linux-kernel - [PATCH 1/2] perf build: conditionally add feature check flags for libtrace{event,fs}

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Message-ID: <20240627150606.2224888-1-amadio@gentoo.org>
Date: Thu, 27 Jun 2024 17:06:05 +0200
From: Guilherme Amadio <amadio@...too.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Guilherme Amadio <amadio@...too.org>
Subject: [PATCH 1/2] perf build: conditionally add feature check flags for libtrace{event,fs}

This avoids reported warnings when the packages are not installed.

Fixes: 0f0e1f44569061e3dc590cd0b8cb74d8fd53706b
Signed-off-by: Guilherme Amadio <amadio@...too.org>
---
 tools/perf/Makefile.config | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 81f73f68d256..987b48f242d3 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -182,14 +182,6 @@ endif
 FEATURE_CHECK_CFLAGS-libzstd := $(LIBZSTD_CFLAGS)
 FEATURE_CHECK_LDFLAGS-libzstd := $(LIBZSTD_LDFLAGS)
 
-# 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)
-
-FEATURE_CHECK_CFLAGS-libtracefs := $(shell $(PKG_CONFIG) --cflags libtracefs)
-FEATURE_CHECK_LDFLAGS-libtracefs := $(shell $(PKG_CONFIG) --libs libtracefs)
-
 FEATURE_CHECK_CFLAGS-bpf = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(SRCARCH)/include/uapi -I$(srctree)/tools/include/uapi
 # include ARCH specific config
 -include $(src-perf)/arch/$(SRCARCH)/Makefile
@@ -211,6 +203,17 @@ endif
 ifneq ($(NO_LIBTRACEEVENT),1)
   ifeq ($(call get-executable,$(PKG_CONFIG)),)
   dummy := $(error Error: $(PKG_CONFIG) needed by libtraceevent is missing on this system, please install it)
+  else
+    ifeq ($(shell $(PKG_CONFIG) --exists libtraceevent),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),0)
+      FEATURE_CHECK_CFLAGS-libtracefs := $(shell $(PKG_CONFIG) --cflags libtracefs)
+      FEATURE_CHECK_LDFLAGS-libtracefs := $(shell $(PKG_CONFIG) --libs libtracefs)
+    endif
   endif
 endif
 
-- 
2.45.2