* strange warning in gsl_matrix_float_set
@ 2002-10-15 2:04 Ivo Alxneit
0 siblings, 0 replies; 4+ messages in thread
From: Ivo Alxneit @ 2002-10-15 2:04 UTC (permalink / raw)
To: GSL-discuss
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i have a wired problem. independently of wether i declare val as float or as double
i get the warning below for the following code:
#include <stdio.h>
#include <gsl/gsl_matrix_float.h>
void read_as_int(gsl_matrix_float *m, size_t n1, size_t n2)
{
int c1, c2;
double val; /* or float val */
size_t i, j;
for(i=0; i< n1; i++) {
for(j=0; j<n2; j++) {
c1=fgetc(stdin);
c2=fgetc(stdin);
val=c1 + 256.0*c2;
gsl_matrix_float_set(m, i, j, val);
}
}
}
gcc -O2 -march=i386 -mcpu=i686 -pipe -pedantic -Wall -W -Wmissing-prototypes
-Wstrict-prototypes -Wtraditional -Wconversion -Wshadow -Wpointer-arith
-Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common -Wnested-externs
-Dinline= -g -I/usr/X11R6/include -Dlinux -D__i386__ -D_POSIX_C_SOURCE=199309L
-D_POSIX_SOURCE -D_XOPEN_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -DFUNCPROTO=15 -DNARROWPROTO
-c -o read_as_int.o read_as_int.c
read_as_int.c: In function `read_as_int':
read_as_int.c:14: warning: passing arg 4 of `gsl_matrix_float_set' as `float' rather
than `double' due to prototype
rm -f lav2pnm
gcc -o lav2pnm -O2 -march=i386 -mcpu=i686 -pipe -pedantic -Wall -W -Wmissing-prototypes
-Wstrict-prototypes -Wtraditional -Wconversion -Wshadow -Wpointer-arith
-Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common -Wnested-externs
-Dinline= -g -L/usr/X11R6/lib lav2pnm.o read_as_int.o write_pgm.o
write_ppm.o HSV_to_RGB.o help.o -lgsl -lgslcblas -lm
what am i doing wrong here?
--
Dr. Ivo Alxneit
Laboratory for Solar Technology phone: +41 56 310 4092
CH-5232 Villigen fax: +41 56 310 2624
Paul Scherrer Institute http://solar.web.psi.ch
Switzerland gnupg key: 0x515E30C7
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: strange warning in gsl_matrix_float_set
[not found] ` <E182QR9-0005gW-00@ultra16.uk2net.com>
@ 2002-10-20 6:06 ` Brian Gough
0 siblings, 0 replies; 4+ messages in thread
From: Brian Gough @ 2002-10-20 6:06 UTC (permalink / raw)
To: Ivo Alxneit; +Cc: gsl-discuss
Ivo Alxneit writes:
> well according to the mainual -Wconversion deals with warnings due to
> signed/unsigned variables. i get a waring due to float/double even
> though the prototype in gsl_matrix_float.h is
`-Wconversion'
Warn if a prototype causes a type conversion that is different
from what would happen to the same argument in the absence of a
prototype.
In the absence of a prototype float is promoted to double, as in the
old K&R C, hence the warning. The float/double warning always occurs
with -Wconversion, so I only use that option for occassional checks.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: strange warning in gsl_matrix_float_set
2002-10-15 15:06 ` Brian Gough
@ 2002-10-17 23:16 ` Ivo Alxneit
[not found] ` <E182QR9-0005gW-00@ultra16.uk2net.com>
1 sibling, 0 replies; 4+ messages in thread
From: Ivo Alxneit @ 2002-10-17 23:16 UTC (permalink / raw)
To: bjg; +Cc: GSL-discuss
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On 15 Oct, Brian Gough wrote:
> Ivo Alxneit writes:
>
> > gcc -O2 -march=i386 -mcpu=i686 -pipe -pedantic -Wall -W -Wmissing-prototypes
> > -Wstrict-prototypes -Wtraditional -Wconversion -Wshadow -Wpointer-arith
> > -Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common -Wnested-externs
> > -Dinline= -g -I/usr/X11R6/include -Dlinux -D__i386__ -D_POSIX_C_SOURCE=199309L
> > -D_POSIX_SOURCE -D_XOPEN_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -DFUNCPROTO=15 -DNARROWPROTO
> > -c -o read_as_int.o read_as_int.c
> > read_as_int.c: In function `read_as_int':
> > read_as_int.c:14: warning: passing arg 4 of `gsl_matrix_float_set' as `float' rather
> > than `double' due to prototype
>
> See the section on -Wconversion in the GCC Manual for a description of
> the warning.
well according to the mainual -Wconversion deals with warnings due to
signed/unsigned variables. i get a waring due to float/double even
though the prototype in gsl_matrix_float.h is
void gsl_matrix_float_set(gsl_matrix_float * m, const size_t i, const
size_t j, const float x);
i.e. const float for the fourth argument. gcc sees a double in the
prototype. am i really supposed to use a cast to get rid of the warning?
--
Dr. Ivo Alxneit
Laboratory for Solar Technology phone: +41 56 310 4092
CH-5232 Villigen fax: +41 56 310 2624
Paul Scherrer Institute http://solar.web.psi.ch
Switzerland gnupg key: 0x515E30C7
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: strange warning in gsl_matrix_float_set
[not found] <E181NdC-00048U-00@ultra16.uk2net.com>
@ 2002-10-15 15:06 ` Brian Gough
2002-10-17 23:16 ` Ivo Alxneit
[not found] ` <E182QR9-0005gW-00@ultra16.uk2net.com>
0 siblings, 2 replies; 4+ messages in thread
From: Brian Gough @ 2002-10-15 15:06 UTC (permalink / raw)
To: Ivo Alxneit; +Cc: GSL-discuss
Ivo Alxneit writes:
> gcc -O2 -march=i386 -mcpu=i686 -pipe -pedantic -Wall -W -Wmissing-prototypes
> -Wstrict-prototypes -Wtraditional -Wconversion -Wshadow -Wpointer-arith
> -Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common -Wnested-externs
> -Dinline= -g -I/usr/X11R6/include -Dlinux -D__i386__ -D_POSIX_C_SOURCE=199309L
> -D_POSIX_SOURCE -D_XOPEN_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE -DFUNCPROTO=15 -DNARROWPROTO
> -c -o read_as_int.o read_as_int.c
> read_as_int.c: In function `read_as_int':
> read_as_int.c:14: warning: passing arg 4 of `gsl_matrix_float_set' as `float' rather
> than `double' due to prototype
See the section on -Wconversion in the GCC Manual for a description of
the warning.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2002-10-15 2:04 strange warning in gsl_matrix_float_set Ivo Alxneit
[not found] <E181NdC-00048U-00@ultra16.uk2net.com>
2002-10-15 15:06 ` Brian Gough
2002-10-17 23:16 ` Ivo Alxneit
[not found] ` <E182QR9-0005gW-00@ultra16.uk2net.com>
2002-10-20 6:06 ` Brian Gough
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