perf build: Add single target build framework support

Add support to build single targets, like:

 $ make util/map.o    # objects
 $ make util/map.i    # preprocessor
 $ make util/map.s    # assembly

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Tested-by: Will Deacon <will.deacon@arm.com>
Cc: Alexis Berlemont <alexis.berlemont@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-tt10y0dmweq6rjaod937rpb4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
index aced86d2bbf8..b5ded207f49b 100644
--- a/tools/build/Makefile.build
+++ b/tools/build/Makefile.build
@@ -49,6 +49,12 @@ quiet_cmd_mkdir = MKDIR    $(dir $@)
 quiet_cmd_cc_o_c = CC       $@
       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
 
+quiet_cmd_cc_i_c = CPP      $@
+      cmd_cc_i_c = $(CC) $(c_flags) -E -o $@ $<
+
+quiet_cmd_cc_s_c = AS       $@
+      cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
+
 # Link agregate command
 # If there's nothing to link, create empty $@ object.
 quiet_cmd_ld_multi = LD       $@
@@ -64,6 +70,18 @@ $(OUTPUT)%.o: %.S FORCE
         $(call rule_mkdir)
         $(call if_changed_dep,cc_o_c)
 
+$(OUTPUT)%.i: %.c FORCE
+        $(call rule_mkdir)
+        $(call if_changed_dep,cc_i_c)
+
+$(OUTPUT)%.i: %.S FORCE
+        $(call rule_mkdir)
+        $(call if_changed_dep,cc_i_c)
+
+$(OUTPUT)%.s: %.c FORCE
+        $(call rule_mkdir)
+        $(call if_changed_dep,cc_s_c)
+
 # Gather build data:
 #   obj-y        - list of build objects
 #   subdir-y     - list of directories to nest
@@ -100,7 +118,7 @@ FORCE:
 
 # Include all cmd files to get all the dependency rules
 # for all objects included
-targets   := $(wildcard $(sort $(obj-y) $(in-target)))
+targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 
 ifneq ($(cmd_files),)