add stubs for dlopen, dlsym, etc.

Makefile

@@ -90,6 +90,7 @@ LIBC_TOP_HALF_MUSL_SOURCES = \
         misc/a64l.c \
         misc/basename.c \
         misc/dirname.c \
+        misc/dl.c \
         misc/ffs.c \
         misc/ffsl.c \
         misc/ffsll.c \
@@ -445,7 +446,6 @@ MUSL_OMIT_HEADERS += \
     "netdb.h" \
     "resolv.h" \
     "pty.h" \
-    "dlfcn.h" \
     "setjmp.h" \
     "ulimit.h" \
     "sys/xattr.h" \

expected/wasm32-wasi-threads/defined-symbols.txt

@@ -573,6 +573,10 @@ difftime
 dirfd
 dirname
 div
+dlclose
+dlerror
+dlopen
+dlsym
 dprintf
 drand48
 drem

expected/wasm32-wasi-threads/include-all.c

@@ -75,6 +75,7 @@
 #include <crypt.h>
 #include <ctype.h>
 #include <dirent.h>
+#include <dlfcn.h>
 #include <endian.h>
 #include <err.h>
 #include <errno.h>

expected/wasm32-wasi-threads/predefined-macros.txt

@@ -1499,6 +1499,15 @@
 #define RRFIXEDSZ NS_RRFIXEDSZ
 #define RRQ 01
 #define RS_HIPRI 0x01
+#define RTLD_DEFAULT ((void *)0)
+#define RTLD_DI_LINKMAP 2
+#define RTLD_GLOBAL 256
+#define RTLD_LAZY 1
+#define RTLD_LOCAL 0
+#define RTLD_NEXT ((void *)-1)
+#define RTLD_NODELETE 4096
+#define RTLD_NOLOAD 4
+#define RTLD_NOW 2
 #define RUSAGE_CHILDREN 2
 #define RUSAGE_SELF 1
 #define R_OK (4)
@@ -2044,6 +2053,7 @@
 #define _Complex_I (0.0f+1.0fi)
 #define _DIRENT_H 
 #define _DIRENT_HAVE_D_TYPE 
+#define _DLFCN_H
 #define _ENDIAN_H 
 #define _ERRNO_H 
 #define _ERR_H 

expected/wasm32-wasi/defined-symbols.txt

@@ -509,6 +509,10 @@ difftime
 dirfd
 dirname
 div
+dlclose
+dlerror
+dlopen
+dlsym
 dprintf
 drand48
 drem

expected/wasm32-wasi/include-all.c

@@ -75,6 +75,7 @@
 #include <crypt.h>
 #include <ctype.h>
 #include <dirent.h>
+#include <dlfcn.h>
 #include <endian.h>
 #include <err.h>
 #include <errno.h>

expected/wasm32-wasi/predefined-macros.txt

@@ -1467,6 +1467,15 @@
 #define RRFIXEDSZ NS_RRFIXEDSZ
 #define RRQ 01
 #define RS_HIPRI 0x01
+#define RTLD_DEFAULT ((void *)0)
+#define RTLD_DI_LINKMAP 2
+#define RTLD_GLOBAL 256
+#define RTLD_LAZY 1
+#define RTLD_LOCAL 0
+#define RTLD_NEXT ((void *)-1)
+#define RTLD_NODELETE 4096
+#define RTLD_NOLOAD 4
+#define RTLD_NOW 2
 #define RUSAGE_CHILDREN 2
 #define RUSAGE_SELF 1
 #define R_OK (4)
@@ -2010,6 +2019,7 @@
 #define _Complex_I (0.0f+1.0fi)
 #define _DIRENT_H 
 #define _DIRENT_HAVE_D_TYPE 
+#define _DLFCN_H
 #define _ENDIAN_H 
 #define _ERRNO_H 
 #define _ERR_H 

libc-top-half/musl/src/misc/dl.c

@@ -0,0 +1,31 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+#define EXPORT __attribute__((visibility("default"))) __attribute__((used))
+#define WEAK __attribute__((__weak__))
+
+static const char *error = 0;
+
+EXPORT WEAK int dlclose(void *library) {
+    error = "dlclose not implemented";
+    return -1;
+}
+
+EXPORT WEAK char *dlerror(void) {
+    const char *var = error;
+    error = 0;
+    return (char*) var;
+}
+
+EXPORT WEAK void *dlopen(const char *name, int flags) {
+    error = "dlopen not implemented";
+    return 0;
+}
+
+EXPORT WEAK void *dlsym(void *library, const char *name) {
+    error = "dlsym not implemented";
+    return 0;
+}