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OpenCloudOS-Kernel
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libbpf: Skip re-installing headers file if source is older than target 

The "install_headers" target in libbpf's Makefile would unconditionally
export all API headers to the target directory. When those headers are
installed to compile another application, this means that make always
finds newer dependencies for the source files relying on those headers,
and deduces that the targets should be rebuilt.

Avoid that by making "install_headers" depend on the source header
files, and (re-)install them only when necessary.

Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211007194438.34443-2-quentin@isovalent.com
This commit is contained in:
Quentin Monnet 2021-10-07 20:44:27 +01:00 committed by Andrii Nakryiko
parent 7e3cbd3405
commit b79c2ce3ba
1 changed files with 17 additions and 8 deletions
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25
tools/lib/bpf/Makefile
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@ -241,15 +241,24 @@ install_lib: all_cmd
$(call do_install_mkdir,$(libdir_SQ)); \
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 \
libbpf_version.h
SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h \
bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h \
skel_internal.h libbpf_version.h
GEN_HDRS := $(BPF_GENERATED)
install_headers: $(BPF_GENERATED)
$(call QUIET_INSTALL, headers) \
$(foreach hdr,$(INSTALL_HEADERS), \
$(call do_install,$(hdr),$(prefix)/include/bpf,644);)
INSTALL_PFX := $(DESTDIR)$(prefix)/include/bpf
INSTALL_SRC_HDRS := $(addprefix $(INSTALL_PFX)/, $(SRC_HDRS))
INSTALL_GEN_HDRS := $(addprefix $(INSTALL_PFX)/, $(notdir $(GEN_HDRS)))
$(INSTALL_SRC_HDRS): $(INSTALL_PFX)/%.h: %.h
$(call QUIET_INSTALL, $@) \
$(call do_install,$<,$(prefix)/include/bpf,644)
$(INSTALL_GEN_HDRS): $(INSTALL_PFX)/%.h: $(OUTPUT)%.h
$(call QUIET_INSTALL, $@) \
$(call do_install,$<,$(prefix)/include/bpf,644)
install_headers: $(BPF_GENERATED) $(INSTALL_SRC_HDRS) $(INSTALL_GEN_HDRS)
install_pkgconfig: $(PC_FILE)
$(call QUIET_INSTALL, $(PC_FILE)) \