Cross builds: distinguish between installation prefix and host prefix in configure.ac?

@brettcannon

In Emscripten and wasi builds, and presumably for other cross builds, the build file system and the host file system look different. It's natural to want to install into cross-build/$TARGET/lib and then mount that as /lib in the host file system. wasi.py has to mess around with setting PYTHONPATH because prefix is set to a path from the build machine. I think it would simplify this if we distinguish between

prefix -- the path in the build file system where we want to install the files
host_prefix -- the path in the host file system where getpath.c will look for the files

And similarly for exec_prefix and host_exec_prefix.

cc @brettcannon @freakboy3742

Linked PRs

gh-124932: Distinguish build prefix from host prefix in cross builds #124933

pythongh-124932: Cross builds: Distinguish between build prefix and h…

In regards to the wasi.py reference:

cpython/Tools/wasm/wasi.py

Lines 222 to 228 in 1f9025a

    
           # Use PYTHONPATH to include sysconfig data which must be anchored to the 
        
           # WASI guest's `/` directory. 
        
           args = {"GUEST_DIR": "/", 
        
                   "HOST_DIR": CHECKOUT, 
        
                   "ENV_VAR_NAME": "PYTHONPATH", 
        
                   "ENV_VAR_VALUE": f"/{sysconfig_data}", 
        
                   "PYTHON_WASM": working_dir / "python.wasm"}

pythongh-124932: Cross builds: Distinguish between build prefix and h…

This has been deemed Emscripten-specific over in the PR.

pythongh-124932: Cross builds: Distinguish between build prefix and h…

gh-124932: Distinguish build prefix from host prefix in cross builds (#…

Resolved by #124933

pythongh-124932: Distinguish build prefix from host prefix in cross b…

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Cross builds: distinguish between installation prefix and host prefix in configure.ac? #124932

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	# Use PYTHONPATH to include sysconfig data which must be anchored to the
	# WASI guest's `/` directory.
	args = {"GUEST_DIR": "/",
	"HOST_DIR": CHECKOUT,
	"ENV_VAR_NAME": "PYTHONPATH",
	"ENV_VAR_VALUE": f"/{sysconfig_data}",
	"PYTHON_WASM": working_dir / "python.wasm"}

Cross builds: distinguish between installation prefix and host prefix in configure.ac? #124932

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brettcannon commented on Oct 3, 2024

brettcannon commented on Oct 9, 2024

hoodmane commented on Nov 11, 2024

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