code.delx.au - gnu-emacs/blob - m4/warnings.m4

   1 # warnings.m4 serial 6
   2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Simon Josefsson
   8
   9 # gl_AS_VAR_APPEND(VAR, VALUE)
  10 # ----------------------------
  11 # Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
  12 m4_ifdef([AS_VAR_APPEND],
  13 [m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
  14 [m4_define([gl_AS_VAR_APPEND],
  15 [AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
  16
  17
  18 # gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS])
  19 # ------------------------------------------------
  20 # Adds parameter to WARN_CFLAGS if the compiler supports it.  For example,
  21 # gl_WARN_ADD([-Wparentheses]).
  22 #
  23 # If VARIABLE is a variable name, AC_SUBST it.
  24 AC_DEFUN([gl_WARN_ADD],
  25 dnl FIXME: gl_Warn must be used unquoted until we can assume
  26 dnl autoconf 2.64 or newer.
  27 [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
  28 AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
  29 AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
  30   gl_save_compiler_FLAGS="$gl_Flags"
  31   gl_Flags="$gl_Flags $1"
  32   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
  33                     [AS_VAR_SET(gl_Warn, [yes])],
  34                     [AS_VAR_SET(gl_Warn, [no])])
  35   gl_Flags="$gl_save_compiler_FLAGS"
  36 ])
  37 AS_VAR_IF(gl_Warn, [yes],
  38   [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])])
  39 AS_VAR_POPDEF([gl_Flags])dnl
  40 AS_VAR_POPDEF([gl_Warn])dnl
  41 m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
  42 ])