gh-137056: Fix DTrace build support on NetBSD (GH-137057)

Author: furkanonder

Makefile.pre.in

@@ -2230,7 +2230,7 @@ Python/frozen.o: $(FROZEN_FILES_OUT)
 # an include guard, so we can't use a pipeline to transform its output.
 Include/pydtrace_probes.h: $(srcdir)/Include/pydtrace.d
 	$(MKDIR_P) Include
-	CC="$(CC)" CFLAGS="$(CFLAGS)" $(DTRACE) $(DFLAGS) -o $@ -h -s $<
+	CC="$(CC)" CFLAGS="$(CFLAGS)" $(DTRACE) $(DFLAGS) -o $@ -h -s $(srcdir)/Include/pydtrace.d
 	: sed in-place edit with POSIX-only tools
 	sed 's/PYTHON_/PyDTrace_/' $@ > [email protected]
 	mv [email protected] $@
@@ -2240,7 +2240,7 @@ Python/gc.o: $(srcdir)/Include/pydtrace.h
 Python/import.o: $(srcdir)/Include/pydtrace.h
 
 Python/pydtrace.o: $(srcdir)/Include/pydtrace.d $(DTRACE_DEPS)
-	CC="$(CC)" CFLAGS="$(CFLAGS)" $(DTRACE) $(DFLAGS) -o $@ -G -s $< $(DTRACE_DEPS)
+	CC="$(CC)" CFLAGS="$(CFLAGS)" $(DTRACE) $(DFLAGS) -o $@ -G -s $(srcdir)/Include/pydtrace.d $(DTRACE_DEPS)
 
 Objects/typeobject.o: Objects/typeslots.inc
 

configure

@@ -5104,16 +5104,33 @@ then
     # linked into the binary. Correspondingly, dtrace(1) is missing the ELF
     # generation flag '-G'. We check for presence of this flag, rather than
     # hardcoding support by OS, in the interest of robustness.
+    #
+    # NetBSD DTrace requires the -x nolibs flag to avoid system library conflicts
+    # and uses header generation for testing instead of object generation.
     AC_CACHE_CHECK([whether DTrace probes require linking],
-        [ac_cv_dtrace_link], [dnl
+        [ac_cv_dtrace_link], [
             ac_cv_dtrace_link=no
             echo 'BEGIN{}' > conftest.d
-            "$DTRACE" $DFLAGS -G -s conftest.d -o conftest.o > /dev/null 2>&1 && \
+            case $host in
+                *netbsd*)
+                    DTRACE_TEST_FLAGS="-x nolibs -h"
+                    ;;
+                *)
+                    DTRACE_TEST_FLAGS="-G"
+                    ;;
+            esac
+            "$DTRACE" $DFLAGS $DTRACE_TEST_FLAGS -s conftest.d -o conftest.o > /dev/null 2>&1 && \
                 ac_cv_dtrace_link=yes
       ])
     if test "$ac_cv_dtrace_link" = "yes"; then
         DTRACE_OBJS="Python/pydtrace.o"
     fi
+    # Set NetBSD-specific DTrace flags in DFLAGS
+    case $host in
+        *netbsd*)
+            DFLAGS="$DFLAGS -x nolibs"
+            ;;
+    esac
 fi
 
 dnl Platform-specific C and header files.