From d79c650a5ed08c5b16203f7c6a40809eed830de7 Mon Sep 17 00:00:00 2001
From: Dana Robinson <43805+derobins@users.noreply.github.com>
Date: Wed, 23 Jun 2021 12:08:04 -0700
Subject: Further simplifies Autotools type size checks (#789)

Also fixes an issue where clock_gettime and difftime are not detected
due to earlier simplifications of this code.
---
 configure.ac | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/configure.ac b/configure.ac
index b5f4fe1..cfd9d0c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1351,16 +1351,6 @@ CFLAGS="$H5_CFLAGS $AM_CFLAGS $CFLAGS"
 ## Checkpoint the cache
 AC_CACHE_SAVE
 
-## Write the confdefs.h header for checking sizes
-cat >>confdefs.h <<\EOF
-#include <stdbool.h>
-#include <stdint.h>
-#ifdef HAVE_UNISTD_H
-#include <sys/types.h>
-#endif
-#include <time.h>
-EOF
-
 AC_CHECK_SIZEOF(        [int8_t])
 AC_CHECK_SIZEOF(       [uint8_t])
 AC_CHECK_SIZEOF(  [int_least8_t])
@@ -1389,12 +1379,12 @@ AC_CHECK_SIZEOF([uint_least64_t])
 AC_CHECK_SIZEOF(  [int_fast64_t])
 AC_CHECK_SIZEOF( [uint_fast64_t])
 
-AC_CHECK_SIZEOF([bool])
+AC_CHECK_SIZEOF([bool], [], [#include <stdbool.h>])
 AC_CHECK_SIZEOF([off_t])
 AC_CHECK_SIZEOF([ptrdiff_t])
 AC_CHECK_SIZEOF([size_t])
 AC_CHECK_SIZEOF([ssize_t])
-AC_CHECK_SIZEOF([time_t])
+AC_CHECK_SIZEOF([time_t], [], [#include <time.h>])
 
 ## Checkpoint the cache
 AC_CACHE_SAVE
-- 
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