Remove warning for old linux without secure_getenv

src/core/lib/gpr/env_linux.cc

@@ -38,19 +38,20 @@
 #include "src/core/lib/gpr/string.h"
 #include "src/core/lib/gpr/useful.h"
 
-static const char* gpr_getenv_silent(const char* name, char** dst) {
-  const char* insecure_func_used = nullptr;
+char* gpr_getenv(const char* name) {
   char* result = nullptr;
 #if defined(GPR_BACKWARDS_COMPATIBILITY_MODE)
   typedef char* (*getenv_type)(const char*);
-  static getenv_type getenv_func = NULL;
+  static getenv_type getenv_func = nullptr;
   /* Check to see which getenv variant is supported (go from most
    * to least secure) */
-  const char* names[] = {"secure_getenv", "__secure_getenv", "getenv"};
-  for (size_t i = 0; getenv_func == NULL && i < GPR_ARRAY_SIZE(names); i++) {
-    getenv_func = (getenv_type)dlsym(RTLD_DEFAULT, names[i]);
-    if (getenv_func != NULL && strstr(names[i], "secure") == NULL) {
-      insecure_func_used = names[i];
+  if (getenv_func == nullptr) {
+    const char* names[] = {"secure_getenv", "__secure_getenv", "getenv"};
+    for (size_t i = 0; i < GPR_ARRAY_SIZE(names); i++) {
+      getenv_func = (getenv_type)dlsym(RTLD_DEFAULT, names[i]);
+      if (getenv_func != nullptr) {
+        break;
+      }
     }
   }
   result = getenv_func(name);
@@ -58,20 +59,8 @@ static const char* gpr_getenv_silent(const char* name, char** dst) {
   result = secure_getenv(name);
 #else
   result = getenv(name);
-  insecure_func_used = "getenv";
 #endif
-  *dst = result == nullptr ? result : gpr_strdup(result);
-  return insecure_func_used;
-}
-
-char* gpr_getenv(const char* name) {
-  char* result = nullptr;
-  const char* insecure_func_used = gpr_getenv_silent(name, &result);
-  if (insecure_func_used != nullptr) {
-    gpr_log(GPR_DEBUG, "Warning: insecure environment read function '%s' used",
-            insecure_func_used);
-  }
-  return result;
+  return result == nullptr ? result : gpr_strdup(result);
 }
 
 void gpr_setenv(const char* name, const char* value) {

src/core/lib/gpr/env_posix.cc

@@ -29,11 +29,6 @@
 #include <grpc/support/string_util.h>
 #include "src/core/lib/gpr/string.h"
 
-const char* gpr_getenv_silent(const char* name, char** dst) {
-  *dst = gpr_getenv(name);
-  return nullptr;
-}
-
 char* gpr_getenv(const char* name) {
   char* result = getenv(name);
   return result == nullptr ? result : gpr_strdup(result);