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‎.github/workflows/deploy.yml‎

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name: deploy
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runs-on: "ubuntu-latest"
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steps:
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- uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
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- uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
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- uses: conda-incubator/setup-miniconda@835234971496cad1653abb28a638a281cf32541f # v3.2.0
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with:

‎.pre-commit-config.yaml‎

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- id: prettier
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types_or: [markdown, mdx, json, yaml, css, javascript]
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- repo: https://github.com/astral-sh/ruff-pre-commit
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rev: v0.14.3
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rev: v0.14.7
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hooks:
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- id: ruff-format
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ci:

‎blog/2025-11-21-gcc-macos.md‎

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---
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authors:
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- isuruf
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tags: [infrastructure]
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---
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# gcc, g++ builds on macos
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On macOS, conda-forge has provided `clang`, `clangxx` as the sole compiler
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for C and C++ sources. We have also provided `gfortran` to compile FORTRAN
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sources. Unlike other package managers like homebrew we have not
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provided `gcc` nor `g++` on macos. The reason to not provide those have been
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to avoid incompatibility with the clang based toolchain and also the
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maintenance burden. There are two main incompatibilities. First,
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`clang++` uses `libc++` as the standard C++ library and `g++` uses
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`libstdc++` as the standard C++ library. Second, `clang` uses `libomp`
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as the OpenMP library whereas `gcc` uses `libgomp` as the OpenMP library.
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Today, we announce the availability of `gcc`, `g++` compilers on macos.
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You can install them using
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```bash
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conda install gcc gxx
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```
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Currently we support only gcc 15 and will not support gcc 14 or previous
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versions.
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The main difference between these packages and a vanilla gcc installation
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or the installation from Homebew is that they use `libomp` as the default
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OpenMP library and `libc++` as the default standard C++ library.
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This difference makes binaries compiled with `gcc`, `g++` compatible with
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binaries compiled with `clang`, `clang++`.
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Another interesting consequence of the infrastructure work done to enable
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this is that this enables cross compilation of C/C++ sources using `gcc`,
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`g++` to cross-compile macOS binaries from Linux (previously only `clang`
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supported this) and also cross-compile windows binaries from macOS using
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the GCC/MinGW compilers.
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To use them in conda-build recipes, you can use
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```yaml
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requirements:
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build:
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- {{ compiler('gcc') }} # [osx]
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- {{ compiler('gxx') }} # [osx]
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- {{ stdlib('c') }}
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```
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You can also do
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```yaml
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c_compiler: # [osx]
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- gcc # [osx]
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c_compiler_version: # [osx]
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- 15 # [osx]
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cxx_compiler: # [osx]
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- gxx # [osx]
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cxx_compiler_version: # [osx]
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- 15 # [osx]
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```
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in `conda_build_config.yaml` and continue to use the well-established
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`{{ compiler("c") }}` and `{{ compiler("cxx") }}` macros in the recipe;
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be aware that you're then responsible for updating the version roughly once
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per year (to keep pace with the rest of conda-forge).
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When you are using `gcc` locally, similar to `clang`, we make some guesses
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about where the macOS SDK is located. This might fail sometimes and setting
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the environment variable `SDKROOT` to the root of the macOS SDK should make
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`gcc` look in that folder.
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We also add by default `-L $CONDA_PREFIX/lib -Wl,-rpath,$CONDA_PREFIX/lib`
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when linkingfor local builds with the `conda-gcc-specs` package that is
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installed by deault with `gcc` package. If you want to avoid that you can
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install the `gcc-no-conda-specs` package alongside `gcc`.

‎blog/2025-11-22-r-support.md‎

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---
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authors:
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- r
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tags: [infrastructure]
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---
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# R support in conda-forge
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Earlier this month, Anaconda [announced](https://www.anaconda.com/blog/changes-to-anacondas-r-channel-support) that they are deprecating the `r` channel bundled in the `defaults` multichannel.
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This decision does _not_ impact R packages in conda-forge, which continue to be available without any changes.
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<!-- truncate -->
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The [`@conda-forge/r` team](https://github.com/conda-forge/r-feedstock/blob/7de3342693b3e1e98c2461d5385d8ebcce6b04db/recipe/meta.yaml#L30-L40) currently maintains [4.4K+ feedstocks](https://github.com/search?type=code&q=org%3Aconda-forge+%22-+conda-forge%2Fr%22+path%3Arecipe%2F) for the two latest minor R releases, and will continue to do so. At the time of writing, these are R 4.5 and R 4.4. Older versions are still available but won't receive any updates or rebuilds. When R 4.6 is released, 4.5 will still be maintained and 4.4 will stop receiving updates, and so on.
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If you have any questions, please do not hesitate to open an issue in the [`r` feedstock](https://github.com/conda-forge/r-feedstock) or in [our Zulip chat instance](https://conda-forge.zulipchat.com/).

‎blog/authors.yml‎

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title: The conda-forge core team
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url: https://github.com/orgs/conda-forge/teams/core
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image_url: https://github.com/conda-forge.png
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r:
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name: conda-forge/r
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title: The maintainers of the R ecosystem in conda-forge
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url: https://github.com/orgs/conda-forge/teams/r
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image_url: https://avatars.githubusercontent.com/t/2337964
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beckermr:
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name: Matthew R. Becker
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title: Member of conda-forge/core

‎community/minutes/2017-11-16.md‎

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- toolchain: https://github.com/conda-forge/toolchain-feedstock/blob/master/recipe/activate.sh
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- toolchain3: https://github.com/conda-forge/toolchain3-feedstock/blob/master/recipe/activate.sh
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- anaconda: https://github.com/AnacondaRecipes/aggregate/blob/master/ctng-compilers-activation-feedstock/recipe/conda_build_config.cos6.x86_64.yaml#L41-L54
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| Variable | toolchain only | anaconda only | |
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| -------- | --------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | |
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| CFLAGS | -m${ARCH} | march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -pipe | |
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| CPPFLAGS | | -D_FORTIFY_SOURCE=2 -O2 | |
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| CXXFLAGS | -DBOOST_MATH_DISABLE_FLOAT128 -m${ARCH} | -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -pipe | |
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| LDFLAGS | -Wl,-rpath,$PREFIX/lib | Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now | |
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| Variable | toolchain only | anaconda only |
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| -------- | --------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| CFLAGS | -m${ARCH} | march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -pipe |
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| CPPFLAGS | | -D_FORTIFY_SOURCE=2 -O2 |
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| CXXFLAGS | -DBOOST_MATH_DISABLE_FLOAT128 -m${ARCH} | -fvisibility-inlines-hidden -std=c++17 -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -pipe |
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| LDFLAGS | -Wl,-rpath,$PREFIX/lib | Wl,-O2 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now |
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- LLVM/clang
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- toolchain: https://github.com/conda-forge/toolchain-feedstock/blob/master/recipe/activate.sh
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- toolchain3: https://github.com/conda-forge/toolchain3-feedstock/blob/master/recipe/activate.sh
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- anaconda: https://github.com/AnacondaRecipes/aggregate/blob/master/clang/build.sh
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| Variable | toolchain only | anaconda only |
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| ---------- | ----------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| CPPFLAGS | | -mmacosx-version-min=${MACOSX_VERSION_MIN} |
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| CFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -m${ARCH} | -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe |
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| CXXFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -m${ARCH} | -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -stdlib=libc++ -fvisibility-inlines-hidden -std=c++14 -fmessage-length=0 |
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| LDFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -lc++ -Wl,-rpath,$PREFIX/lib | -pie |
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| LDFLAGS_CC | | -Wl,-pie -Wl,-headerpad_max_install_names |
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| | | |
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| Variable | toolchain only | anaconda only |
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| ---------- | ----------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| CPPFLAGS | | -mmacosx-version-min=${MACOSX_VERSION_MIN} |
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| CFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -m${ARCH} | -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe |
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| CXXFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -m${ARCH} | -march=core2 -mtune=haswell -mssse3 -ftree-vectorize -fPIC -fPIE -fstack-protector-strong -O2 -pipe -stdlib=libc++ -fvisibility-inlines-hidden -std=c++14 -fmessage-length=0 |
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| LDFLAGS | -mmacosx-version-min=${MACOSX_VERSION_MIN} -lc++ -Wl,-rpath,$PREFIX/lib | -pie |
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| LDFLAGS_CC | | -Wl,-pie -Wl,-headerpad_max_install_names |
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- Fortran
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- toolchain: (not set)
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- toolchain3: (not set)
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- anaconda:
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- Linux: https://github.com/AnacondaRecipes/aggregate/blob/master/ctng-compilers-activation-feedstock/recipe/conda_build_config.cos6.x86_64.yaml#L46
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- Mac: https://github.com/AnacondaRecipes/aggregate/blob/master/gfortran-feedstock/recipe/build.sh#L5
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- Windows: flags that affect some things (cmake)
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| Variable | anaconda value |
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| -------------- | ------------------------------- |
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| CFLAGS | %CFLAGS% -MD -GL |
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| CXXFLAGS | %CXXFLAGS% -MD -GL |
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| LDFLAGS_SHARED | %LDFLAGS_SHARED% -LTCG ucrt.lib |
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| Variable | anaconda value |
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| -------------- | ------------------------------- |
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| CFLAGS | %CFLAGS% -MD -GL |
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| CXXFLAGS | %CXXFLAGS% -MD -GL |
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| LDFLAGS_SHARED | %LDFLAGS_SHARED% -LTCG ucrt.lib |
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Overall: everyone receptive to new compilers. Mike to provide way of keeping host and build prefix separate, even when not cross compiling. This would avoid need for things like "always_include_files" and would facilitate conda-forge keeping their llvmdev recipe as is (for cling usage).

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