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libiconv 1.16

    1: # warn-on-use.m4 serial 6
    2: dnl Copyright (C) 2010-2019 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: # If the module 'posixcheck' is in use:
   10: #
   11: # For each whitespace-separated element in the list of NAMES, define
   12: # HAVE_RAW_DECL_name if the function has a declaration among INCLUDES
   13: # even after being undefined as a macro.
   14: #
   15: # See warn-on-use.h for some hints on how to poison function names, as
   16: # well as ideas on poisoning global variables and macros.  NAMES may
   17: # include global variables, but remember that only functions work with
   18: # _GL_WARN_ON_USE.  Typically, INCLUDES only needs to list a single
   19: # header, but if the replacement header pulls in other headers because
   20: # some systems declare functions in the wrong header, then INCLUDES
   21: # should do likewise.
   22: #
   23: # It is generally safe to assume declarations for functions declared
   24: # in the intersection of C89 and C11 (such as printf) without
   25: # needing gl_WARN_ON_USE_PREPARE.
   26: AC_DEFUN([gl_WARN_ON_USE_PREPARE],
   27: [
   28:   m4_ifdef([gl_POSIXCHECK],
   29:     [m4_foreach_w([gl_decl], [$2],
   30:        [AH_TEMPLATE([HAVE_RAW_DECL_]AS_TR_CPP(m4_defn([gl_decl])),
   31:          [Define to 1 if ]m4_defn([gl_decl])[ is declared even after
   32:           undefining macros.])])dnl
   33: dnl FIXME: gl_Symbol must be used unquoted until we can assume
   34: dnl autoconf 2.64 or newer.
   35:      for gl_func in m4_flatten([$2]); do
   36:        AS_VAR_PUSHDEF([gl_Symbol], [gl_cv_have_raw_decl_$gl_func])dnl
   37:        AC_CACHE_CHECK([whether $gl_func is declared without a macro],
   38:          gl_Symbol,
   39:          [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$1],
   40: [@%:@undef $gl_func
   41:   (void) $gl_func;])],
   42:            [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])])
   43:        AS_VAR_IF(gl_Symbol, [yes],
   44:          [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$gl_func]), [1])
   45:           dnl shortcut - if the raw declaration exists, then set a cache
   46:           dnl variable to allow skipping any later AC_CHECK_DECL efforts
   47:           eval ac_cv_have_decl_$gl_func=yes])
   48:        AS_VAR_POPDEF([gl_Symbol])dnl
   49:      done
   50:     ])
   51: ])