[PATCH 6/8] stdint: port to Autoconf 2.70

[Paul Eggert]

* m4/stdint.m4 (gl_STDINT_H): Check for inttypes.h and sys/types.h
instead of assuming that AC_INCLUDES_DEFAULT does it.
The old code relied on AC_INCLUDES_DEFAULT being called
and setting ac_cv_header_inttypes_h and ac_cv_header_sys_types_h,
but this does not occur in Autoconf 2.70.
---
 ChangeLog    | 7 +++++++
 m4/stdint.m4 | 6 +++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 68bae99d9..b8d0daf09 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2020-12-11  Paul Eggert  <eggert@cs.ucla.edu>
 
+       stdint: port to Autoconf 2.70
+       * m4/stdint.m4 (gl_STDINT_H): Check for inttypes.h and sys/types.h
+       instead of assuming that AC_INCLUDES_DEFAULT does it.
+       The old code relied on AC_INCLUDES_DEFAULT being called
+       and setting ac_cv_header_inttypes_h and ac_cv_header_sys_types_h,
+       but this does not occur in Autoconf 2.70.
+
        pid_t.m4: just use 2.70
        * m4/pid_t.m4 (AC_TYPE_PID_T):
        Use Autoconf 2.70 as a prerequisite, not 2.69c.
diff --git a/m4/stdint.m4 b/m4/stdint.m4
index d5f5d6133..95c0944dc 100644
--- a/m4/stdint.m4
+++ b/m4/stdint.m4
@@ -1,4 +1,4 @@
-# stdint.m4 serial 56
+# stdint.m4 serial 57
 dnl Copyright (C) 2001-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -34,7 +34,7 @@ AC_DEFUN_ONCE([gl_STDINT_H],
   AC_SUBST([HAVE_WCHAR_H])
 
   dnl Check for <inttypes.h>.
-  dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_inttypes_h.
+  AC_CHECK_HEADERS_ONCE([inttypes.h])
   if test $ac_cv_header_inttypes_h = yes; then
     HAVE_INTTYPES_H=1
   else
@@ -43,7 +43,7 @@ AC_DEFUN_ONCE([gl_STDINT_H],
   AC_SUBST([HAVE_INTTYPES_H])
 
   dnl Check for <sys/types.h>.
-  dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_sys_types_h.
+  AC_CHECK_HEADERS_ONCE([sys/types.h])
   if test $ac_cv_header_sys_types_h = yes; then
     HAVE_SYS_TYPES_H=1
   else
-- 
2.28.0