Date: Mon, 22 Nov 2010 15:05:24 +0100 From: Erik Cederstrand <erik@cederstrand.dk> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-toolchain@freebsd.org Subject: Re: Clang and -frandom-seed Message-ID: <1F5D7910-3AC6-4ACA-A7C5-EC28B9EABF52@cederstrand.dk> In-Reply-To: <4CE93959.7070600@FreeBSD.org> References: <E135940E-F79C-4DFA-811D-18CCBF3C609E@cederstrand.dk> <4CE06C4F.7000002@FreeBSD.org> <FD61324A-1A22-4731-A563-B0BE8AB93069@cederstrand.dk> <4CE93959.7070600@FreeBSD.org>
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Den 21/11/2010 kl. 16.23 skrev Dimitry Andric:
> On 2010-11-15 11:10, Erik Cederstrand wrote:
>
>> Where in the build scripts would I need to add this flag? Something like:
>>
>> CXXFLAGS += -frandom-seed=${.TARGET}
>
> Rather use:
>
> CXXFLAGS+=-frandom-seed=${.IMPSRC:S/^${.CURDIR}\///}
>
> which is rather contorted, but I see no other way to generate a relative
> path. :)
>
> Also, this generates an empty '-frandom-seed=' option for every command
> that uses CXXFLAGS but isn't a compilation at all, such as most linking
> commands. It is probably not harmful, though.
I added
.ifdef WITH_DETERMINISTIC
CXXFLAGS+=-frandom-seed=\"${.IMPSRC:S/^${.CURDIR}\///}\"
.endif
to lib/clang/clang.build.mk
and "WITH_DETERMINISTIC=true" to src.conf, but apparently the flag isn't being propagated to clang.build.mk. However it is being picked up if I pass it on the command-line:
make WITH_DETERMINISTIC=true buildworld
Why isn't the flag available in clang.build.mk?
Erik
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