ERR_get_error_all() exists only in OpenSSL 3.0 and later. Older versions lack this API, causing build failure: sign.c: In function 'display_openssl_errors': sign.c:40:21: warning: implicit declaration of function 'ERR_get_error_all'; did you mean 'ERR_get_error_line'? [-Wimplicit-function-declaration] 40 | while ((e = ERR_get_error_all(&file, &line, NULL, &data, &flags))) { | ^~~~~~~~~~~~~~~~~ | ERR_get_error_line LINK /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/bpftool /usr/lib/gcc/x86_64-alpine-linux-musl/11.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/sign.o: in function `display_openssl_errors.constprop.0': sign.c:(.text+0x59): undefined reference to `ERR_get_error_all' collect2: error: ld returned 1 exit status Use the deprecated ERR_get_error_line_data() for OpenSSL < 3.0, and keep using ERR_get_error_all() when available. Fixes: 40863f4d6ef2 ("bpftool: Add support for signing BPF programs") Signed-off-by: Leo Yan --- tools/bpf/bpftool/sign.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/tools/bpf/bpftool/sign.c b/tools/bpf/bpftool/sign.c index b34f74d210e9..c98edd6d1dde 100644 --- a/tools/bpf/bpftool/sign.c +++ b/tools/bpf/bpftool/sign.c @@ -37,7 +37,11 @@ static void display_openssl_errors(int l) int flags; int line; +#if OPENSSL_VERSION_MAJOR >= 3 while ((e = ERR_get_error_all(&file, &line, NULL, &data, &flags))) { +#else + while ((e = ERR_get_error_line_data(&file, &line, &data, &flags))) { +#endif ERR_error_string_n(e, buf, sizeof(buf)); if (data && (flags & ERR_TXT_STRING)) { p_err("OpenSSL %s: %s:%d: %s", buf, file, line, data); -- 2.34.1