Removed dln_a_out

a.out format is considered extinct nowadays.

configure.ac

@@ -1092,7 +1092,6 @@ main()
 		AC_LIBOBJ([langinfo])
 		],
 [mingw*], [	LIBS="-lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi $LIBS"
-		ac_cv_header_a_out_h=no
 		ac_cv_header_pwd_h=no
 		ac_cv_header_utime_h=no
 		ac_cv_header_sys_ioctl_h=no
@@ -1212,7 +1211,6 @@ dnl AC_HEADER_STDC has been checked in AC_USE_SYSTEM_EXTENSIONS
 AC_HEADER_STDBOOL
 AC_HEADER_SYS_WAIT
 
-AC_CHECK_HEADERS(a.out.h)
 AC_CHECK_HEADERS(atomic.h)
 AC_CHECK_HEADERS(copyfile.h)
 AC_CHECK_HEADERS(direct.h)
@@ -2710,16 +2708,13 @@ main(int argc, char *argv[])
 : "runtime section" && {
 dnl wheather use dln_a_out or not
 AC_ARG_WITH(dln-a-out,
-	AS_HELP_STRING([--with-dln-a-out], [use dln_a_out if possible]),
+	AS_HELP_STRING([--with-dln-a-out], [dln_a_out is deprecated]),
 	[
 	AS_CASE([$withval],
 	[yes], [
-	    AS_IF([test "$enable_shared" = yes], [
-		AC_MSG_ERROR(dln_a_out can not make shared library)
+	    AC_MSG_ERROR(dln_a_out no longer supported)
 	])
-	    with_dln_a_out=yes],
-	[
-	    with_dln_a_out=no])], [with_dln_a_out=no])
+])
 
 AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
@@ -2729,9 +2724,6 @@ rb_cv_binary_elf=no)])
 
 AS_IF([test "$rb_cv_binary_elf" = yes], [
   AC_DEFINE(USE_ELF)
-  AS_IF([test "$with_dln_a_out" = yes], [
-    AC_MSG_ERROR(dln_a_out does not work with ELF)
-  ])
   AC_CHECK_HEADERS([elf.h elf_abi.h])
   AS_IF([test $ac_cv_header_elf_h = yes -o $ac_cv_header_elf_abi_h = yes], [
     AC_LIBOBJ([addr2line])
@@ -2747,7 +2739,7 @@ AS_IF([test "$ac_cv_header_mach_o_loader_h" = yes], [
 AS_CASE(["$target_os"],
 [linux* | gnu* | k*bsd*-gnu | bsdi* | kopensolaris*-gnu], [
     AS_IF([test "$rb_cv_binary_elf" = no], [
-	with_dln_a_out=yes
+	AC_MSG_ERROR(Not ELF)
     ], [
 	LDFLAGS="$LDFLAGS -rdynamic"
     ])])
@@ -2781,7 +2773,7 @@ AC_SUBST(ASMEXT, S)dnl
 
 STATIC=
 
-AS_IF([test "$with_dln_a_out" != yes], [
+: "dlopen" && {
   rb_cv_dlopen=unknown
   AC_MSG_CHECKING(whether OS depend dynamic link works)
   AS_IF([test "$GCC" = yes], [
@@ -2806,8 +2798,9 @@ AS_IF([test "$with_dln_a_out" != yes], [
 	[esix*|uxpds*],   [CCDLFLAGS="$CCDLFLAGS -KPIC"],
 	                  [: ${CCDLFLAGS=""}])
   ])
+}
 
-
+: "rpath" && {
   AC_ARG_ENABLE(rpath,
        AS_HELP_STRING([--enable-rpath], [embed run path into extension libraries.
        enabled by default on ELF platforms]),
@@ -2933,7 +2926,8 @@ AS_IF([test "$with_dln_a_out" != yes], [
 	  RPATHFLAG=" ${rpathflag}%1\$-s"
       ])
   ])
-])
+}
+
 AS_IF([test "${LDSHAREDXX}" = ""], [
     AS_CASE(["${LDSHARED}"],
 	[*'$(CC)'*], [
@@ -3063,33 +3057,7 @@ AC_ARG_WITH(valgrind,
 AS_IF([test x$with_valgrind != xno],
         [AC_CHECK_HEADERS(valgrind/memcheck.h)])
 
-dln_a_out_works=no
-AS_IF([test "$ac_cv_header_a_out_h" = yes], [
-  AS_IF([test "$with_dln_a_out" = yes || test "$rb_cv_dlopen" = unknown], [
-    cat confdefs.h > config.h
-    AC_CACHE_CHECK(whether matz's dln works, rb_cv_dln_a_out,
-    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-#define USE_DLN_A_OUT
-#include "dln.c"
-]], [[]])],
-	rb_cv_dln_a_out=yes,
-	rb_cv_dln_a_out=no)])
-    AS_IF([test "$rb_cv_dln_a_out" = yes], [
-      dln_a_out_works=yes
-      AC_DEFINE(USE_DLN_A_OUT)
-    ])
-  ])
-])
-
-AS_IF([test "$dln_a_out_works" = yes], [
-  AS_IF([test "$GCC" = yes], [
-    STATIC=-static
-  ], [
-    STATIC=-Bstatic
-  ])
-  DLEXT=so
-  CCDLFLAGS=
-], [
+: "dlext & soext" && {
   AS_CASE(["$target_os"],
     [hpux*], [
 	DLEXT=sl],
@@ -3102,9 +3070,10 @@ AS_IF([test "$dln_a_out_works" = yes], [
 	DLEXT=so],
     [
 	DLEXT=so])
-])
 : ${SOEXT="${DLEXT}"}
 AC_SUBST(SOEXT)
+}
+
 AS_IF([test "$rb_cv_dlopen:$load_relative" = yes:yes], [
     AS_IF([test "$ac_cv_func_dladdr" = yes], [
 	LOAD_RELATIVE=1
@@ -3124,9 +3093,7 @@ test ".$DLEXT"  = "." || AC_DEFINE_UNQUOTED(DLEXT,  ".$DLEXT")
 test ".$DLEXT2" = "." || AC_DEFINE_UNQUOTED(DLEXT2, ".$DLEXT2")
 AC_SUBST(DLEXT)
 
-AS_IF([test "$with_dln_a_out" = yes], [
-  STRIP=true
-], [
+: "strip" && {
     AC_MSG_CHECKING([for $STRIP flags])
     AC_LINK_IFELSE([AC_LANG_PROGRAM], [AS_IF(
         ["${STRIP}" -A -n conftest$ac_exeext 2>/dev/null], [
@@ -3140,8 +3107,7 @@ AS_IF([test "$with_dln_a_out" = yes], [
             AC_MSG_RESULT([none needed])
         ])
     ])
-])
-
+}
 
 AC_ARG_WITH(ext,
             AS_HELP_STRING([--with-ext=EXTS],

dln.h

@@ -24,11 +24,6 @@ RUBY_SYMBOL_EXPORT_BEGIN
 
 char *dln_find_exe_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
 char *dln_find_file_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
-
-#ifdef USE_DLN_A_OUT
-extern char *dln_argv0;
-#endif
-
 void *dln_load(const char*);
 
 RUBY_SYMBOL_EXPORT_END

include/ruby/ruby.h

@@ -100,11 +100,6 @@ VALUE rb_require(const char*);
 
 #include "ruby/intern.h"
 
-#if defined(EXTLIB) && defined(USE_DLN_A_OUT)
-/* hook for external modules */
-static char *dln_libs_to_be_linked[] = { EXTLIB, 0 };
-#endif
-
 #define RUBY_VM 1 /* YARV */
 #define HAVE_NATIVETHREAD
 int ruby_native_thread_p(void);

ruby.c

@@ -2554,12 +2554,6 @@ ruby_set_argv(int argc, char **argv)
     int i;
     VALUE av = rb_argv;
 
-#if defined(USE_DLN_A_OUT)
-    if (origarg.argc > 0 && origarg.argv)
-	dln_argv0 = origarg.argv[0];
-    else if (argc > 0 && argv)
-	dln_argv0 = argv[0];
-#endif
     rb_ary_clear(av);
     for (i = 0; i < argc; i++) {
 	VALUE arg = external_str_new_cstr(argv[i]);
@@ -2638,9 +2632,6 @@ ruby_sysinit(int *argc, char ***argv)
     if (*argc >= 0 && *argv) {
 	origarg.argc = *argc;
 	origarg.argv = *argv;
-#if defined(USE_DLN_A_OUT)
-	dln_argv0 = origarg.argv[0];
-#endif
     }
     fill_standard_fds();
 }