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      1 # warnings.m4 serial 7
      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_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
     19 #                       [PROGRAM = AC_LANG_PROGRAM()])
     20 # -----------------------------------------------------------------
     21 # Check if the compiler supports OPTION when compiling PROGRAM.
     22 #
     23 # FIXME: gl_Warn must be used unquoted until we can assume Autoconf
     24 # 2.64 or newer.
     25 AC_DEFUN([gl_COMPILER_OPTION_IF],
     26 [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
     27 AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
     28 AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
     29   gl_save_compiler_FLAGS="$gl_Flags"
     30   gl_AS_VAR_APPEND(m4_defn([gl_Flags]), [" $1"])
     31   AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
     32                     [AS_VAR_SET(gl_Warn, [yes])],
     33                     [AS_VAR_SET(gl_Warn, [no])])
     34   gl_Flags="$gl_save_compiler_FLAGS"
     35 ])
     36 AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
     37 AS_VAR_POPDEF([gl_Flags])dnl
     38 AS_VAR_POPDEF([gl_Warn])dnl
     39 ])
     40 
     41 
     42 # gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS],
     43 #             [PROGRAM = AC_LANG_PROGRAM()])
     44 # ---------------------------------------------
     45 # Adds parameter to WARN_CFLAGS if the compiler supports it when
     46 # compiling PROGRAM.  For example, gl_WARN_ADD([-Wparentheses]).
     47 #
     48 # If VARIABLE is a variable name, AC_SUBST it.
     49 AC_DEFUN([gl_WARN_ADD],
     50 [gl_COMPILER_OPTION_IF([$1],
     51   [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])],
     52   [],
     53   [$3])
     54 m4_ifval([$2],
     55          [AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
     56          [AC_SUBST([WARN_CFLAGS])])dnl
     57 ])
     58 
     59 # Local Variables:
     60 # mode: autoconf
     61 # End:
     62