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Re: Race condition during ncurses installation

From: Thomas Dickey
Subject: Re: Race condition during ncurses installation
Date: Sat, 12 Mar 2016 14:14:01 -0500
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Mar 11, 2016 at 11:20:25PM +0000, Bystricky, Juro wrote:
> Hello ncurses maintainers,
> There is a race condition using parallel make installing ncurses when 
> installing explicit targets:
> make install.libs install.includes
> Both targets install identicall files, often resulting in an error such as :
> /usr/bin/install: cannot create regular file 
> '/data/master-ab/poky/build-ab/tmp/work/core2-64-poky-linux/ncurses/6.0+20160213-r0/image/usr/include/termcap.h':
>  File exists
> The race is relatively easy to fix, i.e. add statement such as
> .NOTPARALLEL install.libs install.includes

I don't see that here:


(though there is some discussion in the rationale which may be helpful)

> in the file mk-hdr.awk
> While this would prevent the race, several identical files would be still
> installed twice (still assuming installing via "make install.libs 
> install.includes ").
> Is it fair to assume install.libs is a superset of install.includes?

Something like that - it's not changed for a long time: the description
of both in INSTALL was written in 1994.

> In other words, is
> make install.libs
> meant to be an equivalent to:
> make install.libs install.includes
> BTW, I should mention that "make install.libs install.includes" has been used 
> in Yocto ncurses recipes
> for years (instead of a generic "make install") in order to better granulate 
> installed ncurses components.

I understand that :-)

Thomas E. Dickey <address@hidden>

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