73 lines
2.5 KiB
Text
73 lines
2.5 KiB
Text
# fpurge.m4 serial 12
|
|
dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
AC_DEFUN([gl_FUNC_FPURGE],
|
|
[
|
|
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
AC_CHECK_HEADERS_ONCE([stdio_ext.h])
|
|
AC_CHECK_FUNCS_ONCE([fpurge])
|
|
AC_CHECK_FUNCS_ONCE([__fpurge])
|
|
AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]])
|
|
if test "x$ac_cv_func_fpurge" = xyes; then
|
|
HAVE_FPURGE=1
|
|
# Detect BSD bug. Only cygwin 1.7 and musl are known to be immune.
|
|
AC_CACHE_CHECK([whether fpurge works], [gl_cv_func_fpurge_works],
|
|
[AC_RUN_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#include <stdio.h>
|
|
]],
|
|
[[FILE *f = fopen ("conftest.txt", "w+");
|
|
if (!f)
|
|
return 1;
|
|
if (fputc ('a', f) != 'a')
|
|
{ fclose (f); return 2; }
|
|
rewind (f);
|
|
if (fgetc (f) != 'a')
|
|
{ fclose (f); return 3; }
|
|
if (fgetc (f) != EOF)
|
|
{ fclose (f); return 4; }
|
|
if (fpurge (f) != 0)
|
|
{ fclose (f); return 5; }
|
|
if (putc ('b', f) != 'b')
|
|
{ fclose (f); return 6; }
|
|
if (fclose (f) != 0)
|
|
return 7;
|
|
if ((f = fopen ("conftest.txt", "r")) == NULL)
|
|
return 8;
|
|
if (fgetc (f) != 'a')
|
|
{ fclose (f); return 9; }
|
|
if (fgetc (f) != 'b')
|
|
{ fclose (f); return 10; }
|
|
if (fgetc (f) != EOF)
|
|
{ fclose (f); return 11; }
|
|
if (fclose (f) != 0)
|
|
return 12;
|
|
if (remove ("conftest.txt") != 0)
|
|
return 13;
|
|
return 0;
|
|
]])],
|
|
[gl_cv_func_fpurge_works=yes],
|
|
[gl_cv_func_fpurge_works=no],
|
|
[case "$host_os" in
|
|
# Guess yes on musl systems.
|
|
*-musl*) gl_cv_func_fpurge_works="guessing yes" ;;
|
|
# Otherwise obey --enable-cross-guesses.
|
|
*) gl_cv_func_fpurge_works="$gl_cross_guess_normal" ;;
|
|
esac
|
|
])
|
|
])
|
|
case "$gl_cv_func_fpurge_works" in
|
|
*yes) ;;
|
|
*) REPLACE_FPURGE=1 ;;
|
|
esac
|
|
else
|
|
HAVE_FPURGE=0
|
|
fi
|
|
if test "x$ac_cv_have_decl_fpurge" = xno; then
|
|
HAVE_DECL_FPURGE=0
|
|
fi
|
|
])
|