[PATCH 24/79] libperf: Add build version support

[Jiri Olsa]

Adding shared library version, generating following files:

  $ ll toos/perf/lib/libperf.so*
  libperf.so -> libperf.so.0.0.1
  libperf.so.0 -> libperf.so.0.0.1
  libperf.so.0.0.1

Link: http://lkml.kernel.org/n/tip-d2cnt8qoqc5nxiibvzvuw6ir@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 tools/perf/lib/Makefile    | 20 +++++++++++++++++---
 tools/perf/lib/libperf.map |  4 ++++
 2 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 tools/perf/lib/libperf.map

diff --git a/tools/perf/lib/Makefile b/tools/perf/lib/Makefile
index e6f2eb702aaa..25a6476f8b12 100644
--- a/tools/perf/lib/Makefile
+++ b/tools/perf/lib/Makefile
@@ -1,6 +1,10 @@
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 # Most of this file is copied from tools/lib/bpf/Makefile
 
+LIBPERF_VERSION = 0
+LIBPERF_PATCHLEVEL = 0
+LIBPERF_EXTRAVERSION = 1
+
 MAKEFLAGS += --no-print-directory
 
 ifeq ($(srctree),)
@@ -47,7 +51,13 @@ all:
 export srctree OUTPUT CC LD CFLAGS V
 include $(srctree)/tools/build/Makefile.include
 
-LIBPERF_SO := $(OUTPUT)libperf.so
+VERSION_SCRIPT := libperf.map
+
+PATCHLEVEL    = $(LIBPERF_PATCHLEVEL)
+EXTRAVERSION  = $(LIBPERF_EXTRAVERSION)
+VERSION       = $(LIBPERF_VERSION).$(LIBPERF_PATCHLEVEL).$(LIBPERF_EXTRAVERSION)
+
+LIBPERF_SO := $(OUTPUT)libperf.so.$(VERSION)
 LIBPERF_A  := $(OUTPUT)libperf.a
 LIBPERF_IN := $(OUTPUT)libperf-in.o
 
@@ -58,7 +68,11 @@ $(LIBPERF_A): $(LIBPERF_IN)
 	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBPERF_IN)
 
 $(LIBPERF_SO): $(LIBPERF_IN)
-	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libperf.so $^ -o $@
+	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libperf.so \
+                                    -Wl,--version-script=$(VERSION_SCRIPT) $^ -o $@
+	@ln -sf $(@F) $(OUTPUT)libperf.so
+	@ln -sf $(@F) $(OUTPUT)libperf.so.$(LIBPERF_VERSION)
+
 
 libs: $(LIBPERF_A) $(LIBPERF_SO)
 
@@ -67,7 +81,7 @@ all: fixdep
 
 clean:
 	$(call QUIET_CLEAN, libperf) $(RM) $(LIBPERF_A) \
-                *.o *~ *.a *.so .*.d .*.cmd LIBPERF-CFLAGS
+                *.o *~ *.a *.so *.so.$(VERSION) *.so.$(LIBPERF_VERSION) .*.d .*.cmd LIBPERF-CFLAGS
 
 FORCE:
 
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
new file mode 100644
index 000000000000..a8e913988edf
--- /dev/null
+++ b/tools/perf/lib/libperf.map
@@ -0,0 +1,4 @@
+LIBPERF_0.0.1 {
+	local:
+		*;
+};
-- 
2.21.0