jm-glibc-io.m4n

Linux下文件工具。

#serial 6 -*- autoconf -*-

dnl From Jim Meyering.
dnl
dnl See if the glibc *_unlocked I/O macros are available.
dnl Use only those *_unlocked macros that are declared.
dnl

AC_DEFUN([jm_FUNC_GLIBC_UNLOCKED_IO],
  [
    # Kludge (not executed) to make autoheader do the right thing.
    if test a = b; then
      AC_CHECK_DECLS([@comma_separated@])
      AC_CHECK_FUNCS(@space_separated@)
    fi

    io_functions='@space_separated@'

    for jm_io_func in $io_functions; do
      # Check for the existence of each function only if it is declared.
      # Otherwise, we'd get the Solaris5.5.1 functions that are not
      # declared, and that have been removed from Solaris5.6.  The resulting
      # 5.5.1 binaries would not run on 5.6 due to shared library differences.
      AC_CHECK_DECLS([$jm_io_func],
		     jm_declared=yes,
		     jm_declared=no,
		     [#include <stdio.h>])
      if test $jm_declared = yes; then
        AC_CHECK_FUNCS($jm_io_func)
      fi
    done
  ]
)