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Makefile: detect pkg-config availability

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Detect whether build system has pkg-config tool, and if not, fallback to
manually specifying -lelf -lz as dependency.

Closes: https://github.com/libbpf/libbpf/issues/885
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
This commit is contained in:
Andrii Nakryiko
2025-03-03 16:58:22 -08:00
committed by Andrii Nakryiko
parent 42a6ef6316
commit 4c893341f5
1 changed files with 4 additions and 1 deletions
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5
src/Makefile
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@@ -26,6 +26,7 @@ endef
$(call allow-override,CC,$(CROSS_COMPILE)cc) $(call allow-override,CC,$(CROSS_COMPILE)cc)
$(call allow-override,LD,$(CROSS_COMPILE)ld) $(call allow-override,LD,$(CROSS_COMPILE)ld)
PKG_CONFIG ?= pkg-config
TOPDIR = .. TOPDIR = ..
@@ -41,10 +42,12 @@ ALL_CFLAGS += $(CFLAGS) \
$(EXTRA_CFLAGS) $(EXTRA_CFLAGS)
ALL_LDFLAGS += $(LDFLAGS) $(EXTRA_LDFLAGS) ALL_LDFLAGS += $(LDFLAGS) $(EXTRA_LDFLAGS)
ifeq ($(shell command -v $(PKG_CONFIG) 2> /dev/null),)
NO_PKG_CONFIG := 1
endif
ifdef NO_PKG_CONFIG ifdef NO_PKG_CONFIG
ALL_LDFLAGS += -lelf -lz ALL_LDFLAGS += -lelf -lz
else else
PKG_CONFIG ?= pkg-config
ALL_CFLAGS += $(shell $(PKG_CONFIG) --cflags libelf zlib) ALL_CFLAGS += $(shell $(PKG_CONFIG) --cflags libelf zlib)
ALL_LDFLAGS += $(shell $(PKG_CONFIG) --libs libelf zlib) ALL_LDFLAGS += $(shell $(PKG_CONFIG) --libs libelf zlib)
endif endif