Firstly, my apologies. The test.cpp I supplied was an attempt at a quick simplification, and as you said it doesn't produce "enough" syntax errors actually.
I am pasting below a test.cpp that I have verified on my setup does hang the tramp window.
I'm afraid that there is another complication for reproducability. I cannot get the issue to reproduce when I do "M-x compile" then invoking "gcc test.cpp". It appears to reproduce only when doing "make" on a larger / more complex project containing test.cpp. This is true even when test.cpp is the first file that compiles in the project upon "make".
I attempted to make a small autotools project containing test.cpp, but even that doesn't seem to reproduce the tramp hang. Only by including test.cpp in a large preexisting project does the hang occur, at least for me.
I would suggest that you take a favorite large C++ autotools project, add test.cpp to the source tree and Makefile.am, and see if the hang reproduces for you.
For your reference, I am also pasting the output from the hung tramp window when I added test.cpp to a library within one of my own larger projects.
Regards,
D.
======= Hung Tramp Window ==========
-*- mode: compilation; default-directory: "/ssh:username@TWR1HM:/home/username/Dropbox/progs/thisprog/sbshared/src/" -*-
Compilation started at Sun Jan 3 11:02:36
make -k
make all-am
make[1]: Entering directory '/home/username/Dropbox/progs/thisprog/sbshared/src'
/bin/bash ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -std=c++11 -Wall -Werror -Wclobbered -Wempty-body -Wignored-qualifiers -Wmissing-field-initializers -Wsign-compare -Wtype-limits -Wuninitialized -Winit-self -Wcast-align -Wfloat-equal -Wformat=2 -Wno-psabi -I/usr/include/libxml2 -I../../../kilo -I../../../rapidxml -g3 -Og -DDEBUG=1 -MT test.lo -MD -MP -MF .deps/test.Tpo -c -o test.lo test.cpp
libtool: compile: g++ -DHAVE_CONFIG_H -I. -std=c++11 -Wall -Werror -Wclobbered -Wempty-body -Wignored-qualifiers -Wmissing-field-initializers -Wsign-compare -Wtype-limits -Wuninitialized -Winit-self -Wcast-align -Wfloat-equal -Wformat=2 -Wno-psabi -I/usr/include/libxml2 -I../../../kilo -I../../../rapidxml -g3 -Og -DDEBUG=1 -MT test.lo -MD -MP -MF .deps/test.Tpo -c test.cpp -fPIC -DPIC -o .libs/test.o
==================================
// test.cpp - for lots of syntax errors
#include <mutex>
#include <string>
#include <vector>
#include <memory>
class A1
{
int f1();
int f2();
int f3();
int f4();
int f5();
int f6();
int f7();
int f8();
int f9();
};
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
class Nested
{
A1 m1;
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
};
class A2
{
std::shared_ptr<A1> a1ptr;
A2() {A1 a1; a1ptr = &a1;}
};
#define AN_BODY \
A1 x1; \
A1 x2; \
std::string s1(x1); \
std::string s2(x2); \
Nested n1; \
const std::vector<std::string> v1(1, a1); \
const std::vector<std::string> v1(1, n1); \
std::vector<std::string> * v1_cptr(&v1); \
return(s1+s2);
int A1::f1()
{
AN_BODY;
}
int A1::f2()
{
AN_BODY;
}
int A1::f3()
{
AN_BODY;
}
int A1::f4()
{
AN_BODY;
}
int A1::f5()
{
AN_BODY;
}
int A1::f6()
{
AN_BODY;
}
int A1::f7()
{
AN_BODY;
}
int A1::f8()
{
AN_BODY;
}
int A1::f9()
{
AN_BODY;
}
int A1::f10()
{
AN_BODY;
}
int main(int argc, char* argv[])
{
AN_BODY;
}
// end test.cpp
==================================
Michael Albinus <michael.albinus@gmx.de> writes:
Hi Duncan,
>> Is there anything I can do that would help diagnose / pinpoint or
>> whatever? Either with the ctrl-gx3 matter, or indeed with the
>> underlying hang in the tramp compile window which requires the use of
>> ctrl-gx3.
>
> I will try to reproduce it locally. Since I don't know where to start
> with debugging, I cant give you instructions for this yet.
I've tried to trigger this error, but I cannot. Calling "M-x compile",
and invoking "gcc test.cpp" then, returns immediately with one error
message:
--8<---------------cut here---------------start------------->8---
-*- mode: compilation; default-directory: "/ssh:detlef:/home/albinus/tmp/" -*-
Compilation started at Sun Jan 3 11:23:16
gcc test.cpp
test.cpp:2:13: error: expected constructor, destructor, or type conversion before ‘(’ token
2 | DummyClass(
| ^
Compilation exited abnormally with code 1 at Sun Jan 3 11:23:16
--8<---------------cut here---------------end--------------->8---
What does it need to hang Emacs/Tramp, compiling this file?
>> Best regards,
>> Duncan
Best regards, Michael.