build: Support fmt 11 (follow-up) (#3371)

* build: Support fmt 11

A few other elements were required, as observed in:
https://github.com/mamba-org/mamba/pull/3352

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

* Unpin python on 3.9

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

* ci: use libcxx<18 for macOS

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

* Add TODO comment

Co-authored-by: Hind-M <Hind-M@users.noreply.github.com>

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

---------

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

.github/workflows/unix_impl.yml

@@ -28,6 +28,12 @@ jobs:
           environment-file: ./dev/environment-dev.yml
           environment-name: build_env
           cache-environment: true
+      - name: Use libcxx <18 (see conda-forge/libcxx-feedstock#162)
+        # TODO: remove this step once the issue is fixed
+        # See: https://github.com/conda-forge/libcxx-feedstock/issues/162
+        if: startsWith(inputs.os, 'macos')
+        run: |
+          micromamba install -n build_env -c conda-forge "libcxx<18"
       - uses: hendrikmuhs/ccache-action@main
         with:
           variant: sccache

dev/environment-dev.yml

@@ -24,7 +24,7 @@ dependencies:
   # micromamba dependencies
   - cli11 >=2.2
   # micromamba test dependencies
-  - python =3.9  # Some not too recent version
+  - python
   - mitmproxy
   - pytest >=7.3.0
   - pytest-asyncio

libmamba/tests/src/doctest-printer/array.hpp

@@ -8,6 +8,7 @@
 
 #include <doctest/doctest.h>
 #include <fmt/format.h>
+#include <fmt/ranges.h>
 
 namespace doctest
 {

libmamba/tests/src/doctest-printer/flat_set.hpp

@@ -6,6 +6,7 @@
 
 #include <doctest/doctest.h>
 #include <fmt/format.h>
+#include <fmt/ranges.h>
 
 #include "mamba/util/flat_set.hpp"
 

libmamba/tests/src/doctest-printer/vector.hpp

@@ -8,6 +8,7 @@
 
 #include <doctest/doctest.h>
 #include <fmt/format.h>
+#include <fmt/ranges.h>
 
 namespace doctest
 {

libmamba/tests/src/solver/test_problems_graph.cpp

@@ -11,6 +11,7 @@
 
 #include <doctest/doctest.h>
 #include <fmt/format.h>
+#include <fmt/ranges.h>
 #include <nlohmann/json.hpp>
 
 #include "mamba/core/channel_context.hpp"