tools lib symbol: Add dependency test to install_headers

Compute the headers to be installed from their source headers and make
each have its own build target to install it. Using dependencies
avoids headers being reinstalled and getting a new timestamp which
then causes files that depend on the header to be rebuilt.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nicolas Schier <nicolas@fjasle.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Rix <trix@redhat.com>
Cc: bpf@vger.kernel.org
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20221202045743.2639466-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/lib/symbol/Makefile b/tools/lib/symbol/Makefile
index ea8707b..13d43c6 100644 (file)
--- a/tools/lib/symbol/Makefile
+++ b/tools/lib/symbol/Makefile
@@ -89,10 +89,10 @@ define do_install_mkdir
 endef
 
 define do_install
-       if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
-               $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
-       fi;                                             \
-       $(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+       if [ ! -d '$2' ]; then             \
+               $(INSTALL) -d -m 755 '$2'; \
+       fi;                                \
+       $(INSTALL) $1 $(if $3,-m $3,) '$2'
 endef
 
 install_lib: $(LIBFILE)
@@ -100,9 +100,16 @@ install_lib: $(LIBFILE)
                $(call do_install_mkdir,$(libdir_SQ)); \
                cp -fpR $(LIBFILE) $(DESTDIR)$(libdir_SQ)
 
-install_headers:
-       $(call QUIET_INSTALL, libsymbol_headers) \
-               $(call do_install,kallsyms.h,$(prefix)/include/symbol,644);
+HDRS := kallsyms.h
+INSTALL_HDRS_PFX := $(DESTDIR)$(prefix)/include/symbol
+INSTALL_HDRS := $(addprefix $(INSTALL_HDRS_PFX)/, $(HDRS))
+
+$(INSTALL_HDRS): $(INSTALL_HDRS_PFX)/%.h: %.h
+       $(call QUIET_INSTALL, $@) \
+               $(call do_install,$<,$(INSTALL_HDRS_PFX)/,644)
+
+install_headers: $(INSTALL_HDRS)
+       $(call QUIET_INSTALL, libsymbol_headers)
 
 install: install_lib install_headers