ASAN fixes.

Author: maleadt

src/dlload.c

@@ -188,7 +188,7 @@ JL_DLLEXPORT JL_NO_SANITIZE void *jl_dlopen(const char *filename, unsigned flags
         dlopen = (dlopen_prototype*)dlsym(RTLD_NEXT, "dlopen");
         if (!dlopen)
             return NULL;
-        void *libdl_handle = dlopen("libdl.so", RTLD_NOW | RTLD_NOLOAD);
+        void *libdl_handle = dlopen("libdl.so.2", RTLD_NOW | RTLD_NOLOAD);
         assert(libdl_handle);
         dlopen = (dlopen_prototype*)dlsym(libdl_handle, "dlopen");
         dlclose(libdl_handle);

src/julia.h

@@ -2157,8 +2157,10 @@ void (ijl_longjmp)(jmp_buf _Buf, int _Value);
 #define jl_setjmp_name "sigsetjmp"
 #endif
 #define jl_setjmp(a,b) sigsetjmp(a,b)
-#if defined(_COMPILER_ASAN_ENABLED_) && __GLIBC__
+#if defined(_COMPILER_ASAN_ENABLED_) && __GLIBC__ && !__GLIBC_PREREQ(2, 34)
 // Bypass the ASAN longjmp wrapper - we're unpoisoning the stack ourselves.
+// Note that this broke with glibc 2.34, where the __libc_siglongjmp symbol
+// was made private, necessitating a different way to bypass the interceptor.
 JL_DLLIMPORT int __attribute__ ((nothrow)) (__libc_siglongjmp)(jl_jmp_buf buf, int val);
 #define jl_longjmp(a,b) __libc_siglongjmp(a,b)
 #else