[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: isinf and type-pun warning/error on OSF guile 1.8.7
From: |
Andy Wingo |
Subject: |
Re: isinf and type-pun warning/error on OSF guile 1.8.7 |
Date: |
Thu, 10 Jun 2010 00:28:00 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux) |
Hi Jay,
On Wed 09 Jun 2010 17:43, Jay K <address@hidden> writes:
> libtool: compile: gcc -DHAVE_CONFIG_H -I.. -I/home/jayk/src/guile-1.8.7 -I..
> -mieee -mieee -D_REENTRANT -pthread -g -O2 -Wall -Wmissing-prototypes -Werror
> -MT libguile_la-numbers.lo -MD -MP -MF .deps/libguile_la-numbers.Tpo -c
> /home/jayk/src/guile-1.8.7/libguile/numbers.c -DPIC -o
> .libs/libguile_la-numbers.o
> cc1: warnings being treated as errors
> /home/jayk/src/guile-1.8.7/libguile/numbers.c: In function 'xisinf':
> /home/jayk/src/guile-1.8.7/libguile/numbers.c:144: error: implicit
> declaration of function 'isinf'
> I couldn't find isinf in any header.
This call only occurs if configure detected support `isinf', so surely
it is there? Can you check again? Barring that can you send a
config.log, please.
> /home/jayk/src/guile-1.8.7/libguile/numbers.c: In function 'guile_ieee_init':
> /home/jayk/src/guile-1.8.7/libguile/numbers.c:623: error: dereferencing
> type-punned pointer will break strict-aliasing rules
> /home/jayk/src/guile-1.8.7/libguile/numbers.c:654: error: dereferencing
> type-punned pointer will break strict-aliasing rules
Does replacing that DINIFINITY block with the following help?
/* OSF */
extern unsigned int DINFINITY[2];
union
{
double d;
int i[2];
} alias;
alias.i[0] = DINFINITY[0];
alias.i[1] = DINFINITY[1];
guile_Inf = alias.d;
Likewise for DQNAN:
{
/* OSF */
extern unsigned int DQNAN[2];
union
{
double d;
int i[2];
} alias;
alias.i[0] = DQNAN[0];
alias.i[1] = DQNAN[1];
guile_NaN = alias.d;
}
> I recall seeing the same problem on Irix, where autoconf does a link check
> and compiles without -Wmissing-prototype so it passes, because the function
> does exist somewhere. Autoconf checks need to more closely resemble
> how later compilation will occur.
How does that work though -- does isinf have no header/declaration?
> /home/jayk/src/guile-1.8.7/test-suite/standalone/test-conversion.c:859:
> error: dereferencing type-punned pointer will break strict-aliasing
> rules make[4]: *** [test_conversion-test-conversion.o] Error 1
We can copy the above solution if it works. Let us know!
Andy
--
http://wingolog.org/