From 7b1da5a4bf287395e2ae49e70096b2b6ebd45728 Mon Sep 17 00:00:00 2001 From: Bruno Haible Date: Sat, 30 May 2009 16:56:40 +0200 Subject: Produce a compiler independent . --- lib/Makefile.am | 25 ++++++++++---- lib/stdbool.mini.h | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 117 insertions(+), 7 deletions(-) create mode 100644 lib/stdbool.mini.h (limited to 'lib') diff --git a/lib/Makefile.am b/lib/Makefile.am index 0e07e6b..5b322b9 100644 --- a/lib/Makefile.am +++ b/lib/Makefile.am @@ -60,16 +60,27 @@ nobase_nodist_include_HEADERS = \ unistring/stdbool.h \ unistring/stdint.h +# Produce an unistring/stdbool.h that is not compiler dependent. +# GCC >= 2.95 has . +# AIX >= 5.3 has . +# Solaris 10 and some HP-UX 11 versions have but it does not +# necessarily work. unistring/stdbool.h : $(STDBOOL_H) @MKDIR_P@ unistring rm -f $@-t $@ - if test -n '$(STDBOOL_H)'; then \ - cp stdbool.h $@-t; \ - else \ - { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \ - echo '#include '; \ - } > $@-t; \ - fi + { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \ + echo '#if !defined _GL_STDBOOL_H'; \ + if test -f /usr/include/stdbool.h; then \ + echo '#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)) || defined _AIX'; \ + else \ + echo '#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95))'; \ + fi; \ + echo '#include '; \ + echo '#else'; \ + cat $(srcdir)/stdbool.mini.h; \ + echo '#endif'; \ + echo '#endif'; \ + } > $@-t mv $@-t $@ BUILT_SOURCES += unistring/stdbool.h MOSTLYCLEANFILES += unistring/stdbool.h-t diff --git a/lib/stdbool.mini.h b/lib/stdbool.mini.h new file mode 100644 index 0000000..285f80c --- /dev/null +++ b/lib/stdbool.mini.h @@ -0,0 +1,99 @@ +/* Copyright (C) 2001-2003, 2006-2009 Free Software Foundation, Inc. + Written by Bruno Haible , 2001. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#ifndef _UNISTRING_STDBOOL_H +#define _UNISTRING_STDBOOL_H + +/* ISO C 99 for platforms that lack it. */ + +/* Usage suggestions: + + Programs that use should be aware of some limitations + and standards compliance issues. + + Standards compliance: + + - must be #included before 'bool', 'false', 'true' + can be used. + + - You cannot assume that sizeof (bool) == 1. + + - Programs should not undefine the macros bool, true, and false, + as C99 lists that as an "obsolescent feature". + + Limitations of this substitute, when used in a C89 environment: + + - must be #included before the '_Bool' type can be used. + + - You cannot assume that _Bool is a typedef; it might be a macro. + + - Bit-fields of type 'bool' are not supported. Portable code + should use 'unsigned int foo : 1;' rather than 'bool foo : 1;'. + + - In C99, casts and automatic conversions to '_Bool' or 'bool' are + performed in such a way that every nonzero value gets converted + to 'true', and zero gets converted to 'false'. This doesn't work + with this substitute. With this substitute, only the values 0 and 1 + give the expected result when converted to _Bool' or 'bool'. + + Also, it is suggested that programs use 'bool' rather than '_Bool'; + this isn't required, but 'bool' is more common. */ + + +/* 7.16. Boolean type and values */ + +/* For the sake of symbolic names in gdb, we define true and false as + enum constants, not only as macros. + It is tempting to write + typedef enum { false = 0, true = 1 } _Bool; + so that gdb prints values of type 'bool' symbolically. But if we do + this, values of type '_Bool' may promote to 'int' or 'unsigned int' + (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int' + (see ISO C 99 6.3.1.1.(2)). So we add a negative value to the + enum; this ensures that '_Bool' promotes to 'int'. */ +#if defined __cplusplus + /* Assume the compiler has 'bool' and '_Bool'. */ +#else + /* If @HAVE__BOOL@: + Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when + the built-in _Bool type is used. See + http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html + http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html + http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html + Similar bugs are likely with other compilers as well; this file + wouldn't be used if was working. + So we override the _Bool type. + If !@HAVE__BOOL@: + Need to define _Bool ourselves. As 'signed char' or as an enum type? + Use of a typedef, with SunPRO C, leads to a stupid + "warning: _Bool is a keyword in ISO C99". + Use of an enum type, with IRIX cc, leads to a stupid + "warning(1185): enumerated type mixed with another type". + Even the existence of an enum type, without a typedef, + "Invalid enumerator. (badenum)" with HP-UX cc on Tru64. + The only benefit of the enum, debuggability, is not important + with these compilers. So use 'signed char' and no enum. */ +# define _Bool signed char +#endif +#define bool _Bool + +/* The other macros must be usable in preprocessor directives. */ +#define false 0 +#define true 1 +#define __bool_true_false_are_defined 1 + +#endif /* _UNISTRING_STDBOOL_H */ -- cgit v1.2.1