[petsc-dev] bug in BuildSystem check

[Barry Smith]

  Matt,

   In the test for isinf() the compile warns about lack of prototype. 
BuildSystem should stop at this point and NOT set HAVE_ISINF. Could you please 
fix this?

    Thanks

     Barry



sh: gcc -c -o conftest.o  -Wall -Wwrite-strings -Wno-strict-aliasing -g3  
conftest.c 
Executing: gcc -c -o conftest.o  -Wall -Wwrite-strings -Wno-strict-aliasing -g3 
 conftest.c 
sh: 
Possible ERROR while running compiler: error message = {conftest.c: In function 
'main':
conftest.c:6: warning: implicit declaration of function 'isinf'
conftest.c:6: warning: unused variable 'a'
}
Source:
#include "confdefs.h"
#include "conffix.h"
#include <math.h>

int main() {
double b = 2.0; int a = isinf(b);
;
  return 0;
}
                Pushing language C
                Popping language C
sh: gcc  -o conftest    -Wall -Wwrite-strings -Wno-strict-aliasing -g3  
conftest.o -L/opt/local/lib/gcc/sparc-sun-solaris2.10/4.4.1 
-L/opt/local/lib/gcc -L/usr/ccs/lib -L/opt/local/lib -ldl -lgcc_eh -ldl  
-lsocket -lnsl
Executing: gcc  -o conftest    -Wall -Wwrite-strings -Wno-strict-aliasing -g3  
conftest.o -L/opt/local/lib/gcc/sparc-sun-solaris2.10/4.4.1 
-L/opt/local/lib/gcc -L/usr/ccs/lib -L/opt/local/lib -ldl -lgcc_eh -ldl  
-lsocket -lnsl
sh: 
        Defined "HAVE_ISINF" to "1"