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tools/perf/build: Fix O=/some/dir perf.o type of targets 

If someone specifies a single target, mixed with O=, the following way:

    hubble:~/tip/tools/perf> make O=/tmp/perf util/stat.o
    BUILD: Doing 'make -j8' parallel build
    gcc  -Wbad-function-cast -Wdeclaration-after-statement -Wformat-security -Wformat-y2k [...]

The build might even fail, if a target depends on other targets:

    hubble:~/tip/tools/perf> make O=/tmp/perf perf.o
    ...
    perf.c: In function ‘handle_options’:
    perf.c:155:21: error: ‘PERF_HTML_PATH’ undeclared (first use in this function)

The correct way to invoke such targets is:

    hubble:~/tip/tools/perf> make O=/tmp/perf /tmp/perf/perf.o
    BUILD: Doing 'make -j8' parallel build
    GEN /tmp/perf/common-cmds.h
    CC /tmp/perf/perf.o

But that's unnecessary typing and it's also easy to mistakenly build into the
source directory.

To fix this remove the generic suffix rules and add redirection to $(OUTPUT)
for the most popular .o targets.

Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-mk0oiukmhgSbrll6chrPkkqr@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2013-10-04 12:14:59 +02:00
parent b102420b50
commit 1f7c645ab4
1 changed files with 15 additions and 1 deletions
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16
tools/perf/Makefile.perf
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@ -576,7 +576,21 @@ $(OUTPUT)perf.o perf.spec \
: $(OUTPUT)PERF-VERSION-FILE
.SUFFIXES:
.SUFFIXES: .o .c .S .s
#
# If a target does not match any of the later rules then prefix it by $(OUTPUT)
# This makes targets like 'make O=/tmp/perf perf.o' work in a natural way.
#
ifneq ($(OUTPUT),)
%.o: $(OUTPUT)%.o
@echo " # Redirected target $@ => $(OUTPUT)$@"
util/%.o: $(OUTPUT)util/%.o
@echo " # Redirected target $@ => $(OUTPUT)util/$@"
bench/%.o: $(OUTPUT)bench/%.o
@echo " # Redirected target $@ => $(OUTPUT)bench/$@"
tests/%.o: $(OUTPUT)tests/%.o
@echo " # Redirected target $@ => $(OUTPUT)tests/$@"
endif
# These two need to be here so that when O= is not used they take precedence
# over the general rule for .o