From: "Christian Häggström" <97nv46@skola.kiruna.se>
To: <J.A.K.Mouw@its.tudelft.nl>
Cc: <gcc@gcc.gnu.org>
Subject: Re: Volatile constants?
Date: Wed, 29 Mar 2000 23:31:00 -0000 [thread overview]
Message-ID: <s8e31eb4.024@ymer> (raw)
/* Okay I forgot the parenthesis, but that was not my point */
The GCC manual says "An Inline Function is As Fast As a Macro",
but when I compile this (as C code), I got error "initializer element is not constant" on
's' initialization.
inline int abs1(int x) {
return x<0 ? -x : x;
}
#define abs2(x) ((x)<0 ? -(x) : (x))
int r = abs1(-7);
int s = abs2(-7);
Is there any option I have to pass?
>I don't get that error message. Here is what my compiler says: ...
Okay you use g++. I use the c compiler.
g++ don t generate an error (not even a warning) for this,
but makes an constructor function, 'static_initialization_and_destruction'-something
That is not what I want and it is NOT as fast as a macro.
>I think you should upgrade to gcc-2.95.2.
I compiled with that version, yes
I ll be glad for any help
next reply other threads:[~2000-03-29 23:31 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-03-29 23:31 Christian Häggström [this message]
2000-03-30 4:21 ` Richard Earnshaw
-- strict thread matches above, loose matches on Subject: below --
2000-04-03 2:33 Christian Häggström
[not found] <s8e49edd.056@ymer>
2000-03-31 3:17 ` Richard Earnshaw
2000-03-31 2:50 Christian Häggström
2000-03-29 4:57 Christian Häggström
2000-03-29 7:41 ` Erik Mouw
2000-03-29 9:53 ` Alasdair Baird
2000-03-29 10:05 ` Erik Mouw
2000-03-29 7:45 ` Kevin Handy
2000-03-29 12:18 ` Andi Kleen
2000-02-22 0:52 Christian Häggström
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