ncurses 6.0 - patch 20170121

[ncurses.git] / test / aclocal.m4

diff --git a/test/aclocal.m4 b/test/aclocal.m4
index 93fdbaf3f81d2fd6e027dbf8a3b4b77d7f7b6cb9..2d0552a340b4454e79a6f3a74ee0cb6515aef526 100644 (file)
--- a/test/aclocal.m4
+++ b/test/aclocal.m4
@@ -1,5 +1,5 @@
 dnl***************************************************************************
-dnl Copyright (c) 2003-2015,2016 Free Software Foundation, Inc.              *
+dnl Copyright (c) 2003-2016,2017 Free Software Foundation, Inc.              *
 dnl                                                                          *
 dnl Permission is hereby granted, free of charge, to any person obtaining a  *
 dnl copy of this software and associated documentation files (the            *
@@ -26,7 +26,7 @@ dnl sale, use or other dealings in this Software without prior written       *
 dnl authorization.                                                           *
 dnl***************************************************************************
 dnl
-dnl $Id: aclocal.m4,v 1.134 2016/09/04 00:10:41 tom Exp $
+dnl $Id: aclocal.m4,v 1.137 2017/01/21 22:18:40 tom Exp $
 dnl
 dnl Author: Thomas E. Dickey
 dnl
@@ -1118,6 +1118,46 @@ if test "$cf_disable_rpath_hack" = no ; then
 fi
 ])
 dnl ---------------------------------------------------------------------------
+dnl CF_ENABLE_STRING_HACKS version: 5 updated: 2016/10/08 17:34:11
+dnl ----------------------
+dnl On a few platforms, the compiler and/or loader nags with untruthful
+dnl comments stating that "most" uses of strcat/strcpy/sprintf are incorrect,
+dnl and implying that most uses of the recommended alternatives are correct.
+dnl
+dnl Factually speaking, no one has actually counted the number of uses of these
+dnl functions versus the total of incorrect uses.  Samples of a few thousand
+dnl instances are meaningless compared to the hundreds of millions of lines of
+dnl existing C code.
+dnl
+dnl strlcat/strlcpy are (as of 2012) non-standard, and are available on some
+dnl platforms, in implementations of varying quality.  Likewise, snprintf is
+dnl standard - but evolved through phases, and older implementations are likely
+dnl to yield surprising results, as documented in manpages on various systems.
+AC_DEFUN([CF_ENABLE_STRING_HACKS],
+[
+AC_MSG_CHECKING(if you want to work around bogus compiler/loader warnings)
+AC_ARG_ENABLE(string-hacks,
+       [  --enable-string-hacks   work around bogus compiler/loader warnings],
+       [with_string_hacks=$enableval],
+       [with_string_hacks=no])
+AC_MSG_RESULT($with_string_hacks)
+
+if test "x$with_string_hacks" = "xyes"; then
+       AC_DEFINE(USE_STRING_HACKS,1,[Define to 1 to work around bogus compiler/loader warnings])
+       AC_MSG_WARN(enabling string-hacks to work around bogus compiler/loader warnings)
+       AC_CHECK_FUNC(strlcat,[
+               AC_DEFINE(HAVE_STRLCAT,1,[Define to 1 if we have strlcat function])
+               ],[
+               AC_CHECK_LIB(bsd,strlcat,[
+                       CF_ADD_LIB(bsd)
+                       AC_CHECK_HEADERS(bsd/string.h)
+                       AC_DEFINE(HAVE_STRLCAT,1,[Define to 1 if we have strlcat function])
+                       ])
+               ])
+       AC_CHECK_FUNCS( strlcpy snprintf )
+fi
+])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ENABLE_WARNINGS version: 4 updated: 2009/07/26 17:53:03
 dnl ------------------
 dnl Configure-option to enable gcc warnings
@@ -1901,7 +1941,7 @@ AC_SUBST(MAKE_UPPER_TAGS)
 AC_SUBST(MAKE_LOWER_TAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MATH_LIB version: 8 updated: 2010/05/29 16:31:02
+dnl CF_MATH_LIB version: 9 updated: 2017/01/21 11:06:25
 dnl -----------
 dnl Checks for libraries.  At least one UNIX system, Apple Macintosh
 dnl Rhapsody 5.5, does not have -lm.  We cannot use the simpler
@@ -1912,6 +1952,7 @@ AC_CACHE_CHECK(if -lm needed for math functions,
        cf_cv_need_libm,[
        AC_TRY_LINK([
        #include <stdio.h>
+       #include <stdlib.h>
        #include <math.h>
        ],
        [double x = rand(); printf("result = %g\n", ]ifelse([$2],,sin(x),$2)[)],