Try using workaround from cacticouncil/lilypad

.github/workflows/build-wasm.yml

@@ -14,7 +14,7 @@ jobs:
           export CXX=clang++
       - run: cargo install wasm-pack
       - run: |
-          mkdir dist
+          export CFLAGS_wasm32_unknown_unknown := `echo "-I$(pwd)/wasm-sysroot -Wbad-function-cast -Wcast-function-type -fno-builtin"`
           wasm-pack build --release -d ./dist
       - uses: actions/upload-artifact@v4
         with:

wasm-sysroot/assert.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#define assert(ignore) ((void)0)
+#define static_assert(cnd, msg) assert(cnd && msg)

wasm-sysroot/ctype.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int isprint(int c);

wasm-sysroot/inttypes.h

@@ -0,0 +1,3 @@
+#pragma once
+
+#define PRId32 "d"

wasm-sysroot/stdbool.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#define bool _Bool
+#define true 1
+#define false 0

wasm-sysroot/stdint.h

@@ -0,0 +1,19 @@
+#pragma once
+
+typedef signed char int8_t;
+typedef short int16_t;
+typedef long int32_t;
+typedef long long int64_t;
+
+typedef unsigned char uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned long uint32_t;
+typedef unsigned long long uint64_t;
+
+typedef unsigned long size_t;
+
+typedef unsigned int uintptr_t;
+
+#define UINT8_MAX 0xff
+#define UINT16_MAX 0xffff
+#define UINT32_MAX 0xffffffff

wasm-sysroot/stdio.h

@@ -0,0 +1,19 @@
+#pragma once
+
+// just some filler type
+#define FILE void
+
+#define stdin NULL
+#define stdout NULL
+#define stderr NULL
+
+int fprintf(FILE *__restrict__, const char *__restrict__, ...);
+int fputs(const char *__restrict, FILE *__restrict);
+int fputc(int, FILE *);
+FILE *fdopen(int, const char *);
+int fclose(FILE *);
+
+int vsnprintf(char *s, unsigned long n, const char *format, ...);
+
+#define sprintf(str, ...) 0
+#define snprintf(str, len, ...) 0

wasm-sysroot/stdlib.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <stdint.h>
+
+#define NULL ((void*)0)
+
+void* malloc(size_t size);
+void* calloc(size_t nmemb, size_t size);
+void free(void* ptr);
+void* realloc(void* ptr, size_t size);
+
+void abort(void);

wasm-sysroot/string.h

@@ -0,0 +1,7 @@
+#pragma once
+
+void *memcpy(void *dest, const void *src, unsigned long n);
+void *memmove(void *dest, const void *src, unsigned long n);
+void *memset(void *s, int c, unsigned long n);
+int memcmp(const void *ptr1, const void *ptr2, unsigned long n);
+int strncmp(const char *s1, const char *s2, unsigned long n);

wasm-sysroot/time.h

@@ -0,0 +1,5 @@
+#pragma once
+
+typedef unsigned long clock_t;
+#define CLOCKS_PER_SEC ((clock_t)1000000)
+clock_t clock(void);

wasm-sysroot/unistd.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int dup(int);

wasm-sysroot/wctype.h

@@ -0,0 +1,7 @@
+#pragma once
+
+typedef __WCHAR_TYPE__ wchar_t;
+typedef __WINT_TYPE__ wint_t;
+
+int iswspace(wchar_t ch);
+int iswalnum(wint_t _wc);