For miniperl, use the USE_SITECUSTOMIZE feature to load the build-time @INC

For miniperl (only), always enable USE_SITECUSTOMIZE, but change it to load
a buildcustomize.pl file from $INC[0], if present. The default @INC for
miniperl is '.', so by default this does nothing.

diff --git a/perl.c b/perl.c
index 8f8565d..6bb9f46 100644 (file)
--- a/perl.c
+++ b/perl.c
@@ -24,6 +24,10 @@
  * function of the interpreter; that can be found in perlmain.c
  */
 
+#ifdef PERL_IS_MINIPERL
+#  define USE_SITECUSTOMIZE
+#endif
+
 #include "EXTERN.h"
 #define PERL_IN_PERL_C
 #include "perl.h"
@@ -1973,15 +1977,26 @@ S_parse_body(pTHX_ char **env, XSINIT_t xsinit)
     }
     }
 
-#if defined(USE_SITECUSTOMIZE) && !defined(PERL_IS_MINIPERL)
+#if defined(USE_SITECUSTOMIZE)
     if (!minus_f) {
-       /* SITELIB_EXP is a function call on Win32.
-          The games with local $! are to avoid setting errno if there is no
+       /* The games with local $! are to avoid setting errno if there is no
           sitecustomize script.  */
+#  ifdef PERL_IS_MINIPERL
+       AV *const inc = GvAV(PL_incgv);
+       SV **const inc0 = inc ? av_fetch(inc, 0, FALSE) : NULL;
+
+       if (inc0) {
+           (void)Perl_av_create_and_unshift_one(aTHX_ &PL_preambleav,
+                                                Perl_newSVpvf(aTHX_
+                                                              "BEGIN { do {local $!; -f '%"SVf"/buildcustomize.pl'} && do '%"SVf"/buildcustomize.pl' }", *inc0, *inc0));
+       }
+#  else
+       /* SITELIB_EXP is a function call on Win32.  */
        const char *const sitelib = SITELIB_EXP;
        (void)Perl_av_create_and_unshift_one(aTHX_ &PL_preambleav,
                                             Perl_newSVpvf(aTHX_
                                                           "BEGIN { do {local $!; -f '%s/sitecustomize.pl'} && do '%s/sitecustomize.pl' }", sitelib, sitelib));
+#  endif
     }
 #endif