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Annotation of embedaddon/libiconv/srcm4/warn-on-use.m4, revision 1.1.1.2

1.1.1.2 ! misho       1: # warn-on-use.m4 serial 6
        !             2: dnl Copyright (C) 2010-2019 Free Software Foundation, Inc.
1.1       misho       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: # ---------------------------------------
1.1.1.2 ! misho       9: # If the module 'posixcheck' is in use:
        !            10: #
1.1       misho      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: #
1.1.1.2 ! misho      23: # It is generally safe to assume declarations for functions declared
        !            24: # in the intersection of C89 and C11 (such as printf) without
1.1       misho      25: # needing gl_WARN_ON_USE_PREPARE.
                     26: AC_DEFUN([gl_WARN_ON_USE_PREPARE],
                     27: [
1.1.1.2 ! misho      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
1.1       misho      33: dnl FIXME: gl_Symbol must be used unquoted until we can assume
                     34: dnl autoconf 2.64 or newer.
1.1.1.2 ! misho      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],
1.1       misho      40: [@%:@undef $gl_func
                     41:   (void) $gl_func;])],
1.1.1.2 ! misho      42:            [AS_VAR_SET(gl_Symbol, [yes])], [AS_VAR_SET(gl_Symbol, [no])])])
        !            43:        AS_VAR_IF(gl_Symbol, [yes],
        !            44:          [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_RAW_DECL_$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:     ])
1.1       misho      51: ])