[PATCH v2 3/6] tools: Make pkg-config dependency checks usable by other tools

[Guilherme Amadio]

Other tools, in tools/verification and tools/tracing, make use of
libtraceevent and libtracefs as dependencies. This allows setting
up the feature check flags for them as well.

Signed-off-by: Guilherme Amadio <amadio@xxxxxxxxxx>
---
 tools/build/Makefile.feature | 20 ++++++++++++++++++++
 tools/perf/Makefile.config   | 10 ----------
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 1e2ab148d5db..79a03e034073 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -149,6 +149,26 @@ FEATURE_DISPLAY ?=              \
 #
 FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
 
+#
+# Declare list of feature dependency packages that provide pkg-config files.
+#
+FEATURE_PKG_CONFIG ?=           \
+         libtraceevent          \
+         libtracefs
+
+feature_pkg_config = $(eval $(feature_pkg_config_code))
+define feature_pkg_config_code
+  ifeq ($(shell $(PKG_CONFIG) --exists $(1) 2>&1 1>/dev/null; echo $$?),0)
+    FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1))
+    FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1))
+  endif
+endef
+
+# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
+ifneq ($(PKG_CONFIG),)
+  $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
+endif
+
 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 # If in the future we need per-feature checks/flags for features not
 # mentioned in this list we need to refactor this ;-).
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index ba51ecfca02b..23f2b54d8ee6 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -187,16 +187,6 @@ ifneq ($(NO_LIBTRACEEVENT),1)
   dummy := $(error Error: $(PKG_CONFIG) needed by libtraceevent is missing on this system, please install it)
   endif
 endif
-ifeq ($(shell $(PKG_CONFIG) --exists libtraceevent 2>&1 1>/dev/null; echo $$?),0)
-  # for linking with debug library, run like:
-  # make DEBUG=1 PKG_CONFIG_PATH=/opt/libtraceevent/(lib|lib64)/pkgconfig
-  FEATURE_CHECK_CFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --cflags libtraceevent)
-  FEATURE_CHECK_LDFLAGS-libtraceevent := $(shell $(PKG_CONFIG) --libs libtraceevent)
-endif
-ifeq ($(shell $(PKG_CONFIG) --exists libtracefs 2>&1 1>/dev/null; echo $$?),0)
-  FEATURE_CHECK_CFLAGS-libtracefs := $(shell $(PKG_CONFIG) --cflags libtracefs)
-  FEATURE_CHECK_LDFLAGS-libtracefs := $(shell $(PKG_CONFIG) --libs libtracefs)
-endif
 
 FEATURE_CHECK_CFLAGS-bpf = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(SRCARCH)/include/uapi -I$(srctree)/tools/include/uapi
 # include ARCH specific config
-- 
2.45.2