Allow different ways to manipulate environment for XP vs 64-bit

Commit fa147bd 'Use putenv to implement unsetenv/clearenv' allowed
BusyBox to run on ReactOS but broke it on Windows XP so it was
reverted.

It turns out that the same change is required on 64-bit Windows.
Reinstate the 'safe' environment manipulation code but make it a
configuration option.  Add a config file for 64-bit Windows that
does the right thing.

1 files changed, 10 insertions, 0 deletions

diff --git a/Config.in b/Config.in
index c2ee45dfd..36ca6447d 100644
--- a/Config.in
+++ b/Config.in
@@ -642,6 +642,16 @@ config GLOBBING
           the BusyBox binary to handle wildcard expansion using the C runtime
           set this to 'Y'.
 
+config SAFE_ENV
+        bool "Manipulate the environment through safe API calls"
+        default n
+        depends on PLATFORM_MINGW32
+        help
+          Enable this option to use safe API calls when clearing environment
+          variables.  This is necessary if BusyBox is to run on ReactOS or
+          64-bit Windows.  The default is 'N', which must be used if BusyBox
+          is to run on Windows XP.
+
 config CROSS_COMPILER_PREFIX
         string "Cross Compiler prefix"
         default ""