[gcc/devel/omp/gcc-12] libgomp: Use libiberty environ.h to declare the environment pointer.

[Tobias Burnus <burnus@gcc.gnu.org>]

https://gcc.gnu.org/g:7fbe23803a00cfb714073a25a095db645c61a405

commit 7fbe23803a00cfb714073a25a095db645c61a405
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon Sep 12 09:18:58 2022 +0200

    libgomp: Use libiberty environ.h to declare the environment pointer.
    
    This allows for target-specific mechanisms for finding the pointer.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
    libgomp/ChangeLog:
    
            * env.c (initialize_env): Include libiberty environ.h.
    
    (cherry picked from commit 7d37c7f67c1bb75f85ad0c07bfff51ca579e1476)

Diff:
---
 libgomp/ChangeLog.omp | 7 +++++++
 libgomp/env.c         | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/libgomp/ChangeLog.omp b/libgomp/ChangeLog.omp
index 4eb6cfaf1b1..e25a9ad8c49 100644
--- a/libgomp/ChangeLog.omp
+++ b/libgomp/ChangeLog.omp
@@ -1,3 +1,10 @@
+2022-09-12  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backport from mainline:
+	2022-09-10  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* env.c (initialize_env): Include libiberty environ.h.
+
 2022-09-12  Tobias Burnus  <tobias@codesourcery.com>
 
 	Backport from mainline:
diff --git a/libgomp/env.c b/libgomp/env.c
index 92f32f72020..ac8c764db60 100644
--- a/libgomp/env.c
+++ b/libgomp/env.c
@@ -60,6 +60,7 @@
 #endif /* LIBGOMP_OFFLOADED_ONLY */
 
 #include "secure_getenv.h"
+#include "environ.h"
 
 /* Default values of ICVs according to the OpenMP standard.  */
 const struct gomp_default_icv gomp_default_icv_values = {
@@ -2033,7 +2034,6 @@ startswith (const char *str, const char *prefix)
 static void __attribute__((constructor))
 initialize_env (void)
 {
-  extern char **environ;
   char **env;
   int omp_var, dev_num = 0, dev_num_len = 0, i;
   bool ignore = false;