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Clarify -fcheck-memory-usage

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From-SVN: r26057
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Craig Burley 1999-03-29 12:13:17 +00:00 committed by Craig Burley
parent fdb1833aca
commit d311103760
2 changed files with 16 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Mar 29 15:11:10 1999 Craig Burley <craig@jcb-sc.com>
* invoke.texi (Code Gen Options): Attempt to clarify
-fcheck-memory-usage. Minor edits to -fprefix-function-name.
Mon Mar 29 20:52:47 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* loop.c (maybe_eliminate_biv): For libcalls that set a giv, skip to

18
gcc/invoke.texi
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@ -6060,17 +6060,22 @@ Generate extra code to check each memory access. GNU CC will generate
code that is suitable for a detector of bad memory accesses such as
@file{Checker}.
You must also specify this option when you compile functions you call that
have side effects. If you do not, you may get erroneous messages from
the detector. Normally, you should compile all your code with this option.
Normally, you should compile all, or none, of your code with this option.
If you do mix code compiled with and without this option,
you must ensure that all code that has side effects
and that is called by code compiled with this option
is, itself, compiled with this option.
If you do not, you might get erroneous messages from the detector.
If you use functions from a library that have side-effects (such as
@code{read}), you may not be able to recompile the library and
@code{read}), you might not be able to recompile the library and
specify this option. In that case, you can enable the
@samp{-fprefix-function-name} option, which requests GNU CC to encapsulate
your code and make other functions look as if they were compiled with
@samp{-fcheck-memory-usage}. This is done by calling ``stubs'',
which are provided by the detector. If you cannot find or build
stubs for every function you call, you may have to specify
stubs for every function you call, you might have to specify
@samp{-fcheck-memory-usage} without @samp{-fprefix-function-name}.
If you specify this option, you can not use the @code{asm} or
@ -6095,7 +6100,7 @@ These calls would be similar to those done in the stubs described above.
Request GNU CC to add a prefix to the symbols generated for function names.
GNU CC adds a prefix to the names of functions defined as well as
functions called. Code compiled with this option and code compiled
without the option can't be linked together, unless or stubs are used.
without the option can't be linked together, unless stubs are used.
If you compile the following code with @samp{-fprefix-function-name}
@example
@ -6104,7 +6109,6 @@ void
foo (int a)
@{
return bar (a + 5);
@}
@end example