build: add DTrace detection for autotools

.gitignore

@@ -33,7 +33,7 @@ Makefile
 Makefile.in
 
 # Generated by dtrace(1) when doing an in-tree build.
-/src/unix/uv-dtrace.h
+/include/uv-dtrace.h
 
 /out/
 /build/gyp

Makefile.am

@@ -20,6 +20,8 @@ AM_CPPFLAGS = -I$(top_srcdir)/include \
 
 include_HEADERS=include/uv.h include/uv-unix.h
 
+CLEANFILES =
+
 lib_LTLIBRARIES = libuv.la
 libuv_la_CFLAGS = @CFLAGS@
 libuv_la_LDFLAGS = -no-undefined -version-info 11:0:0
@@ -189,3 +191,33 @@ include_HEADERS += include/uv-sunos.h
 libuv_la_CFLAGS += -D__EXTENSIONS__ -D_XOPEN_SOURCE=500
 libuv_la_SOURCES += src/unix/sunos.c
 endif
+
+if HAVE_DTRACE
+BUILT_SOURCES = include/uv-dtrace.h
+CLEANFILES += include/uv-dtrace.h
+endif
+
+if DTRACE_NEEDS_OBJECTS
+libuv_la_SOURCES += src/unix/uv-dtrace.d
+libuv_la_DEPENDENCIES = src/unix/uv-dtrace.o
+libuv_la_LIBADD = src/unix/uv-dtrace.lo
+CLEANFILES += src/unix/uv-dtrace.o src/unix/uv-dtrace.lo
+endif
+
+SUFFIXES = .d
+
+include/uv-dtrace.h: src/unix/uv-dtrace.d
+	$(AM_V_GEN)$(DTRACE) $(DTRACEFLAGS) -h -xnolibs -s $< -o $@
+
+src/unix/uv-dtrace.o: src/unix/uv-dtrace.d ${libuv_la_OBJECTS}
+
+.d.o:
+	$(AM_V_GEN)$(DTRACE) $(DTRACEFLAGS) -G -o $@ -s $< \
+		`grep '^pic_object' ${top_builddir}/*.lo | cut -f 2 -d\'`
+	$(AM_V_GEN)printf %s\\n \
+		'# $(patsubst %.o, %.lo, $@) - a libtool object file' \
+		'# Generated by libtool (GNU libtool) 2.4' \
+		'# libtool wants a .lo not a .o' \
+		"pic_object='uv-dtrace.o'" \
+		"non_pic_object='uv-dtrace.o'" \
+	> $(patsubst %.o, %.lo, $@)

autogen.sh

@@ -20,6 +20,6 @@ fi
 
 set -ex
 ${LIBTOOLIZE:-libtoolize}
-${ACLOCAL:-aclocal}
+${ACLOCAL:-aclocal -I m4}
 ${AUTOCONF:-autoconf}
 ${AUTOMAKE:-automake} --add-missing

configure.ac

@@ -42,5 +42,6 @@ AM_CONDITIONAL([LINUX],   [AS_CASE([$host_os], [linux*],   [true], [false])])
 AM_CONDITIONAL([NETBSD],  [AS_CASE([$host_os], [netbsd*],  [true], [false])])
 AM_CONDITIONAL([OPENBSD], [AS_CASE([$host_os], [openbsd*], [true], [false])])
 AM_CONDITIONAL([SUNOS],   [AS_CASE([$host_os], [solaris*], [true], [false])])
+PANDORA_ENABLE_DTRACE
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT

m4/dtrace.m4

@@ -0,0 +1,58 @@
+dnl  Copyright (C) 2009 Sun Microsystems
+dnl This file is free software; Sun Microsystems
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl ---------------------------------------------------------------------------
+dnl Macro: PANDORA_ENABLE_DTRACE
+dnl ---------------------------------------------------------------------------
+AC_DEFUN([PANDORA_ENABLE_DTRACE],[
+  AC_ARG_ENABLE([dtrace],
+    [AS_HELP_STRING([--disable-dtrace],
+            [enable DTrace USDT probes. @<:@default=yes@:>@])],
+    [ac_cv_enable_dtrace="$enableval"],
+    [ac_cv_enable_dtrace="yes"])
+
+  AS_IF([test "$ac_cv_enable_dtrace" = "yes"],[
+    AC_CHECK_PROGS([DTRACE], [dtrace])
+    AS_IF([test "x$ac_cv_prog_DTRACE" = "xdtrace"],[
+
+      AC_CACHE_CHECK([if dtrace works],[ac_cv_dtrace_works],[
+        cat >conftest.d <<_ACEOF
+provider Example {
+  probe increment(int);
+};
+_ACEOF
+        $DTRACE -h -o conftest.h -s conftest.d 2>/dev/zero
+        AS_IF([test $? -eq 0],[ac_cv_dtrace_works=yes],
+          [ac_cv_dtrace_works=no])
+        rm -f conftest.h conftest.d
+      ])
+      AS_IF([test "x$ac_cv_dtrace_works" = "xyes"],[
+        AC_DEFINE([HAVE_DTRACE], [1], [Enables DTRACE Support])
+      ])
+      AC_CACHE_CHECK([if dtrace should instrument object files],
+        [ac_cv_dtrace_needs_objects],[
+          dnl DTrace on MacOSX does not use -G option
+          cat >conftest.d <<_ACEOF
+provider Example {
+  probe increment(int);
+};
+_ACEOF
+          $DTRACE -G -o conftest.d.o -s conftest.d 2>/dev/zero
+          AS_IF([test $? -eq 0],[ac_cv_dtrace_needs_objects=yes],
+            [ac_cv_dtrace_needs_objects=no])
+          rm -f conftest.d.o conftest.d
+      ])
+      AC_SUBST(DTRACEFLAGS) dnl TODO: test for -G on OSX
+      ac_cv_have_dtrace=yes
+    ])])
+
+AM_CONDITIONAL([HAVE_DTRACE], [test "x$ac_cv_dtrace_works" = "xyes"])
+AM_CONDITIONAL([DTRACE_NEEDS_OBJECTS],
+               [test "x$ac_cv_dtrace_needs_objects" = "xyes"])
+
+])
+dnl ---------------------------------------------------------------------------
+dnl End Macro: PANDORA_ENABLE_DTRACE
+dnl ---------------------------------------------------------------------------