From a3454130760bf51b76495663c60ac6dffbe3d130 Mon Sep 17 00:00:00 2001
From: Iain Sandoe <iain@sandoe.co.uk>
Date: Sat, 21 Nov 2020 09:06:03 +0000
Subject: [PATCH] Darwin, libgfortran : Do not use environ directly from the
 library.

On macOS / Darwin, the environ variable can be used directly in the
code of an executable, but cannot be used in the code of a shared
library (i.e. libgfortran.dylib), in this case.

In such cases, the  function _NSGetEnviron should be called to get
the address of 'environ'.

libgfortran/ChangeLog:

	* intrinsics/execute_command_line.c (environ): Use
	_NSGetEnviron to get the environment pointer on Darwin.
---
 libgfortran/intrinsics/execute_command_line.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libgfortran/intrinsics/execute_command_line.c b/libgfortran/intrinsics/execute_command_line.c
index 71d61a766ad4..6d7b8fc658e6 100644
--- a/libgfortran/intrinsics/execute_command_line.c
+++ b/libgfortran/intrinsics/execute_command_line.c
@@ -34,7 +34,12 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #endif
 #ifdef HAVE_POSIX_SPAWN
 #include <spawn.h>
+# ifdef __APPLE__
+#  include <crt_externs.h>
+#  define environ (*_NSGetEnviron ())
+# else
 extern char **environ;
+# endif
 #endif
 #if defined(HAVE_POSIX_SPAWN) || defined(HAVE_FORK)
 #include <signal.h>
-- 
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