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9efc2f4283
* Lazy-initialize the environment variables. This is the first in a series of PRs to make it easier to use WASI libc in Wasm modules that don't have a `main` function. By initializing the environment on demand, we avoid depending on having `__wasm_call_ctors` run. This uses weak symbols strategically to ensure that if `environ` is used, it is initialized eagerly, but if only `getenv` and friends are used, the environment is initialized lazily. Eventually, I expect we'll have a convention for wasm modules without main functions which will allow the `__wasm_call_ctors` function to be called automatically, but this helps in simple cases for now. Fixes #180. * Add comments explaining the libc-environ-compat.h header usage.
13 lines
442 B
C
13 lines
442 B
C
// This header file is meant to be included withinin the body of a function
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// which uses `__environ`. Code using `__environ` expects it will be initialized
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// eagerly. `__wasilibc_environ` is initialized lazily. Provide `__environ` as
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// an alias and arrange for the lazy initialization to be performed.
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extern char **__wasilibc_environ;
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__wasilibc_ensure_environ();
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#ifndef __wasilibc_environ
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#define __environ __wasilibc_environ
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#endif
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