On 2015-11-25, B. Wilson wrote:
> When running :make and there is output to both stderr and stdout,
> I'm seeing a degree of reordering in the displayed output.
>
> I didn't notice any similar issues when searching the mailing
> list, but forgive me if this is already a known bug/feature.
>
> Below I give steps on how to reproduce the behaviour on my machine
> as well as the output of `vim --version`. I will be happy to
> produce any other details that may be necessary.
>
>
> ## Reproducing the Behaviour
>
> Create the following `foo.c` file:
>
> #include <stdio.h>
>
> int main()
> {
> printf("This is a message on stdout and should appear
> first\n");
> fprintf(stderr, "This is a message on stderr and should
> appear second\n");
>
> return 0;
> }
>
> Create the following `Makefile`:
>
> run: foo
> @./foo
>
> Compile the program:
>
> $ make foo
>
> Let make compile and run the program:
>
> $ make run
> cc foo.c -o foo
> This is a message on stdout and should appear first
> This is a message on stderr and should appear second
In this case, foo's stdout and stderr are directed to your terminal,
so those outputs are unbuffered.
> Now compare this to when calling `:make run` from `vim`:
>
> :make run
> This is a message on stderr and should appear second
> This is a message on stdout and should appear first
>
> Press ENTER or type command to continue
In this case, foo's stdout and stderr are directed to Vim's pipeline
that collects make's output, so those outputs are buffered.
Consequently, the lines appear in the order in which the buffers are
flushed and not necessarily the order in which the lines were
written to the buffers.
The decision to buffer or unbuffer streams is made by the shell, not
by Vim.
Regards,
Gary
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