ExtUtils::MakeMaker changes for perl5113delta.pod

[perl5.git] / win32 / perllib.c

diff --git a/win32/perllib.c b/win32/perllib.c
index 9b488d1..ff21210 100644 (file)
--- a/win32/perllib.c
+++ b/win32/perllib.c
@@ -1,5 +1,9 @@
 /*
- * "The Road goes ever on and on, down from the door where it began."
+ *      The Road goes ever on and on
+ *          Down from the door where it began.
+ *
+ *     [Bilbo on p.35 of _The Lord of the Rings_, I/i: "A Long-Expected Party"]
+ *     [Frodo on p.73 of _The Lord of the Rings_, I/iii: "Three Is Company"]
  */
 #define PERLIO_NOT_STDIO 0
 #include "EXTERN.h"
@@ -211,11 +215,12 @@ RunPerl(int argc, char **argv, char **env)
     char szModuleName[MAX_PATH];
     char *arg0 = argv[0];
     char *ansi = NULL;
+    bool use_environ = (env == environ);
 
     osver.dwOSVersionInfoSize = sizeof(osver);
     GetVersionEx(&osver);
 
-    if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT) {
+    if (osver.dwMajorVersion > 4) {
         WCHAR widename[MAX_PATH];
         GetModuleFileNameW(NULL, widename, sizeof(widename)/sizeof(WCHAR));
         argv[0] = ansi = win32_ansipath(widename);
@@ -245,6 +250,16 @@ RunPerl(int argc, char **argv, char **env)
     perl_construct(my_perl);
     PL_perl_destruct_level = 0;
 
+    /* PERL_SYS_INIT() may update the environment, e.g. via ansify_path().
+     * This may reallocate the RTL environment block. Therefore we need
+     * to make sure that `env` continues to have the same value as `environ`
+     * if we have been called this way.  If we have been called with any
+     * other value for `env` then all environment munging by PERL_SYS_INIT()
+     * will be lost again.
+     */
+    if (use_environ)
+        env = environ;
+
     exitstatus = perl_parse(my_perl, xs_init, argc, argv, env);
     if (!exitstatus) {
 #if defined(TOP_CLONE) && defined(USE_ITHREADS)                /* XXXXXX testing */