From 0637780a1f6e49d4ec9026e24ba941bbd9991833 Mon Sep 17 00:00:00 2001
From: Michael Lee <mzlee@fb.com>
Date: Sat, 28 Jan 2017 19:43:50 -0800
Subject: [PATCH] char ** enivron is inconsistent on some platforms

Summary: The forward declaration of `extern char ** environ` is inconsistent on some platforms.

Reviewed By: strager, Orvid

Differential Revision: D4474856

fbshipit-source-id: c73a7c7d5a247e962fab06aeb65df7815f0e3bcb
---
 folly/portability/Stdlib.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/folly/portability/Stdlib.h b/folly/portability/Stdlib.h
index 3aca93bf..9b16d760 100644
--- a/folly/portability/Stdlib.h
+++ b/folly/portability/Stdlib.h
@@ -18,6 +18,13 @@
 
 #include <cstdlib>
 
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#if (TARGET_OS_OSX || TARGET_OS_SIMULATOR)
+#include <crt_extern.h>
+#endif
+#endif
+
 extern "C" {
 #ifdef _WIN32
 // These are technically supposed to be defined linux/limits.h and
@@ -34,7 +41,7 @@ int mkstemp(char* tn);
 char* realpath(const char* path, char* resolved_path);
 int setenv(const char* name, const char* value, int overwrite);
 int unsetenv(const char* name);
-#else
-extern char** environ;
+#elif defined(__APPLE__) && (TARGET_OS_OSX || TARGET_OS_SIMULATOR)
+#define environ (*_NSGetEnviron())
 #endif
 }
-- 
2.34.1