[CMake] Interface source paths evaluated relative to dependent library

[Marc CHEVRIER]

Fine.
I am surprised because both commands expects the same thing: a CMake list.
The only touchy point is to ensure that the list separator is correctly
passed to the command without early evaluation. For that purpose ensure
that the generator expression is passed to the command inside quotes:
target_include_directories(target INTERFACE
"$<BUILD_INTERFACE:/to/path1;/to/path2>")



Le lun. 25 juin 2018 à 17:41, Rich T <rsjtaylor.github at gmail.com> a écrit :

> Ah, brilliant - I thought I'd tried that, but just gave it another go
> following your advice and it worked a charm.
> Incidentally, do you know what the rules are around the
> BUILD_INTERFACE generator expression and line breaks / list items?
> It seems to work fine in target_sources when enclosing multiple
> lines/files, but in target_include_directories I need one
> BUILD_INTERFACE expression per directory or I get an error.
>
> Thanks again,
>
> Rich
>
> On Mon, Jun 25, 2018 at 3:28 PM, Marc CHEVRIER <marc.chevrier at gmail.com>
> wrote:
> > You can manage different paths (one for build export and one for install
> > export) by using '$<BUILD_INTERFACE:...>' and '$<INSTALL_INTERFACE:...>'.
> > '$<BUILD_INTERFACE:...>' accepts absolute paths and
> > '$<INSTALL_INTERFACE:...> expects paths relative to the install prefix
> > (CMAKE_INSTALL_PREFIX variable).
> > .
> >
> >
> > Le lun. 25 juin 2018 à 16:23, Rich T <rsjtaylor.github at gmail.com> a
> écrit :
> >>
> >> Hi everyone, I've a question about interface sources.
> >>
> >> If you create an interface target A, add some sources via
> >>
> >> add_library(A INTERFACE)
> >> target_sources(A INTERFACE some/relative/path)
> >>
> >> then link to another library B:
> >>
> >> add_library(B)
> >> target_link_libraries(B PRIVATE A)
> >>
> >> B will search for those sources relative to its own source directory,
> not
> >> the directory where A is defined. This means B fails to configure with a
> >> missing sources error if the targets are in different directories.
> >>
> >> If I specify the paths absolutely, B successfully finds the sources.
> >> However, A can no longer be exported and neither can the static variant
> of B
> >> by association.
> >>
> >> I tried using $<TARGET_PROPERTY:A,SOURCE_DIR> in front of the relative
> >> path, however it turns out SOURCE_DIR isn't a whitelisted property for
> >> INTERFACE libraries.
> >>
> >> Is this behavior intentional, and if so, is there any workaround? (other
> >> than defining all targets with interface sources in the same directory
> as
> >> the targets that use them)
> >> --
> >>
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