After a little investigation it seems like the problem is that when you use `-std=c23` or `-std=c11` clang will define `__STRICT_ANSI__`. `strdup` was not available in this mode, at least not prior to C23. So musl does not declare it in that mode.
You can work around this by using `-std=gnu23` or by adding `-D_BSD_SOURCE`. cheers, sam On Mon, Jan 13, 2025 at 11:58 AM Sam Clegg <[email protected]> wrote: > `strdup` is available in emscripten. Its part of the musl libc: > https://github.com/emscripten-core/emscripten/blob/ebfeaf7a17f53ad322ea322efa8dfca5c752679b/system/lib/libc/musl/include/string.h#L70 > > It looks like using `-std=c23` is somehow suppressing that definition. > Could you open a bug about that? > > cheers, > sam > > On Mon, Jan 13, 2025 at 2:18 AM Urjasvi Suthar <[email protected]> > wrote: > >> Hello, >> I am trying to compile for wasm with emscripten but there seems to be no >> 'strdup' C standard function. >> ``` >> src/token.c:169:10: error: use of undeclared identifier 'strdup'; did you >> mean 'strupr'? >> 169 | .str = strdup(str), >> | ^~~~~~ >> | strupr >> /Users/x/emsdk/upstream/emscripten/cache/sysroot/include/compat/string.h:9:14: >> note: 'strupr' declared here >> 9 | extern char* strupr(char *); >> | ^ >> 1 error generated. >> emcc: error: '/Users/x/emsdk/upstream/bin/clang -target >> wasm64-unknown-emscripten -fignore-exceptions -mno-bulk-memory >> -mno-bulk-memory-opt -mno-nontrapping-fptoint -mllvm >> -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm >> -disable-lsr --sysroot=/Users/x/emsdk/upstream/emscripten/cache/sysroot >> -DEMSCRIPTEN -Werror=implicit-function-declaration -Xclang >> -iwithsysroot/include/fakesdl -Xclang -iwithsysroot/include/compat >> -Iexternal/lz4/lib -std=c23 -Wall -Wextra src/token.c -c -o >> /var/folders/7x/khcwdw3d39g8c3k03mcrcw3r0000gn/T/emscripten_temp_u3yctg1o/token_1.o' >> failed (returned 1) >> ``` >> Is this C23 standard not supported yet or am I missing something? >> I know I can implement it myself easily (that what I am currently doing >> as workaround), but less code and #ifdefs the better :) >> >> Regards, >> Urjasvi Suthar >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/d/msgid/emscripten-discuss/c666906e-ad13-4470-8f4a-3aae76b36925n%40googlegroups.com >> <https://groups.google.com/d/msgid/emscripten-discuss/c666906e-ad13-4470-8f4a-3aae76b36925n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_Oe0k%2Bo_Tmhj0GDKkuQTDJ1jp0HGK%3D%3DXqeLoSyfuK%3DCg%40mail.gmail.com.
