On Wed, 22 Jan 2020 11:34:29 +0100, "R.Wieser" 
declaimed the following:

>Hello all,
>
>I've found a simple tutorial here
>http://www.linuxjournal.com/article/6735?page=0,0 and have a bit of a
>problem with listing #3.
>
>First off , when I executed the program it had a long delay executing the
>"snd_pcm_hw_params_set_rate_near()" function, which turned out to be related
>to the "dir" argument not being initialised (with Zero).
>
>#1: I'm using gcc on a Raspberry Pi in geany.  Is there some sort of setting
>I should add to have gcc include code to automatically clear declared
>variables ?
>
>Or should I assume that the code simply isn't complete (would explain a few
>things).
>

 Well, you could add compile option

-Wuninitialized
"""
Warn if an automatic variable is used without first being initialized.
"""

and find most of those conditions. NOTE that there likely isn't any option
to force memory to 0 on first usage since so much of C is stack based and
zeroing stack memory each time a function returns (shrinking the stack)
would be a costly overhead... cf:
https://stackoverflow.com/questions/10526602/is-there-a-gcc-flag-to-initialise-
local-variable-storage
"""
C99: If an object that has automatic storage duration is not initialized
explicitly, its value is indeterminate.
"""


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/

--- SoupGate-Win32 v1.05