Turn previously auto-generated libbpf_version.h header into a normal
header file. This prevents various tricky Makefile integration issues,
simplifies the overall build process, but also allows to further extend
it with some more versioning-related APIs in the future.
To prevent accidental out-of-sync versions as defined by libbpf.map and
libbpf_version.h, Makefile checks their consistency at build time.
Simultaneously with this change bump libbpf.map to v0.6.
Fixes: 0b46b7550560 ("libbpf: Add LIBBPF_DEPRECATED_SINCE macro for scheduling API deprecations")
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
tools/lib/bpf/.gitignore | 1 -
tools/lib/bpf/Makefile | 32 +++++++++++++++++++++-----------
tools/lib/bpf/libbpf.map | 3 +++
tools/lib/bpf/libbpf_version.h | 9 +++++++++
4 files changed, 33 insertions(+), 12 deletions(-)
create mode 100644 tools/lib/bpf/libbpf_version.h
diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
index 5d4cfac671d5..0da84cb9e66d 100644
--- a/tools/lib/bpf/.gitignore
+++ b/tools/lib/bpf/.gitignore
@@ -1,5 +1,4 @@
# SPDX-License-Identifier: GPL-2.0-only
-libbpf_version.h
libbpf.pc
libbpf.so.*
TAGS
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index dab21e0c7cc2..3f6f8aa3b3a4 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -115,7 +115,7 @@ BPF_IN_SHARED := $(SHARED_OBJDIR)libbpf-in.o
BPF_IN_STATIC := $(STATIC_OBJDIR)libbpf-in.o
VERSION_HDR := $(OUTPUT)libbpf_version.h
BPF_HELPER_DEFS := $(OUTPUT)bpf_helper_defs.h
-BPF_GENERATED := $(BPF_HELPER_DEFS) $(VERSION_HDR)
+BPF_GENERATED := $(BPF_HELPER_DEFS)
LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
@@ -165,12 +165,6 @@ $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
$(QUIET_GEN)$(srctree)/scripts/bpf_doc.py --header \
--file $(srctree)/tools/include/uapi/linux/bpf.h > $(BPF_HELPER_DEFS)
-$(VERSION_HDR): force
- $(QUIET_GEN)echo "/* This file was auto-generated. */" > $@
- @echo "" >> $@
- @echo "#define LIBBPF_MAJOR_VERSION $(LIBBPF_MAJOR_VERSION)" >> $@
- @echo "#define LIBBPF_MINOR_VERSION $(LIBBPF_MINOR_VERSION)" >> $@
-
$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
@@ -189,7 +183,7 @@ $(OUTPUT)libbpf.pc:
-e "s|@VERSION@|$(LIBBPF_VERSION)|" \
< libbpf.pc.template > $@
-check: check_abi
+check: check_abi check_version
check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
@if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \
@@ -215,6 +209,21 @@ check_abi: $(OUTPUT)libbpf.so $(VERSION_SCRIPT)
exit 1; \
fi
+HDR_MAJ_VERSION := $(shell grep -oE '^\#define LIBBPF_MAJOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
+HDR_MIN_VERSION := $(shell grep -oE '^\#define LIBBPF_MINOR_VERSION ([0-9]+)$$' libbpf_version.h | cut -d' ' -f3)
+
+check_version: $(VERSION_SCRIPT) $(VERSION_HDR)
+ @if [ "$(HDR_MAJ_VERSION)" != "$(LIBBPF_MAJOR_VERSION)" ]; then \
+ echo "Error: libbpf major version mismatch detected: " \
+ "'$(HDR_MAJ_VERSION)' != '$(LIBBPF_MAJOR_VERSION)'" >&2; \
+ exit 1; \
+ fi
+ @if [ "$(HDR_MIN_VERSION)" != "$(LIBBPF_MINOR_VERSION)" ]; then \
+ echo "Error: libbpf minor version mismatch detected: " \
+ "'$(HDR_MIN_VERSION)' != '$(LIBBPF_MINOR_VERSION)'" >&2; \
+ exit 1; \
+ fi
+
define do_install_mkdir
if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
@@ -234,8 +243,9 @@ install_lib: all_cmd
cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
INSTALL_HEADERS = bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \
- bpf_helpers.h $(BPF_GENERATED) bpf_tracing.h \
- bpf_endian.h bpf_core_read.h skel_internal.h
+ bpf_helpers.h $(BPF_GENERATED) bpf_tracing.h \
+ bpf_endian.h bpf_core_read.h skel_internal.h \
+ libbpf_version.h
install_headers: $(BPF_GENERATED)
$(call QUIET_INSTALL, headers) \
@@ -255,7 +265,7 @@ clean:
$(addprefix $(OUTPUT), \
*.o *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) *.pc)
-PHONY += force cscope tags
+PHONY += force cscope tags check check_abi check_version
force:
cscope:
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index bbc53bb25f68..78ea62c9346f 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -386,3 +386,6 @@ LIBBPF_0.5.0 {
btf_dump__dump_type_data;
libbpf_set_strict_mode;
} LIBBPF_0.4.0;
+
+LIBBPF_0.6.0 {
+} LIBBPF_0.5.0;
diff --git a/tools/lib/bpf/libbpf_version.h b/tools/lib/bpf/libbpf_version.h
new file mode 100644
index 000000000000..dd56d76f291c
--- /dev/null
+++ b/tools/lib/bpf/libbpf_version.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* Copyright (C) 2021 Facebook */
+#ifndef __LIBBPF_VERSION_H
+#define __LIBBPF_VERSION_H
+
+#define LIBBPF_MAJOR_VERSION 0
+#define LIBBPF_MINOR_VERSION 6
+
+#endif /* __LIBBPF_VERSION_H */
--
2.30.2
