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How to make gdb debug mode work with tramp?

From: Zhongwei Yao
Subject: How to make gdb debug mode work with tramp?
Date: Sun, 3 Sep 2017 22:10:45 +0800

Hi, all,

I try to use 'M-x gdb' on Mac with tramp. But it runs into varies errors.

Here are some details:

emacs 25.1.1 runs on Mac with tramp And I have a test project
on a raspberry pi directory: /home/xxx/project/test_gdb/. It has a simple
file: test.c. test.c is compiled by gcc with -O0 -g to test_bin.

1 int foo(int a, int b) {
2  int c = a + b;
3  return c;
4 }
6 int main(void) {
7  return foo(3, 4);
8 }

1. Open test.c on raspberry pi in emacs
2. run 'M-x gdb'  gdb -i=mi test_bin and open gdb-many-window mode.
3. In *gud-test* buffer, run: break 7

Then I get an error in emacs Message:
no longer exists!

And in *gud-test* buffer, it prints following:
=== gud-test content start ===
96   Breakpoint 1 at 0x103c4: file test.c, line 7.
97   (gdb) list test.c:1
98   1 int foo(int a, int b) {
99   2  int c = a + b;
100 3  return c;
101 4 }
102 5
103 6 int main(void) {
104 7  return foo(3, 4);
105 8 }
=== gud-test content end ===

line 96 is OK, but I don't know why it prints line 97 to 105. I have not
typed any 'list' command. And it has set a break point on line 7.

4. I continue to run some debug command like: continue, but *gud-test*
buffer stucks until I type "Ctrl+g".

I don't know which part causes such error, gud-mode, tramp-mode or
something else and how to fix it.

Thanks for any suggestion!

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