Add dependency tracking for Developer Studio 12.6

Author: k0ekk0ek

Diff for: Makefile.in

@@ -11,7 +11,7 @@ HASWELL = @HAVE_HASWELL@
 CC = @CC@
 CPPFLAGS = @CPPFLAGS@ -I$(SOURCE)/include -I$(SOURCE)/src -I.
 CFLAGS = @CFLAGS@
-DEPFLAGS = -MT $@ -MMD -MP -MF $(@:.o=.d)
+DEPFLAGS = @DEPFLAGS@
 VPATH = @srcdir@
 
 SOURCE = @srcdir@

Diff for: configure.ac

@@ -32,6 +32,13 @@ case "$enable_haswell" in
   yes|*) enable_haswell=yes ;;
 esac
 
+# GCC and Clang
+AX_CHECK_COMPILE_FLAG([-MMD],DEPFLAGS="-MMD -MP")
+# Oracle Developer Studio (no -MP)
+AX_CHECK_COMPILE_FLAG([-xMMD],DEPFLAGS="-xMMD")
+
+AC_SUBST([DEPFLAGS])
+
 # Figure out the canonical target architecture.
 AC_CANONICAL_TARGET