From 937aaf762a873f184d308744cb10ebfcdfc18ec1 Mon Sep 17 00:00:00 2001
From: Marko Lindqvist <cazfi74@gmail.com>
Date: Thu, 9 Dec 2021 03:49:59 +0200
Subject: [PATCH 27/43] Autotools: Add configure check for printf() format
 specifier for size_t

See osdn #43357

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
---
 configure.ac   |  2 ++
 m4/compiler.m4 | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/configure.ac b/configure.ac
index cc506d43eb..dbca961b89 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,8 @@ dnl Sed is needed for the configuration
 dnl of the clients, database setting and the mapimg toolkits.
 AC_PROG_SED
 
+FC_SIZE_T_FORMAT
+
 AC_CACHE_CHECK([can we call malloc(0)], [fc_cv_malloc_zero_ok], [
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdlib.h>
diff --git a/m4/compiler.m4 b/m4/compiler.m4
index 110afd803c..5a5c38b421 100644
--- a/m4/compiler.m4
+++ b/m4/compiler.m4
@@ -127,3 +127,32 @@ elif test "x$qt_ver" = "xQt6" && test "x$HAVE_CXX17" = "x" ; then
   cxx_works=no
 fi
 ])
+
+# Test suitability of a single printf() format specifier for
+# size_t variables. Helper for FC_SIZE_T_FORMAT
+#
+# $1 - Format string
+AC_DEFUN([_FC_SIZE_T_FORMAT_TEST],
+[
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]],
+[[
+size_t var = 0;
+printf("$1", var);]])], [SIZE_T_PRINTF="$1"])
+])
+
+# Find out proper printf() format specifier for size_t variables
+AC_DEFUN([FC_SIZE_T_FORMAT],
+[
+  for fmt in "%zu" "%ld" "%lld"
+  do
+    if test "x$SIZE_T_PRINTF" = "x" ; then
+      _FC_SIZE_T_FORMAT_TEST([${fmt}])
+    fi
+  done
+
+  if test "x$SIZE_T_PRINTF" = "x" ; then
+    AC_MSG_ERROR([Cannot find correct printf format specifier for size_t])
+  fi
+
+  AC_DEFINE_UNQUOTED([SIZE_T_PRINTF], ["$SIZE_T_PRINTF"], [Format specifier for size_t])
+])
-- 
2.33.0