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Merge pull request #23 from bluca/pkgconfig-elf

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build shared library by default and use pkg-config to get libelf flags
This commit is contained in:
4ast
2019-03-29 11:05:02 -07:00
committed by GitHub
parent e31e1a5a3f 438584bfc2
commit 46936194ed
2 changed files with 27 additions and 6 deletions
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19
README
View File

@@ -19,14 +19,27 @@ successful.
Build
=====
libelf is an internal dependency of libbpf and thus it is required to link
against and must be installed on the system for applications to work.
pkg-config is used by default to find libelf, and the program called can be
overridden with PKG_CONFIG.
If using pkg-config at build time is not desired, it can be disabled by setting
NO_PKG_CONFIG=1 when calling make.
To build static library libbpf.a:
To build both static libbpf.a and shared libbpf.so:
cd src
make
To build both static libbpf.a and shared libbpf.so libraries in directory
To build only static libbpf.a library in directory
build/ and install them together with libbpf headers in a staging directory
root/:
cd src
mkdir build root
BUILD_SHARED=y OBJDIR=build DESTDIR=root make install
BUILD_STATIC_ONLY=y OBJDIR=build DESTDIR=root make install
To build both static libbpf.a and shared libbpf.so against a custom libelf
dependency installed in /build/root/ and install them together with libbpf
headers in a build directory /build/root/:
cd src
PKG_CONFIG_PATH=/build/root/lib64/pkgconfig DESTDIR=/build/root make install

14
src/Makefile
View File

@@ -10,12 +10,20 @@ ifneq ($(FEATURE_REALLOCARRAY),)
ALL_CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
endif
ifdef BUILD_SHARED
ifndef BUILD_STATIC_ONLY
ALL_CFLAGS += -fPIC -fvisibility=hidden
endif
CFLAGS ?= -g -O2 -Werror -Wall
ALL_CFLAGS += $(CFLAGS)
ALL_LDFLAGS += $(LDFLAGS)
ifdef NO_PKG_CONFIG
ALL_LDFLAGS += -lelf
else
PKG_CONFIG ?= pkg-config
ALL_CFLAGS += $(shell $(PKG_CONFIG) --cflags libelf)
ALL_LDFLAGS += $(shell $(PKG_CONFIG) --libs libelf)
endif
OBJDIR ?= .
@@ -23,7 +31,7 @@ OBJS := $(addprefix $(OBJDIR)/,bpf.o btf.o libbpf.o libbpf_errno.o netlink.o \
nlattr.o str_error.o libbpf_probes.o bpf_prog_linfo.o xsk.o)
LIBS := $(OBJDIR)/libbpf.a
ifdef BUILD_SHARED
ifndef BUILD_STATIC_ONLY
LIBS += $(OBJDIR)/libbpf.so
endif
@@ -54,7 +62,7 @@ $(OBJDIR)/libbpf.a: $(OBJS)
$(AR) rcs $@ $^
$(OBJDIR)/libbpf.so: $(OBJS)
$(CC) -shared $(LDFLAGS) $^ -o $@
$(CC) -shared $(ALL_LDFLAGS) $^ -o $@
$(OBJDIR)/libbpf.pc:
sed -e "s|@PREFIX@|$(PREFIX)|" \