Re: [PATCH 3/4] cmake: add a preparatory work-around to accommodate `vcpkg`

> On 2021-03-27 23:06:24+0000, Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com> wrote:
> > From: Johannes Schindelin <johannes.schindelin@gmx.de>
> >
> > We are about to add support for installing the `.dll` files of Git's
> > dependencies (such as libcurl) in the CMake configuration. The `vcpkg`
> > ecosystem from which we get said dependencies makes that relatively
> > easy: simply turn on `X_VCPKG_APPLOCAL_DEPS_INSTALL`.
> >
> > However, current `vcpkg` introduces a limitation if one does that:
> > While it is totally cool with CMake to specify multiple targets within
> > one invocation of `install(TARGETS ...) (at least according to
> > https://cmake.org/cmake/help/latest/command/install.html#command:install),
> > `vcpkg`'s parser insists on a single target per `install(TARGETS ...)`
> > invocation.
> >
> > Well, that's easily accomplished: Let's feed the targets individually to
> > the `install(TARGETS ...)` function in a `foreach()` look.
> >
> > This also has the advantage that we do not have to manually cull off the
> > two entries from the `${PROGRAMS_BUILT}` array before scheduling the
> > remainder to be installed into `libexec/git-core`. Instead, we iterate
> > through the array and decide for each entry where it wants to go.
> >
> > Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > ---
> >  contrib/buildsystems/CMakeLists.txt | 14 +++++++++-----
> >  1 file changed, 9 insertions(+), 5 deletions(-)
> >
> > diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
> > index da2811ae3aad..a166be0eb1b8 100644
> > --- a/contrib/buildsystems/CMakeLists.txt
> > +++ b/contrib/buildsystems/CMakeLists.txt
> > @@ -811,15 +811,19 @@ list(TRANSFORM git_shell_scripts PREPEND "${CMAKE_BINARY_DIR}/")
> >  list(TRANSFORM git_perl_scripts PREPEND "${CMAKE_BINARY_DIR}/")
> >
> >  #install
> > -install(TARGETS git git-shell
> > +foreach(program ${PROGRAMS_BUILT})
> > +if(${program} STREQUAL git OR ${program} STREQUAL git-shell)
>
> Please don't use `${}` around variable inside `if()`, and quote the
> string. CMake has a quirk with the `${}` inside if (expanded variable
> will be treated as a variable if it is defined, or string otherwise).
> Unquoted string will be seen as a variable if it's defined, string
> otherwise. IOW, suggested command:
>
> 	if (program STREQUAL "git" OR program STREQUAL "git-shell")
>
> We also have another problem with quoted arguments could be interpreted
> as variable or keyword if CMP0054 policy not enabled, too.
> I think it's better to have it enabled, but it's not in the scope of
> this patch.
>
>  https://cmake.org/cmake/help/latest/policy/CMP0054.html