Remove no longer used RUBY_ABI_VERSION

configure.ac

@@ -107,9 +107,7 @@ AC_SUBST(GIT)
 AC_SUBST(HAVE_GIT)
 
 eval `sed -n -e ['s/^@%:@define RUBY_[A-Z_]*VERSION_\([A-Z][A-Z][A-Z_0-9]*\) \([0-9][0-9]*\)$/\1=\2/p'] \
-      -e ['s/^@%:@define \(RUBY_ABI_VERSION\) \([0-9][0-9]*\).*/\1=\2/p'] \
       -e ['s/^@%:@define \(RUBY_PATCHLEVEL\) \(.*\)/\1=\2/p'] \
-     $srcdir/include/ruby/internal/abi.h \
      $srcdir/include/ruby/version.h $srcdir/version.h`
 for v in MAJOR MINOR TEENY; do
     AS_IF([eval "test \"\$$v\" = ''"], [
@@ -121,9 +119,6 @@ AC_SUBST(MINOR)
 AC_SUBST(TEENY)
 AC_SUBST(RUBY_API_VERSION, '$(MAJOR).$(MINOR)')
 AC_SUBST(RUBY_PROGRAM_VERSION, '$(MAJOR).$(MINOR).$(TEENY)')
-AS_CASE([$RUBY_PATCHLEVEL], [-*], [
-    AC_DEFINE_UNQUOTED(RUBY_ABI_VERSION, [${RUBY_ABI_VERSION}])
-], [RUBY_ABI_VERSION=])
 
 AS_IF([test "$program_prefix" = NONE], [
   program_prefix=

defs/gmake.mk

@@ -521,10 +521,9 @@ ruby.pc: $(filter-out ruby.pc,$(ruby_pc))
 matz: up
 	$(eval MINOR := $(shell expr $(MINOR) + 1))
 	$(eval message := Development of $(MAJOR).$(MINOR).0 started.)
-	$(eval files := include/ruby/version.h include/ruby/internal/abi.h)
+	$(eval files := include/ruby/version.h)
 	sed -i~ \
 	-e "s/^\(#define RUBY_API_VERSION_MINOR\) .*/\1 $(MINOR)/" \
-	-e "s/^\(#define RUBY_ABI_VERSION\) .*/\1 0/" \
 	 $(files:%=$(srcdir)/%)
 	$(GIT) -C $(srcdir) commit -m "$(message)" $(files)
 

dln.c

@@ -447,31 +447,12 @@ dln_sym(void *handle, const char *symbol)
 }
 #endif
 
-#if defined(RUBY_DLN_CHECK_ABI) && defined(USE_DLN_DLOPEN)
-static bool
-abi_check_enabled_p(void)
-{
-    const char *val = getenv("RUBY_ABI_CHECK");
-    return val == NULL || !(val[0] == '0' && val[1] == '\0');
-}
-#endif
-
 void *
 dln_load(const char *file)
 {
 #if defined(_WIN32) || defined(USE_DLN_DLOPEN)
     void *handle = dln_open(file);
 
-#ifdef RUBY_DLN_CHECK_ABI
-    typedef unsigned long long abi_version_number;
-    typedef abi_version_number abi_version_func(void);
-    abi_version_func *abi_version_fct = (abi_version_func *)dln_sym(handle, EXTERNAL_PREFIX "ruby_abi_version");
-    abi_version_number binary_abi_version = (*abi_version_fct)();
-    if (binary_abi_version != ruby_abi_version() && abi_check_enabled_p()) {
-        dln_loaderror("incompatible ABI version of binary - %s", file);
-    }
-#endif
-
     char *init_fct_name;
     init_funcname(&init_fct_name, file);
     void (*init_fct)(void) = (void(*)(void))dln_sym(handle, init_fct_name);