tools build: Allow duplicate objects in the object list
authorJiri Olsa <jolsa@redhat.com>
Wed, 26 Aug 2015 13:01:03 +0000 (15:01 +0200)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Wed, 26 Aug 2015 13:34:58 +0000 (10:34 -0300)
It's sometimes useful to specify the object affiliation to multiple
config options like:

  libperf-$(CONFIG_X86) += tsc.o
  libperf-$(CONFIG_AUXTRACE) += tsc.o

while the object itself is linked only once. Adding the support for this
and ignoring duplicate objects in the object list.

Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20150826130103.GF22670@krava.redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/build/Documentation/Build.txt
tools/build/Makefile.build
tools/build/tests/ex/Build

index 00ad2d608727f644fea93f4594cf4eb9f910160f..aa5e092c4352bad50660f3c262ce9819b70120fc 100644 (file)
@@ -66,6 +66,7 @@ To follow the above example, the user provides following 'Build' files:
   ex/Build:
     ex-y += a.o
     ex-y += b.o
+    ex-y += b.o # duplicates in the lists are allowed
 
     libex-y += c.o
     libex-y += d.o
index 8120af9c0341d5bab3efa7d341eb16e2d57a04e0..0c5f485521d6707786188652cb42a3fb7d23c8e6 100644 (file)
@@ -63,7 +63,7 @@ quiet_cmd_gen = GEN      $@
 # If there's nothing to link, create empty $@ object.
 quiet_cmd_ld_multi = LD       $@
       cmd_ld_multi = $(if $(strip $(obj-y)),\
-                      $(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
+                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
 
 # Build rules
 $(OUTPUT)%.o: %.c FORCE
index 70d876237c5709f36a985c4f8c52a56a063167f7..429c7d4521016283ef81bc1dbd1e9ae93e8f2581 100644 (file)
@@ -1,6 +1,7 @@
 ex-y += ex.o
 ex-y += a.o
 ex-y += b.o
+ex-y += b.o
 ex-y += empty/
 ex-y += empty2/