dry run install of symlink errors, real install succeeds

[guijan]

If a meson.build tries to install a symlink to another file installed by Meson, then meson install --dry-run -C build errors because the pointed-to file doesn't exist, while meson install -C build succeeds because the pointed-to file exists.

I've prepared a test Meson project:
meson-dry-run.zip

The contents of the test project are as follows:
meson-dry-run/hello.c

#include <stdio.h>

int
main(void)
{
	puts("Hello, world!");
}

meson-dry-run/meson.build

project('meson-dry-run', 'c',
  version : '0.1',
  default_options : ['warning_level=3'])

hw = executable('hello-world',
                'hello.c',
                install : true)

install_symlink('hello-world-link',
                install_dir : get_option('bindir'),
                pointing_to : hw.name())

Here's a failing dry run:

$ meson install --dry-run -C build
ninja: Entering directory `/tmp/fun/meson-dry-run/build'
[2/2] Linking target hello-world
Installing hello-world to /usr/local/bin

ERROR: Tried to install symlink to missing file /usr/local/bin/hello-world

And a succeeding real install:

$ doas meson install -C build
Dropping privileges to 'jan' before running ninja...
ninja: Entering directory `/tmp/fun/meson-dry-run/build'
ninja: no work to do.
Installing hello-world to /usr/local/bin
Installing symlink pointing to hello-world to /usr/local/bin/hello-world-link