From c0dc7335e0aad01f64d3f424cb3b94db49d0e4ec Mon Sep 17 00:00:00 2001
From: Dana Robinson <derobins@hdfgroup.org>
Date: Tue, 12 Mar 2024 10:23:04 -0700
Subject: [PATCH] Use AC_SYS_LARGEFILE on Autotools

We previously used a hack introduced in 1.8.5 to paper over differences
in off_t and off64_t when determining the type sizes. We no longer explicitly
support off64_t in the library and AC_SYS_LARGEFILE works fine.
---
 acsite.m4    | 53 ----------------------------------------------------
 configure.ac | 23 +++--------------------
 2 files changed, 3 insertions(+), 73 deletions(-)
 delete mode 100644 acsite.m4

diff --git a/acsite.m4 b/acsite.m4
deleted file mode 100644
index 1782033dc84..00000000000
--- a/acsite.m4
+++ /dev/null
@@ -1,53 +0,0 @@
-dnl -------------------------------------------------------------------------
-dnl -------------------------------------------------------------------------
-dnl
-dnl Copyright by The HDF Group.
-dnl All rights reserved.
-dnl
-dnl This file is part of HDF5.  The full HDF5 copyright notice, including
-dnl terms governing use, modification, and redistribution, is contained in
-dnl the COPYING file, which can be found at the root of the source code
-dnl dnl distribution tree, or in https://www.hdfgroup.org/licenses.
-dnl dnl If you do not have access to either file, you may request a copy from
-dnl dnl help@hdfgroup.org.
-dnl
-dnl Macros for HDF5 Fortran
-dnl
-dnl -------------------------------------------------------------------------
-dnl -------------------------------------------------------------------------
-
-dnl -------------------------------------------------------------------------
-dnl _AC_SYS_LARGEFILE_MACRO_VALUE
-dnl
-dnl The following macro overrides the autoconf macro of the same name
-dnl with this custom definition. This macro performs the same checks as
-dnl autoconf's native _AC_SYS_LARGEFILE_MACRO_VALUE, but will also set
-dnl AM_CPPFLAGS with the appropriate -D defines so additional configure
-dnl sizeof checks do not fail.
-dnl
-# _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
-#               CACHE-VAR,
-#               DESCRIPTION,
-#               PROLOGUE, [FUNCTION-BODY])
-# ----------------------------------------------------------
-m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
-[AC_CACHE_CHECK([for $1 value needed for large files], [$3],
-[while :; do
-  m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
-    [AC_LANG_PROGRAM([$5], [$6])],
-    [$3=no; break])
-  m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
-    [AC_LANG_PROGRAM([@%:@define $1 $2
-$5], [$6])],
-    [$3=$2; break])
-  $3=unknown
-  break
-done])
-case $$3 in #(
-  no | unknown) ;;
-  *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4])
-     AM_CPPFLAGS="-D$1=$$3 $AM_CPPFLAGS";;
-esac
-rm -rf conftest*[]dnl
-])# _AC_SYS_LARGEFILE_MACRO_VALUE
-
diff --git a/configure.ac b/configure.ac
index 4646ba78368..0fa2b3f213c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1460,26 +1460,9 @@ if test "X${enable_shared}" = "Xyes"; then
 fi
 
 ## ----------------------------------------------------------------------
-## Use the macro _AC_SYS_LARGEFILE_MACRO_VALUE to test defines
-## that might need to be set for largefile support to behave
-## correctly. This macro is defined in acsite.m4 and overrides
-## the version provided by Autoconf (as of v2.65). The custom
-## macro additionally adds the appropriate defines to AM_CPPFLAGS
-## so that later configure checks have them visible.
-
-## Check for _FILE_OFFSET_BITS
-_AC_SYS_LARGEFILE_MACRO_VALUE([_FILE_OFFSET_BITS], [64],
-  [ac_cv_sys_file_offset_bits],
-  [Number of bits in a file offset, on hosts where this is settable.],
-  [_AC_SYS_LARGEFILE_TEST_INCLUDES])
-
-## Check for _LARGE_FILES
-if test "$ac_cv_sys_file_offset_bits" = unknown; then
-  _AC_SYS_LARGEFILE_MACRO_VALUE([_LARGE_FILES], [1],
-    [ac_cv_sys_large_files],
-    [Define for large files, on AIX-style hosts.],
-    [_AC_SYS_LARGEFILE_TEST_INCLUDES])
-fi
+## Set up large file support
+
+AC_SYS_LARGEFILE
 
 ## ----------------------------------------------------------------------
 ## Add necessary defines for Linux Systems.