From 8539548efa098ef59f35be8224deab5557f3116f Mon Sep 17 00:00:00 2001
From: Elliot Saba <staticfloat@gmail.com>
Date: Sat, 26 Dec 2020 15:49:17 -0800
Subject: [PATCH] Use `strcmp()` to compare `f_lib` and
 `JL_LIBJULIA_DL_LIBNAME` (#39005)

This future-proofs us from someone trying lookup a symbol from
`libjulia.dll`, even though that should be quite rare, it may happen.

(cherry picked from commit 0af737c5153bd84821ecffbc539f70f5ba6a1087)
---
 src/runtime_ccall.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/runtime_ccall.cpp b/src/runtime_ccall.cpp
index 1f176afac7ebfb..307acc9c28cd16 100644
--- a/src/runtime_ccall.cpp
+++ b/src/runtime_ccall.cpp
@@ -30,16 +30,16 @@ extern "C"
 void *jl_get_library_(const char *f_lib, int throw_err) JL_NOTSAFEPOINT
 {
     void *hnd;
+    if (f_lib == NULL)
+        return jl_RTLD_DEFAULT_handle;
 #ifdef _OS_WINDOWS_
     if (f_lib == JL_EXE_LIBNAME)
         return jl_exe_handle;
     if (f_lib == JL_LIBJULIA_INTERNAL_DL_LIBNAME)
         return jl_libjulia_internal_handle;
-    if (f_lib == JL_LIBJULIA_DL_LIBNAME)
+    if (strcmp(f_lib, JL_LIBJULIA_DL_LIBNAME) == 0)
         return jl_libjulia_handle;
 #endif
-    if (f_lib == NULL)
-        return jl_RTLD_DEFAULT_handle;
     JL_LOCK_NOGC(&libmap_lock);
     // This is the only operation we do on the map, which doesn't invalidate
     // any references or iterators.