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# sqlite-threadsafe.m4 serial 2
dnl Copyright (C) 2010 Aleksander Morgado <aleksander@gnu.org>
dnl This file is free software; unlimited permission to copy and/or distribute
dnl it is given, with or without modifications, as long as this notice is
dnl preserved.
dnl This program will execute the sqlite3_threadsafe() method to check
dnl whether the sqlite3 library was compiled in threadsafe mode or not,
dnl and will fill the ax_cv_sqlite_threadsafe cached variable accordingly.
dnl See http://sqlite.org/c3ref/threadsafe.html for more information.
dnl Once this m4 macro has been evaluated, you can for example issue an error
dnl when sqlite3 was not compiled thread-safe:
dnl
dnl AX_SQLITE_THREADSAFE
dnl if test "x$ax_cv_sqlite_threadsafe" != "xyes"; then
dnl AC_MSG_ERROR([sqlite3 is not compiled in a thread-safe mode])
dnl fi
AC_DEFUN([AX_SQLITE_THREADSAFE],
[
AC_REQUIRE([AC_PROG_CC])
save_LIBS="$LIBS"
AC_CHECK_HEADERS([sqlite3.h])
AC_CHECK_LIB([sqlite3],[sqlite3_threadsafe])
AC_CACHE_CHECK([whether sqlite was compiled thread-safe],
[ax_cv_sqlite_threadsafe],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sqlite3.h>
int main ()
{
/* sqlite3_threadsafe() returns the value of the SQLITE_THREADSAFE
* preprocessor macro used when compiling. If this is 0, sqlite3
* library was NOT compiled in a thread-safe mode */
return sqlite3_threadsafe () == 0 ? -1 : 0;
}
]])],
[ax_cv_sqlite_threadsafe=yes],
[ax_cv_sqlite_threadsafe=no],
[ax_cv_sqlite_threadsafe=no])])
LIBS="$save_LIBS"
])
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