tests/bpf: fix build with incompatibly old linux/bpf.h and/or gcc
* configure.ac: Check how union bpf_attr.log_buf initialization works.
* tests/bpf.c: Check for HAVE_UNION_BPF_ATTR_LOG_BUF.
diff --git a/configure.ac b/configure.ac
index 20fae61..bdaca46 100644
--- a/configure.ac
+++ b/configure.ac
@@ -253,7 +253,6 @@
elf.h
inttypes.h
ioctls.h
- linux/bpf.h
linux/bsg.h
linux/falloc.h
linux/filter.h
@@ -319,6 +318,20 @@
AC_CHECK_MEMBERS([struct input_absinfo.resolution],,, [#include <linux/input.h>])
])
+AC_CHECK_HEADERS([linux/bpf.h], [
+ AC_CACHE_CHECK([whether union bpf_attr.log_buf initialization works],
+ [st_cv_have_union_bpf_attr_log_buf],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <linux/bpf.h>]],
+ [[union bpf_attr a = { .log_buf = 0 };]])],
+ [st_cv_have_union_bpf_attr_log_buf=yes],
+ [st_cv_have_union_bpf_attr_log_buf=no])])
+ if test $st_cv_have_union_bpf_attr_log_buf = yes; then
+ AC_DEFINE(HAVE_UNION_BPF_ATTR_LOG_BUF, [1],
+ [Define to 1 if union bpf_attr.log_buf initialization works])
+ fi
+])
+
AC_CHECK_DECLS([sys_errlist])
AC_CHECK_DECLS(m4_normalize([
PTRACE_PEEKUSER,
diff --git a/tests/bpf.c b/tests/bpf.c
index b2e019d..636fae8 100644
--- a/tests/bpf.c
+++ b/tests/bpf.c
@@ -7,7 +7,7 @@
#include <unistd.h>
#include <sys/syscall.h>
-#if defined HAVE_LINUX_BPF_H && defined __NR_bpf
+#if defined HAVE_UNION_BPF_ATTR_LOG_BUF && defined __NR_bpf
# include <linux/bpf.h>
static const struct bpf_insn insns[] = {
