Re: problem while building arm vfp softfloat gcc

[Robert Schwebel <robert at schwebel dot de>]

Dan, 

gcc-3.3.2 with glibc-2.3.2 seem to have problems with printf and
floating point anyway. Look at this test case: 

----------8<----------
#include <stdio.h>

int main (void)
{
	float f = 1.0;
	double d = 1.0;
	long double ld = 1.0;
	
	printf ("Without cast:\n");
	printf ("float:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", f, f, f);
	printf ("double:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", d, d, d);
	printf ("long double:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", ld, ld, ld);
	
	printf ("With cast:\n");
	printf ("float:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", (float) f, (double) f, (long double) f);
	printf ("double:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", (float) d, (double) d, (long double) d);
	printf ("long double:\n");
	printf ("f : %f\nlf: %lf\nLf: %Lf\n", (float) ld, (double) ld, (long double) ld);
	return 0;
}
----------8<----------

Compiled with vanilla Debian gcc-3.3.2 on x86: 

$ gcc -W -Wall test.c -o test_float
test.c: In Funktion main:
test.c:11: Warnung: long double Format, double Argument (Argument 4)
test.c:13: Warnung: long double Format, double Argument (Argument 4)
test.c:15: Warnung: double Format, long double Argument (Argument 2)
test.c:15: Warnung: double Format, long double Argument (Argument 3)

$ ./test_float 
Without cast:
float:
f : 1.000000
lf: 1.000000
Lf: 0.000000
double:
f : 1.000000
lf: 1.000000
Lf: 0.000000
long double:
f : -0.000000
lf: 0.000000
Lf: 0.000000
With cast:
float:
f : 1.000000
lf: 1.000000
Lf: 1.000000
double:
f : 1.000000
lf: 1.000000
Lf: 1.000000
long double:
f : 1.000000
lf: 1.000000
Lf: 1.000000

Nice ;-)

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
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