Imported Upstream version 1.3.14

[debian/gzip] / m4 / fpurge.m4

diff --git a/m4/fpurge.m4 b/m4/fpurge.m4
new file mode 100644 (file)
index 0000000..4dba2ec
--- /dev/null
+++ b/m4/fpurge.m4
@@ -0,0 +1,45 @@
+# fpurge.m4 serial 6
+dnl Copyright (C) 2007, 2009 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_CHECK_FUNCS_ONCE([fpurge])
+  AC_CHECK_FUNCS_ONCE([__fpurge])
+  AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]])
+  if test "x$ac_cv_func_fpurge" = xyes; then
+    # Detect BSD bug.  Only cygwin 1.7 is known to be immune.
+    AC_CACHE_CHECK([whether fpurge works], [gl_cv_func_fpurge_works],
+      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
+]], [FILE *f = fopen ("conftest.txt", "w+");
+       if (!f) return 1;
+       if (fputc ('a', f) != 'a') return 2;
+       rewind (f);
+       if (fgetc (f) != 'a') return 3;
+       if (fgetc (f) != EOF) return 4;
+       if (fpurge (f) != 0) return 5;
+       if (putc ('b', f) != 'b') return 6;
+       if (fclose (f) != 0) return 7;
+       if ((f = fopen ("conftest.txt", "r")) == NULL) return 8;
+       if (fgetc (f) != 'a') return 9;
+       if (fgetc (f) != 'b') return 10;
+       if (fgetc (f) != EOF) return 11;
+       if (fclose (f) != 0) return 12;
+       if (remove ("conftest.txt") != 0) return 13;
+       return 0;])],
+      [gl_cv_func_fpurge_works=yes], [gl_cv_func_fpurge_works=no],
+      [gl_cv_func_fpurge_works='guessing no'])])
+    if test "x$gl_cv_func_fpurge_works" != xyes; then
+      REPLACE_FPURGE=1
+      AC_LIBOBJ([fpurge])
+    fi
+  else
+    AC_LIBOBJ([fpurge])
+  fi
+  if test "x$ac_cv_have_decl_fpurge" = xno; then
+    HAVE_DECL_FPURGE=0
+  fi
+])