ahci: improve and limit spurious interrupt messages, take#3

[powerpc.git] / scripts / Kbuild.include

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 1d6ffb2..f01f8c0 100644 (file)
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -56,6 +56,9 @@ endef
 # gcc support functions
 # See documentation in Documentation/kbuild/makefiles.txt
 
+# output directory for tests below
+TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
+
 # as-option
 # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,)
 
@@ -63,6 +66,15 @@ as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \
             -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \
             else echo "$(2)"; fi ;)
 
+# as-instr
+# Usage: cflags-y += $(call as-instr, instr, option1, option2)
+
+as-instr = $(shell if echo -e "$(1)" | \
+                     $(CC) $(AFLAGS) -c -xassembler - \
+                           -o $(TMPOUT)astest$$$$.out > /dev/null 2>&1; \
+                  then rm $(TMPOUT)astest$$$$.out; echo "$(2)"; \
+                  else echo "$(3)"; fi)
+
 # cc-option
 # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586)
 
@@ -90,10 +102,10 @@ cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \
 
 # ld-option
 # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
-ld-option = $(shell if $(CC) $(1) \
-                            -nostdlib -o ldtest$$$$.out -xc /dev/null \
-             > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \
-            rm -f ldtest$$$$.out)
+ld-option = $(shell if $(CC) $(1) -nostdlib -xc /dev/null \
+                            -o $(TMPOUT)ldtest$$$$.out > /dev/null 2>&1; \
+             then rm $(TMPOUT)ldtest$$$$.out; echo "$(1)"; \
+             else echo "$(2)"; fi)
 
 ###
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
@@ -129,7 +141,7 @@ endif
 
 # echo command. Short version is $(quiet) equals quiet, otherwise full command
 echo-cmd = $(if $($(quiet)cmd_$(1)), \
-       echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
+       echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
 
 # >'< substitution is for echo to work,
 # >$< substitution to preserve $ when reloading .cmd file
@@ -164,3 +176,42 @@ if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
        @set -e;                                                             \
        $(rule_$(1)))
 
+###
+# why - tell why a a target got build
+#       enabled by make V=2
+#       Output (listed in the order they are checked):
+#          (1) - due to target is PHONY
+#          (2) - due to target missing
+#          (3) - due to: file1.h file2.h
+#          (4) - due to command line change
+#          (5) - due to missing .cmd file
+#          (6) - due to target not in $(targets)
+# (1) PHONY targets are always build
+# (2) No target, so we better build it
+# (3) Prerequisite is newer than target
+# (4) The command line stored in the file named dir/.target.cmd
+#     differed from actual command line. This happens when compiler
+#     options changes
+# (5) No dir/.target.cmd file (used to store command line)
+# (6) No dir/.target.cmd file and target not listed in $(targets)
+#     This is a good hint that there is a bug in the kbuild file
+ifeq ($(KBUILD_VERBOSE),2)
+why =                                                                        \
+    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
+        $(if $(wildcard $@),                                                 \
+            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
+                $(if $(arg-check),                                           \
+                    $(if $(cmd_$@),- due to command line change,             \
+                        $(if $(filter $@, $(targets)),                       \
+                            - due to missing .cmd file,                      \
+                            - due to $(notdir $@) not in $$(targets)         \
+                         )                                                   \
+                     )                                                       \
+                 )                                                           \
+             ),                                                              \
+             - due to target missing                                         \
+         )                                                                   \
+     )
+
+echo-why = $(call escsq, $(strip $(why)))
+endif