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Makefile: add support for cross compilation

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Support CROSS_COMPILE and EXTRA_CFLAGS/EXTRA_LDFLAGS environments,
to make cross compiling more flexible.

Signed-off-by: Jie Wang <wangjie22@lixiang.com>
This commit is contained in:
wangjie
2022-05-13 13:50:20 +08:00
committed by Andrii Nakryiko
parent eaf9123419
commit 4eb6485c08
1 changed files with 12 additions and 2 deletions
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14
src/Makefile
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@@ -18,6 +18,15 @@ ifneq ($(LIBBPF_MAJMIN_VERSION), $(LIBBPF_MAP_VERSION))
$(error Libbpf release ($(LIBBPF_VERSION)) and map ($(LIBBPF_MAP_VERSION)) versions are out of sync!) $(error Libbpf release ($(LIBBPF_VERSION)) and map ($(LIBBPF_MAP_VERSION)) versions are out of sync!)
endif endif
define allow-override
$(if $(or $(findstring environment,$(origin $(1))),\
$(findstring command line,$(origin $(1)))),,\
$(eval $(1) = $(2)))
endef
$(call allow-override,CC,$(CROSS_COMPILE)cc)
$(call allow-override,LD,$(CROSS_COMPILE)ld)
TOPDIR = .. TOPDIR = ..
INCLUDES := -I. -I$(TOPDIR)/include -I$(TOPDIR)/include/uapi INCLUDES := -I. -I$(TOPDIR)/include -I$(TOPDIR)/include/uapi
@@ -26,8 +35,9 @@ ALL_CFLAGS := $(INCLUDES)
SHARED_CFLAGS += -fPIC -fvisibility=hidden -DSHARED SHARED_CFLAGS += -fPIC -fvisibility=hidden -DSHARED
CFLAGS ?= -g -O2 -Werror -Wall -std=gnu89 CFLAGS ?= -g -O2 -Werror -Wall -std=gnu89
ALL_CFLAGS += $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 ALL_CFLAGS += $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 $(EXTRA_CFLAGS)
ALL_LDFLAGS += $(LDFLAGS) ALL_LDFLAGS += $(LDFLAGS) $(EXTRA_LDFLAGS)
ifdef NO_PKG_CONFIG ifdef NO_PKG_CONFIG
ALL_LDFLAGS += -lelf -lz ALL_LDFLAGS += -lelf -lz
else else