From 44ca285b73b68f6a8fa3e89004b510d6b7d98e91 Mon Sep 17 00:00:00 2001 From: Enze Li Date: Sat, 11 Jun 2022 18:36:48 +0800 Subject: [PATCH] gdb: initialize the data_head variable to eliminate compilation warnings MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit On a machine with gcc 12, I get this warning: CXX nat/linux-btrace.o In function ‘btrace_error linux_read_bts(btrace_data_bts*, btrace_target_info*, btrace_read_type)’, inlined from ‘btrace_error linux_read_btrace(btrace_data*, btrace_target_info*, btrace_read_type)’ at ../gdb/nat/linux-btrace.c:935:29: ../gdb/nat/linux-btrace.c:865:21: warning: ‘data_head’ may be used uninitialized [-Wmaybe-uninitialized] 865 | pevent->last_head = data_head; | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~ ../gdb/nat/linux-btrace.c: In function ‘btrace_error linux_read_btrace(btrace_data*, btrace_target_info*, btrace_read_type)’: ../gdb/nat/linux-btrace.c:792:9: note: ‘data_head’ was declared here 792 | __u64 data_head, data_tail; | ^~~~~~~~~ Fix this by initializing the 'data_head' variable. Tested by rebuilding on x86_64 openSUSE Tumbleweed with gcc 12. --- gdb/nat/linux-btrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c index b0d6dcd7cf1..c31fb5ffe43 100644 --- a/gdb/nat/linux-btrace.c +++ b/gdb/nat/linux-btrace.c @@ -789,7 +789,7 @@ linux_read_bts (struct btrace_data_bts *btrace, struct perf_event_buffer *pevent; const uint8_t *begin, *end, *start; size_t buffer_size, size; - __u64 data_head, data_tail; + __u64 data_head = 0, data_tail; unsigned int retries = 5; pevent = &tinfo->variant.bts.bts; -- 2.30.2