* m4/Makefile.am: new version of file
[findutils.git] / m4 / jm-glibc-io.m4
blob868fa43928c2b17159eba29a200dbf265ad3b285
1 #serial 2
3 dnl From Jim Meyering.
4 dnl
5 dnl See if the glibc *_unlocked I/O macros are available.
6 dnl Use only those *_unlocked macros that are declared.
7 dnl
9 AC_DEFUN(jm_FUNC_GLIBC_UNLOCKED_IO,
10   [
11     io_functions='clearerr_unlocked feof_unlocked ferror_unlocked
12     fflush_unlocked fputc_unlocked fread_unlocked fwrite_unlocked
13     getc_unlocked getchar_unlocked putc_unlocked putchar_unlocked'
14     for jm_io_func in $io_functions; do
15       # Check for the existence of each function only if its declared.
16       # Otherwise, we'd get the Solaris5.5.1 functions that are not
17       # declared, and that have been removed from Solaris5.6.  The resulting
18       # 5.5.1 binaries would not run on 5.6 due to shared library differences.
19       jm_CHECK_DECLARATIONS([#include <stdio.h>
20                             ], $jm_io_func,
21                             jm_declared=yes,
22                             jm_declared=no)
23       if test $jm_declared = yes; then
24         AC_CHECK_FUNCS($jm_io_func)
25       fi
26     done
27   ]