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Strip GCC-only -fno-merge-constants from flags in conda build #2978

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Strip GCC-only -fno-merge-constants from flags in conda build #2978

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f9e9781
Strip -fno-merge-constants flag
antonwolfy Jun 29, 2026
b8516f7
Update changelog
antonwolfy Jun 29, 2026
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -54,6 +54,7 @@ This release is compatible with NumPy 2.5.
* Fixed `dpnp.linalg.svd(..., hermitian=True)` returning a non-unitary `vh` for singular input arrays due to a zero sign appearing [#2954](https://github.com/IntelPython/dpnp/pull/2954)
* Fixed scalar conversion of size-one `dpnp.tensor.usm_ndarray` (e.g. `int()`, `float()`, indexing) which failed with NumPy 2.5 after the in-place `ndarray.shape` assignment was deprecated [#2958](https://github.com/IntelPython/dpnp/pull/2958)
* Fixed `dpnp.mgrid` and `dpnp.ogrid` to return consistent results between single-slice and tuple-of-slices syntax when the step is a complex number with a non-integer magnitude (e.g. `2.5j`) [#2971](https://github.com/IntelPython/dpnp/pull/2971)
* Fixed `icx`/`icpx` warning during `conda build` by stripping the GCC-only `-fno-merge-constants` flag injected by conda-forge into `CFLAGS`/`CXXFLAGS` [#2978](https://github.com/IntelPython/dpnp/pull/2978)

### Security

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9 changes: 9 additions & 0 deletions conda-recipe/build.sh
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Expand Up @@ -22,6 +22,15 @@ fi
export CC=icx
export CXX=icpx

# conda-forge's gcc/g++ activation injects -fno-merge-constants into CFLAGS/CXXFLAGS
# when CONDA_BUILD==1. icx/icpx don't implement this GCC flag and emit warning #10430
# (they have -fmerge-all-constants instead). Drop it to keep the build log clean; it
# is a no-op for the Intel compiler. See CMPLRLLVM-19167 / CMPLRLLVM-28729 and the
# conda-forge change that added the flag (later scoped to CONDA_BUILD only in #194):
# https://github.com/conda-forge/ctng-compiler-activation-feedstock/pull/193
export CFLAGS="${CFLAGS//-fno-merge-constants/}"
export CXXFLAGS="${CXXFLAGS//-fno-merge-constants/}"

export CMAKE_GENERATOR=Ninja
# Make CMake verbose
export VERBOSE=1
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