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cpp.texi (Obsolete Features): Add background on the origin of assertions.

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* doc/cpp.texi (Obsolete Features): Add background on the
	origin of assertions.

From-SVN: r170261
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Gerald Pfeifer 2011-02-18 00:10:26 +00:00 committed by Gerald Pfeifer
parent d764a8e6bd
commit f73c888214
2 changed files with 9 additions and 3 deletions
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@ -1,3 +1,8 @@
2011-02-18 Gerald Pfeifer <gerald@pfeifer.com>
* doc/cpp.texi (Obsolete Features): Add background on the
origin of assertions.
2011-02-17 Iain Sandoe <iains@gcc.gnu.org>
* config/darwin-c.c (darwin_cpp_builtins): Define __OBJC2__ for

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gcc/doc/cpp.texi
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@ -4200,9 +4200,10 @@ program will run on. Assertions are usually predefined, but you can
define them with preprocessing directives or command-line options.
Assertions were intended to provide a more systematic way to describe
the compiler's target system. However, in practice they are just as
unpredictable as the system-specific predefined macros. In addition, they
are not part of any standard, and only a few compilers support them.
the compiler's target system and we added them for compatibility with
existing compilers. In practice they are just as unpredictable as the
system-specific predefined macros. In addition, they are not part of
any standard, and only a few compilers support them.
Therefore, the use of assertions is @strong{less} portable than the use
of system-specific predefined macros. We recommend you do not use them at
all.