cadabra2: cmake can't find boost

[Schamschula (Marius Schamschula)]

As I was attempting to update cadabra2 to version 2.5.10, cmake @3.31.2_0 failed to detect either version of boost installed via MacPorts.

CMake Error at client_server/CMakeLists.txt:34 (find_package):
  By not providing "FindBoost.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Boost", but
  CMake did not find one.

  Could not find a package configuration file provided by "Boost" (requested
  version 1.71.0) with any of the following names:

    BoostConfig.cmake
    boost-config.cmake

  Add the installation prefix of "Boost" to CMAKE_PREFIX_PATH or set
  "Boost_DIR" to a directory containing one of the above files.  If "Boost"
  provides a separate development package or SDK, be sure it has been
  installed.

By downgrading to cmake @3.29.5_0 the configuration went was expected, and the I could complete the upgrade of cadabra2.

See: ​https://github.com/Schamschula/macports/commit/368ec0037476d5f02324c776a175ac3c663b378e

[ryandesign (Ryan Carsten Schmidt)]

cmake was updated to 3.31.3 today; does the problem remain with that version?

[Schamschula (Marius Schamschula)]

Nope!

I upgraded cmake to 3.31.3 and then ran

sudo port -v configure cadabra2

and got the same error as before.

[mascguy (Christopher Nielsen)]

EDIT: Corrected my original comment, as the initial conclusion was incorrect.

This is a problem on the MacPorts side: By default, MacPorts isn't installing the cmake find scripts for out Boost ports. But that needs to be done unconditionally, to ensure projects can find it.

I've provided the details in the issue you submitted (​https://github.com/kpeeters/cadabra2/issues/331).

[mascguy (Christopher Nielsen)]

Replying to mascguy:

EDIT: Corrected my original comment, as the initial conclusion was incorrect.

This is a problem on the MacPorts side: By default, MacPorts isn't installing the cmake find scripts for out Boost ports. But that needs to be done unconditionally, to ensure projects can find it.

I've provided the details in the issue you submitted (​https://github.com/kpeeters/cadabra2/issues/331).

So in short, our Boost ports have a non-default variant cmake_scripts, which installs what it says. We need to enable that behavior always, and eliminate the variant.

I'll try to take care of that today.

[Schamschula (Marius Schamschula)]

cmake without the scripts is useless!

[mascguy (Christopher Nielsen)]

Replying to Schamschula:

cmake without the scripts is useless!

The reason we haven't seen this with other ports, is that most projects don't set policy CMP0167 to NEW. As a result, the stock FindBoost scripts [provided by CMake] are used.

[Christopher Nielsen <mascguy@…>]

In be86b731cd5f65ac9c027d82af67bb30382dcae5/macports-ports (master):

boost17{1,6,8}: install cmake scripts, eliminating variant

• Note that boost181 is already setup this way, so no change needed

See: #71642

[Christopher Nielsen <mascguy@…>]

In c0f4706e68bd090eebd448b89c71af8691c9092a/macports-ports (master):

cadabra2: add boost to cmake module path

Fixes: #71642