libbpf: make libbpf.map source of truth for libbpf version

[linux-2.6-microblaze.git] / tools / lib / bpf / Makefile

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 9312066..148a271 100644 (file)
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -1,9 +1,10 @@
 # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
 # Most of this file is copied from tools/lib/traceevent/Makefile
 
-BPF_VERSION = 0
-BPF_PATCHLEVEL = 0
-BPF_EXTRAVERSION = 4
+LIBBPF_VERSION := $(shell \
+       grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
+       sort -rV | head -n1 | cut -d'_' -f2)
+LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
 
 MAKEFLAGS += --no-print-directory
 
@@ -79,15 +80,9 @@ export prefix libdir src obj
 libdir_SQ = $(subst ','\'',$(libdir))
 libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
 
-VERSION                = $(BPF_VERSION)
-PATCHLEVEL     = $(BPF_PATCHLEVEL)
-EXTRAVERSION   = $(BPF_EXTRAVERSION)
-
 OBJ            = $@
 N              =
 
-LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
-
 LIB_TARGET     = libbpf.a libbpf.so.$(LIBBPF_VERSION)
 LIB_FILE       = libbpf.a libbpf.so*
 PC_FILE                = libbpf.pc
@@ -178,10 +173,10 @@ $(BPF_IN): force elfdep bpfdep
 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 
 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
-       $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
+       $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
                                    -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
        @ln -sf $(@F) $(OUTPUT)libbpf.so
-       @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
+       @ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
 
 $(OUTPUT)libbpf.a: $(BPF_IN)
        $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
@@ -257,7 +252,8 @@ config-clean:
 
 clean:
        $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
-               *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd *.pc LIBBPF-CFLAGS
+               *.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
+               *.pc LIBBPF-CFLAGS
        $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf