46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
From 44ca285b73b68f6a8fa3e89004b510d6b7d98e91 Mon Sep 17 00:00:00 2001
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From: Enze Li <enze.li@hotmail.com>
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Date: Sat, 11 Jun 2022 18:36:48 +0800
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Subject: [PATCH] gdb: initialize the data_head variable to eliminate
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compilation warnings
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On a machine with gcc 12, I get this warning:
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CXX nat/linux-btrace.o
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In function ‘btrace_error linux_read_bts(btrace_data_bts*, btrace_target_info*, btrace_read_type)’,
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inlined from ‘btrace_error linux_read_btrace(btrace_data*, btrace_target_info*, btrace_read_type)’ at ../gdb/nat/linux-btrace.c:935:29:
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../gdb/nat/linux-btrace.c:865:21: warning: ‘data_head’ may be used uninitialized [-Wmaybe-uninitialized]
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865 | pevent->last_head = data_head;
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| ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
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../gdb/nat/linux-btrace.c: In function ‘btrace_error linux_read_btrace(btrace_data*, btrace_target_info*, btrace_read_type)’:
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../gdb/nat/linux-btrace.c:792:9: note: ‘data_head’ was declared here
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792 | __u64 data_head, data_tail;
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| ^~~~~~~~~
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Fix this by initializing the 'data_head' variable.
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Tested by rebuilding on x86_64 openSUSE Tumbleweed with gcc 12.
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---
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gdb/nat/linux-btrace.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c
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index b0d6dcd7cf1..c31fb5ffe43 100644
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--- a/gdb/nat/linux-btrace.c
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+++ b/gdb/nat/linux-btrace.c
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@@ -789,7 +789,7 @@ linux_read_bts (struct btrace_data_bts *btrace,
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struct perf_event_buffer *pevent;
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const uint8_t *begin, *end, *start;
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size_t buffer_size, size;
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- __u64 data_head, data_tail;
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+ __u64 data_head = 0, data_tail;
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unsigned int retries = 5;
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pevent = &tinfo->variant.bts.bts;
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--
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2.33.0
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