pkg-config files installed in wrong directory

[Nikolaus Rath]

Hello,

I have defined the following pkg-config file:

pkg = import('pkgconfig')
pkg.generate(libraries: [ libfuse, '-lpthread' ],
libraries_private: '-ldl',
version: meson.project_version(),
name: 'fuse3',
description: 'Filesystem in Userspace',
subdirs: 'fuse3')

On my Debian jessie system, this means Meson puts the files into
/usr/local/lib/x86_64-linux-gnu/:

$ ninja
[0/1] Regenerating build files
The Meson build system
Version: 0.39.0
Source dir: /home/nikratio/in-progress/libfuse
Build dir: /home/nikratio/in-progress/libfuse/build
Build type: native build
Project name: libfuse3
Native c compiler: cc (gcc 4.9.2)
Build machine cpu family: x86_64
Build machine cpu: x86_64
[...]
$ sudo ninja install
[...]
Installing /home/nikratio/in-progress/libfuse/build/meson-private/fuse3.pc to /usr/local/lib/x86_64-linux-gnu/pkgconfig.


Unfortunately that's not a location that pkg-config considers.

What's the best way to fix this?


Thanks,
-Nikolaus

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[Jussi Pakkanen]

On Thu, Jun 22, 2017 at 2:20 AM, Nikolaus Rath <Niko...@rath.org> wrote:

> On my Debian jessie system, this means Meson puts the files into
> /usr/local/lib/x86_64-linux-gnu/:
>

> Unfortunately that's not a location that pkg-config considers.
>
> What's the best way to fix this?

FWICT /usr/local/lib[whatever] is not in the default directories for
looking up shared libraries so it is not surprising that it is also
not used to look up pkg-config files either. Probably the only
reliable way to make this work is to set LD_LIBRARY_PATH and
PKG_CONFIG_PATH to point to their respective directories and then it
should work.

Some distros might have /usr/local/lib and /usr/loca/lib/pkgconfig in
the system search path, in which case just setting libdir to "lib"
should make it work. However that is not guaranteed to work on all
distros.

[Nikolaus Rath]

On Jun 22 2017, Jussi Pakkanen <jpak...@gmail.com> wrote:
> On Thu, Jun 22, 2017 at 2:20 AM, Nikolaus Rath <Niko...@rath.org> wrote:
>
>> On my Debian jessie system, this means Meson puts the files into
>> /usr/local/lib/x86_64-linux-gnu/:
>>
>> Unfortunately that's not a location that pkg-config considers.
>>
>> What's the best way to fix this?
>
> FWICT /usr/local/lib[whatever] is not in the default directories for
> looking up shared libraries

Well, that depends on your definition of "default". It is the default on
Debian, and I believe pretty much the only way to make multi-arch work.

> so it is not surprising that it is also
> not used to look up pkg-config files either. Probably the only
> reliable way to make this work is to set LD_LIBRARY_PATH and
> PKG_CONFIG_PATH to point to their respective directories and then it
> should work.

No, there is no special LD_LIBRARY_PATH required. As far as I can tell,
PKG_CONFIG_PATH is used by pkg-config at runtime to determine where to
look at files, but not at build-time by Meson to determine where to put
files. Am I missing something?

> Some distros might have /usr/local/lib and /usr/loca/lib/pkgconfig in
> the system search path, in which case just setting libdir to "lib"
> should make it work. However that is not guaranteed to work on all
> distros.

No, this will unfortunately put the .so files in the wrong
directory. Note that I am not explicitly setting libdir to anything, the
default (including arch triplet) has been determined by Meson.

For reference:

$ mesonconf
Core properties:

Source dir /home/nikratio/in-progress/libfuse
Build dir /home/nikratio/in-progress/libfuse/build

[...]

Directories:
Option Description Current Value
------ ----------- -------------
prefix Installation prefix. /usr/local
libdir Library directory. lib/x86_64-linux-gnu
libexecdir Library executable directory. libexec
bindir Executable directory. bin
sbindir System executable directory. sbin
includedir Header file directory. include
datadir Data file directory. share
mandir Manual page directory. share/man
infodir Info page directory. share/info
localedir Locale data directory. share/locale
sysconfdir Sysconf data directory. etc
localstatedir Localstate data directory. var
sharedstatedir Architecture-independent data directory. com

[...]



Best,

[Matthieu Gautier]

Hello,

Just to mention that I think this is probably related to the issue I've
recently opened here : https://github.com/mesonbuild/meson/issues/1972

Detecting `lib/[arch-triplet]` as libprefix on Debian seems to be
usefull only if installing in `/usr` prefix.
But, by default, the prefix is `/usr/local`.
(On redhat based distro, the libprefix is not so important as
`/usr/local/lib*` is not in the defaults library directories at all)


Regards,
Matthieu Gautier.

[Nikolaus Rath]

*ping*

Jussi, any comment?

Thanks!
-Nikolaus

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