[tip: perf/urgent] libtraceevent: Fix lib installation with O=

[tip-bot2 for Sudip Mukherjee]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     587db8ebdac2c5eb3a8851e16b26f2e2711ab797
Gitweb:        https://git.kernel.org/tip/587db8ebdac2c5eb3a8851e16b26f2e2711ab797
Author:        Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
AuthorDate:    Fri, 15 Nov 2019 11:36:09 
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Mon, 02 Dec 2019 21:58:20 -03:00

libtraceevent: Fix lib installation with O=

When we use 'O=' with make to build libtraceevent in a separate folder
it fails to install libtraceevent.a and libtraceevent.so.1.1.0 with the
error:

  INSTALL  /home/sudip/linux/obj-trace/libtraceevent.a
  INSTALL  /home/sudip/linux/obj-trace/libtraceevent.so.1.1.0

  cp: cannot stat 'libtraceevent.a': No such file or directory
  Makefile:225: recipe for target 'install_lib' failed
  make: *** [install_lib] Error 1

I used the command:

  make O=../../../obj-trace DESTDIR=~/test prefix==/usr  install

It turns out libtraceevent Makefile, even though it builds in a separate
folder, searches for libtraceevent.a and libtraceevent.so.1.1.0 in its
source folder.

So, add the 'OUTPUT' prefix to the source path so that 'make' looks for
the files in the correct place.

Signed-off-by: Sudipm Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Reviewed-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: linux-trace-devel@xxxxxxxxxxxxxxx
Link: http://lore.kernel.org/lkml/20191115113610.21493-1-sudipm.mukherjee@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/lib/traceevent/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
index cbb429f..83446fe 100644
--- a/tools/lib/traceevent/Makefile
+++ b/tools/lib/traceevent/Makefile
@@ -97,6 +97,7 @@ EVENT_PARSE_VERSION = $(EP_VERSION).$(EP_PATCHLEVEL).$(EP_EXTRAVERSION)
 
 LIB_TARGET  = libtraceevent.a libtraceevent.so.$(EVENT_PARSE_VERSION)
 LIB_INSTALL = libtraceevent.a libtraceevent.so*
+LIB_INSTALL := $(addprefix $(OUTPUT),$(LIB_INSTALL))
 
 INCLUDES = -I. -I $(srctree)/tools/include $(CONFIG_INCLUDES)