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Annotation of embedaddon/libiconv/srcm4/warn-on-use.m4, revision 1.1.1.1

1.1       misho       1: # warn-on-use.m4 serial 4
                      2: dnl Copyright (C) 2010-2011 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: # gl_WARN_ON_USE_PREPARE(INCLUDES, NAMES)
                      8: # ---------------------------------------
                      9: # For each whitespace-separated element in the list of NAMES, define
                     10: # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
                     11: # even after being undefined as a macro.
                     12: #
                     13: # See warn-on-use.h for some hints on how to poison function names, as
                     14: # well as ideas on poisoning global variables and macros.  NAMES may
                     15: # include global variables, but remember that only functions work with
                     16: # _GL_WARN_ON_USE.  Typically, INCLUDES only needs to list a single
                     17: # header, but if the replacement header pulls in other headers because
                     18: # some systems declare functions in the wrong header, then INCLUDES
                     19: # should do likewise.
                     20: #
                     21: # If you assume C89, then it is generally safe to assume declarations
                     22: # for functions declared in that standard (such as gets) without
                     23: # needing gl_WARN_ON_USE_PREPARE.
                     24: AC_DEFUN([gl_WARN_ON_USE_PREPARE],
                     25: [
                     26:   m4_foreach_w([gl_decl], [$2],
                     27:     [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
                     28:       [Define to 1 if ]m4_defn([gl_decl])[ is declared even after
                     29:        undefining macros.])])dnl
                     30: dnl FIXME: gl_Symbol must be used unquoted until we can assume
                     31: dnl autoconf 2.64 or newer.
                     32:   for gl_func in m4_flatten([$2]); do
                     33:     AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
                     34:     AC_CACHE_CHECK([whether $gl_func is declared without a macro],
                     35:       gl_Symbol,
                     36:       [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
                     37: [@%:@undef $gl_func
                     38:   (void) $gl_func;])],
                     39:         [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])])
                     40:     AS_VAR_IF(gl_Symbol, [yes],
                     41:       [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
                     42:        dnl shortcut - if the raw declaration exists, then set a cache
                     43:        dnl variable to allow skipping any later AC_CHECK_DECL efforts
                     44:        eval ac_cv_have_decl_$gl_func=yes])
                     45:     AS_VAR_POPDEF([gl_Symbol])dnl
                     46:   done
                     47: ])