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improvements to build-lib use case of WebAssembly

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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.
This commit is contained in:
Andrew Kelley
2019-05-16 13:56:56 -04:00
parent 07d0aee11a
commit 81e960eb74
5 changed files with 26 additions and 22 deletions
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2
src/codegen.cpp
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@@ -8548,7 +8548,7 @@ static void gen_root_source(CodeGen *g) {
}
report_errors_and_maybe_exit(g);
if (!g->is_test_build && g->zig_target->os != OsFreestanding &&
if (!g->is_test_build && (g->zig_target->os != OsFreestanding || target_is_wasm(g->zig_target)) &&
g->zig_target->os != OsUefi &&
!g->have_c_main && !g->have_winmain && !g->have_winmain_crt_startup &&
((g->have_pub_main && g->out_type == OutTypeObj) || g->out_type == OutTypeExe))