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[v2,2/4] perf: Add define for libtraceevent version

Message ID 20210921204839.236840-2-irogers@google.com (mailing list archive)
State Superseded
Headers show
Series [v2,1/4] perf: Enable libtracefs dynamic linking | expand

Commit Message

Ian Rogers Sept. 21, 2021, 8:48 p.m. UTC 
The definition is derived from pkg-config as discussed in:
https://lore.kernel.org/lkml/20210610155915.20a252d3@oasis.local.home/
The definition is computed using expr rather than passed to be computed
in C code, this avoids complications with quote  in the variable
expansions. For example see the target python/perf.so in Makefile.perf.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/Makefile.config | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 00ec900ddbca..2001c315f0db 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1093,6 +1093,12 @@  ifdef LIBTRACEEVENT_DYNAMIC
   $(call feature_check,libtraceevent)
   ifeq ($(feature-libtraceevent), 1)
     EXTLIBS += -ltraceevent
+    LIBTRACEEVENT_VERSION := $(shell $(PKG_CONFIG) --modversion libtraceevent)
+    LIBTRACEEVENT_VERSION_1 := $(word 1, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
+    LIBTRACEEVENT_VERSION_2 := $(word 2, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
+    LIBTRACEEVENT_VERSION_3 := $(word 3, $(subst ., ,$(LIBTRACEEVENT_VERSION)))
+    LIBTRACEEVENT_VERSION_CPP := $(shell expr $(LIBTRACEEVENT_VERSION_1) \* 255 \* 255 + $(LIBTRACEEVENT_VERSION_2) \* 255 + $(LIBTRACEEVENT_VERSION_3))
+    CFLAGS += -DLIBTRACEEVENT_VERSION=$(LIBTRACEEVENT_VERSION_CPP)
   else
     dummy := $(error Error: No libtraceevent devel library found, please install libtraceevent-devel);
   endif