improvements to build-lib use case of WebAssembly #2507
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* build-exe does include the startup code that supplies _start for the wasm32-freestanding target. Previously this did not occur because of logic excluding "freestanding". * build-lib for wasm32-freestanding target gets linked by LLD. To avoid infinite recursion, compiler_rt and zig libc are built as objects rather than libraries. - no "lib" prefix and ".wasm" extension instead of ".a". Rather than build-lib foo.zig producing "libfoo.a", now it produces "foo.wasm". * go back to using `.o` extension for webassembly objects * zig libc only provides _start symbol for wasm when linking libc.
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wasm32-freestanding target. Previously this did not occur because
of logic excluding "freestanding".
infinite recursion, compiler_rt and zig libc are built as objects
rather than libraries.
build-lib foo.zig producing "libfoo.a", now it produces "foo.wasm".
.oextension for webassembly objects