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Makefile: Conditional assignment of python exe

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Using `:=` while providing an override (either in Makefile.conf or on the command line) does not correctly apply the override in other simply expanded variables (using `:=`).  Instead, passing an explicit `PYTHON_EXECUTABLE=python3.15` while leaving `PYTHON_CONFIG` implicitly defined results in it being set to `python3-config` instead of the expected `python3.15-config`.
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KrystalDelusion 2025-05-10 09:09:30 +12:00 • committed by GitHub
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@ -204,7 +204,7 @@ endif
include Makefile.conf
endif
PYTHON_EXECUTABLE := $(shell if python3 -c ""; then echo "python3"; else echo "python"; fi)
PYTHON_EXECUTABLE ?= $(shell if python3 -c ""; then echo "python3"; else echo "python"; fi)
ifeq ($(ENABLE_PYOSYS),1)
PYTHON_VERSION_TESTCODE := "import sys;t='{v[0]}.{v[1]}'.format(v=list(sys.version_info[:2]));print(t)"
PYTHON_VERSION := $(shell $(PYTHON_EXECUTABLE) -c ""$(PYTHON_VERSION_TESTCODE)"")