
+ s/ *\\*$//
+ s/^[^:]*: *//
+ /^$/d
+ /:$/d
+ s/$/ :/
+ ' < "$tmpdepfile" >> "$depfile"
+ rm -f "$tmpdepfile"
+ ;;
+
+## The order of this option in the case statement is important, since the
+## shell code in configure will try each of these formats in the order
+## listed in this file. A plain '-MD' option would be understood by many
+## compilers, so we must ensure this comes after the gcc and icc options.
+pgcc)
+ # Portland's C compiler understands '-MD'.
+ # Will always output deps to 'file.d' where file is the root name of the
+ # source file under compilation, even if file resides in a subdirectory.
+ # The object file name does not affect the name of the '.d' file.
+ # pgcc 10.2 will output
+ # foo.o: sub/foo.c sub/foo.h
+ # and will wrap long lines using '\' :
+ # foo.o: sub/foo.c ... \
+ # sub/foo.h ... \
+ # ...
+ dir=`echo "$object" | sed -e 's|/[^/]*$|/|'`
+ test "x$dir" = "x$object" && dir=
+ # Use the source, not the object, to determine the base name, since
+ # that's sadly what pgcc will do too.
+ base=`echo "$source" | sed -e 's|^.*/||' -e 's/\.[-_a-zA-Z0-9]*$//'`
+ tmpdepfile="$base.d"
+
+ # For projects that build the same source file twice into different object
+ # files, the pgcc approach of using the *source* file root name can cause
+ # problems in parallel builds. Use a locking strategy to avoid stomping on
+ # the same $tmpdepfile.
+ lockdir="$base.d-lock"
+ trap "echo '$0: caught signal, cleaning up...' >&2; rm -rf $lockdir" 1 2 13 15
+ numtries=100
+ i=$numtries
+ while test $i -gt 0 ; do
+ # mkdir is a portable test-and-set.
+ if mkdir $lockdir 2>/dev/null; then
+ # This process acquired the lock.
+ "$@" -MD
+ stat=$?
+ # Release the lock.
+ rm -rf $lockdir
+ break
+ else
+ ## the lock is being held by a different process,
+ ## wait until the winning process is done or we timeout
+ while test -d $lockdir && test $i -gt 0; do
+ sleep 1
+ i=`expr $i - 1`
+ done
+ fi
+ i=`expr $i - 1`
+ done
+ trap - 1 2 13 15
+ if test $i -le 0; then
+ echo "$0: failed to acquire lock after $numtries attempts" >&2
+ echo "$0: check lockdir '$lockdir'" >&2
+ exit 1
+ fi
+
+ if test $stat -ne 0; then
+ rm -f "$tmpdepfile"
+ exit $stat
+ fi
+ rm -f "$depfile"