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authorDaniel T. Lee <danieltimlee@gmail.com>2019-04-24 05:24:56 +0900
committerDaniel Borkmann <daniel@iogearbox.net>2019-04-25 23:34:10 +0200
commit32e621e55496a0009f44fe4914cd4a23cade4984 (patch)
treeba506134bf9635f9e5bf0dbd6866040516c5e000 /tools/lib
parent0e33d334df1310d0697f2595833f723e5380359c (diff)
downloadlinux-32e621e55496a0009f44fe4914cd4a23cade4984.tar.bz2
libbpf: fix samples/bpf build failure due to undefined UINT32_MAX
Currently, building bpf samples will cause the following error. ./tools/lib/bpf/bpf.h:132:27: error: 'UINT32_MAX' undeclared here (not in a function) .. #define BPF_LOG_BUF_SIZE (UINT32_MAX >> 8) /* verifier maximum in kernels <= 5.1 */ ^ ./samples/bpf/bpf_load.h:31:25: note: in expansion of macro 'BPF_LOG_BUF_SIZE' extern char bpf_log_buf[BPF_LOG_BUF_SIZE]; ^~~~~~~~~~~~~~~~ Due to commit 4519efa6f8ea ("libbpf: fix BPF_LOG_BUF_SIZE off-by-one error") hard-coded size of BPF_LOG_BUF_SIZE has been replaced with UINT32_MAX which is defined in <stdint.h> header. Even with this change, bpf selftests are running fine since these are built with clang and it includes header(-idirafter) from clang/6.0.0/include. (it has <stdint.h>) clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /usr/include \ -idirafter /usr/lib/llvm-6.0/lib/clang/6.0.0/include -idirafter /usr/include/x86_64-linux-gnu \ -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm -c progs/test_sysctl_prog.c -o - | \ llc -march=bpf -mcpu=generic -filetype=obj -o /linux/tools/testing/selftests/bpf/test_sysctl_prog.o But bpf samples are compiled with GCC, and it only searches and includes headers declared at the target file. As '#include <stdint.h>' hasn't been declared in tools/lib/bpf/bpf.h, it causes build failure of bpf samples. gcc -Wp,-MD,./samples/bpf/.sockex3_user.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes \ -O2 -fomit-frame-pointer -std=gnu89 -I./usr/include -I./tools/lib/ -I./tools/testing/selftests/bpf/ \ -I./tools/ lib/ -I./tools/include -I./tools/perf -c -o ./samples/bpf/sockex3_user.o ./samples/bpf/sockex3_user.c; This commit add declaration of '#include <stdint.h>' to tools/lib/bpf/bpf.h to fix this problem. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/bpf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index ff2506fe6bd2..9593fec75652 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -26,6 +26,7 @@
#include <linux/bpf.h>
#include <stdbool.h>
#include <stddef.h>
+#include <stdint.h>
#ifdef __cplusplus
extern "C" {