From: Martin Sebor <msebor@gmail.com>
To: Stephan Gatzka <stephan.gatzka@gmail.com>, gcc-help@gcc.gnu.org
Subject: Re: parameter type of -frandom-seed
Date: Tue, 25 Aug 2015 23:42:00 -0000 [thread overview]
Message-ID: <55DCFD7A.3090609@gmail.com> (raw)
In-Reply-To: <1440521295.3861.3.camel@gmail.com>
On 08/25/2015 10:48 AM, Stephan Gatzka wrote:
> Hi!
>
> I'm a bit confused about the parameter I have to deliver to -frandom
> -seed.
>
> My manual page states it must be a number, others say it's a string.
>
> If I browse through the sources of gcc, it's also not not obvious to me.
>
> https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/common.opt;hb=HEAD
>
> https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/po/de.po;hb=HEAD
>
> So what's the correct parameter ffor -frandom-seed? A number
> (decimal/hex) or a string?
According to the online manual for the latest GCC it's supposed to
be a non-negative number:
$ gcc -v --help 2>&1 | grep random-seed
-frandom-seed This switch lacks documentation
-frandom-seed=<number> Make compile reproducible using <number>
but it looks like there's a bug in the option's specification that
prevents invalid (non-numeric) arguments from being diagnosed, making
GCC accept anything (including negative numbers).
The otherwise untested patch below fixes it for me and makes GCC
accept only non-negative numbers.
A bug should probably be filed for this.
Martin
diff --git a/gcc/common.opt b/gcc/common.opt
index 4dcd518..4776d1f 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1868,7 +1868,7 @@ frandom-seed
Common Var(common_deferred_options) Defer
frandom-seed=
-Common Joined RejectNegative Var(common_deferred_options) Defer
+Common Joined RejectNegative UInteger Var(common_deferred_options) Defer
-frandom-seed=<number> Make compile reproducible using <number>
; This switch causes the command line that was used to create an
next prev parent reply other threads:[~2015-08-25 23:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-25 16:48 Stephan Gatzka
2015-08-25 23:42 ` Martin Sebor [this message]
2015-08-27 5:36 ` Stephan Gatzka
2015-08-27 15:31 ` Martin Sebor
2015-08-27 18:16 ` Stephan Gatzka
2015-09-01 17:33 ` Martin Sebor
2015-09-01 18:31 ` Stephan Gatzka
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