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Compilation flags with GCC 2.8.1
- To: help-gcc at gnu dot org
- Subject: Compilation flags with GCC 2.8.1
- From: tex_tarro at hotmail dot com
- Date: Tue, 05 Oct 1999 09:32:16 GMT
- Newsgroups: gnu.gcc.help
- Organization: Deja.com - Before you buy.
- Xref: wodc7nx0 gnu.gcc.help:1277
We developed one application using HP-UX 10.20 proprietary C compiler.
Now we are trying compile it using GCC 2.8.1 and we found a problem
with
compilation flags.
HP compiler has +u1 flag we didn't find in GCC compiler.
This option is vital for our code. In fact, skipping it cause the core
dump of
our application.
If you would like, try the following example:
1) Use the following file mappa.c
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#define file "systabina.txt"
main()
{
void *p_map=NULL;
off_t fsize, pagesize;
int boot_fd = -1, i;
void *temp = NULL;
char *temp_c = NULL;
short *temp_i = NULL;
if ((boot_fd=open(file, O_RDWR)) < 0)
printf("Error in file openening\n");
fsize = lseek(boot_fd, 0, SEEK_END);
if(fsize <0)
printf("ERRORE fsize <0\n");
pagesize = sysconf(_SC_PAGE_SIZE);
p_map = (void *) mmap (NULL,
fsize,
(PROT_READ|PROT_WRITE),
(MAP_FILE|MAP_VARIABLE|MAP_SHARED),
boot_fd,0);
if ( p_map == (void *)-1)
printf("Error in file mapping\n");
temp_c = ((char *)p_map) + 1;
printf("char num. 2 = %c\n", *temp_c);
temp_i = (short *) ((char *) p_map+1);
printf("short = %hd\n", *temp_i);
}
This code accesses a txt file, called systabina.txt, one line long
that is:
Questo file ha lo scopo di determinare eventuali problemi di memory
fault
2) Compile it using HP compiler in this way:
%> cc +u1 -o mappa mappa.c
3) Run mappa and obtain the following result:
%> mappa
char num. 2 = u
short = 30053
4) Now compile it without +u1 flag and run it
%> cc -o mappa mappa.c
%> mappa
char num. 2 = u
(Bus error core dumped)
5) If you try with gcc you obtain the same result:
%> gcc -o mappa mappa.c
%> mappa
char num. 2 = u
(Bus error core dumped)
We would like to find the correspondent flag +u1 for gcc or adding a
define in the code as workaround. We cannot strongly modify the code.
I mean each structure or similar.
Can someone help us?
Thank you
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