diff options
Diffstat (limited to 'm4/flexmember.m4')
| -rw-r--r-- | m4/flexmember.m4 | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/m4/flexmember.m4 b/m4/flexmember.m4 index 1347068..90f3ddd 100644 --- a/m4/flexmember.m4 +++ b/m4/flexmember.m4 @@ -1,7 +1,7 @@ # serial 5 # Check for flexible array member support. -# Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc. +# Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. @@ -34,12 +34,10 @@ AC_DEFUN([AC_C_FLEXIBLE_ARRAY_MEMBER], AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [], [Define to nothing if C supports flexible array members, and to 1 if it does not. That way, with a declaration like 'struct s - { int n; double d@<:@FLEXIBLE_ARRAY_MEMBER@:>@; };', the struct hack + { int n; short d@<:@FLEXIBLE_ARRAY_MEMBER@:>@; };', the struct hack can be used with pre-C99 compilers. - When computing the size of such an object, don't use 'sizeof (struct s)' - as it overestimates the size. Use 'offsetof (struct s, d)' instead. - Don't use 'offsetof (struct s, d@<:@0@:>@)', as this doesn't work with - MSVC and with C++ compilers.]) + Use 'FLEXSIZEOF (struct s, d, N * sizeof (short))' to calculate + the size in bytes of such a struct containing an N-element array.]) else AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [1]) fi |