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From: Hilko Bengen <bengen@debian.org>
Date: Tue, 23 Jul 2019 14:43:21 +0200
Subject: Add --with-ebpf-includes parameter
---
configure.ac | 4 ++++
ebpf/Makefile.am | 3 +--
2 files changed, 5 insertions(+), 2 deletions(-)
--- a/configure.ac
+++ b/configure.ac
@@ -508,7 +508,11 @@
AC_SUBST(LLC)
],
[AC_MSG_ERROR([clang needed to build ebpf files])])
- AC_MSG_CHECKING([libbpf has bpf/bpf_helpers.h])
+ AC_ARG_WITH(ebpf_includes,
+ [ --with-ebpf-includes=DIR include directory for building eBPF programs],
+ [AC_SUBST([ebpf_includes],["$withval"])],
+ [AC_SUBST([ebpf_includes],["/usr/include/${build_alias}"])])
+ AC_MSG_CHECKING([libbpf has bpf/bpf_helpers.h])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[
--- a/ebpf/Makefile.am
+++ b/ebpf/Makefile.am
@@ -4,7 +4,7 @@
if BUILD_EBPF
# Maintaining a local copy of UAPI linux/bpf.h
-BPF_CFLAGS = -Iinclude
+BPF_CFLAGS = -Iinclude -I$(ebpf_includes)
BPF_TARGETS = lb.bpf
BPF_TARGETS += filter.bpf
@@ -19,7 +19,6 @@
$(BPF_TARGETS): %.bpf: %.c
# From C-code to LLVM-IR format suffix .ll (clang -S -emit-llvm)
${CLANG} -Wall $(BPF_CFLAGS) -O2 -g \
- -I/usr/include/$(build_cpu)-$(build_os)/ \
-D__KERNEL__ -D__ASM_SYSREG_H \
-target bpf -S -emit-llvm $< -o ${@:.bpf=.ll}
# From LLVM-IR to BPF-bytecode in ELF-obj file
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