[cfe-dev] clang PCH and strace

[dawn at burble.org]

Yup, that was it.  (Doh!)  Thanks.
-Dawn

On Wed, Sep 29, 2010 at 12:08:15AM +0200, Jean-Daniel Dupas wrote:
> 
> Le 28 sept. 2010 à 23:06, Sebastian Redl a écrit :
> 
> > 
> > On Sep 28, 2010, at 1:59 PM, dawn at burble.org wrote:
> > 
> >> Why would strace (on Linux) cause clang to fail to read a PCH? :
> >> 
> >> 1. $ clang -cc1 -emit-pch -I/tmp/ /tmp/m.h -o m.pch
> >>  $ clang -cc1 -include-pch m.pch -I/tmp/ /tmp/m.c
> >> 
> >> 2. $ clang -cc1 -emit-pch -I/tmp/ /tmp/m.h -o m.pch
> >>  $ strace -o bla -e open clang -cc1 -include-pch m.pch -I/tmp/ /tmp/m.c
> >>  error: PCH file uses a newer PCH format that cannot be read
> >>  1 error generated.
> >> 
> >> 1st command works, 2nd command (with strace) fails.
> > 
> > I give you a 99% probability of the strace command picking up a different clang executable.
> 
> 
> You can confirm that by doing
> 
> strace clang --version
> 
> and 
> 
> clang --version
> 
> -- Jean-Daniel
> 
> 
>