This is the mail archive of the crossgcc@sourceware.org mailing list for the crossgcc project.
See the CrossGCC FAQ for lots more information.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
Hello List, I'm seeing an alignment issue when I'm incrementing a pointer. Using the program below I found that the cross compiler I built from crosstools-ng-1.13.3, interprets the "*(ptr + 1)" as adding 1 BYTE to ptr. It should know that ptr is declared as a pointer to an integer and interpret "*(ptr + 1)" as adding 4 BYTES to ptr. An older cross compiler from Technologics, crosstool-linux-gnueabi-2005q3-2, doesn't exhibit this problem and interprets the pointer addition correctly. So does the native gcc on the target. I would prefer to use crosstools-ng. The target is a Technologics TS-7350 ARM920T (EP9302). I'm wondering if there may be something I haven't set properly in the crosstool-ng's configuration? The configuration file I'm using can be seen here: ??? http://home.comcast.net/~n1gp/ct_config PROGRAM: #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> int main() { ??????? unsigned char buffer[8], i; ??????? int *ptr = (int *) buffer; ??????? printf("size of int is: %d\n", sizeof(int)); ??????? memset(buffer, 0xff, sizeof buffer); ??????? *(ptr + 1) = 0x1234; ??????? for (i=0; i<(sizeof(buffer) +1); i++) ??????????????? printf("buffer[%d]=%x\n", i, buffer[i]); } RESULTS WITH crosstool-linux-gnueabi-2005q3-2: size of int is: 4 buffer[0]=ff buffer[1]=ff buffer[2]=ff buffer[3]=ff buffer[4]=34 buffer[5]=12 buffer[6]=0 buffer[7]=0 buffer[8]=0 RESULTS WITH crosstools-ng: size of int is: 4 buffer[0]=ff buffer[1]=34 buffer[2]=12 buffer[3]=0 buffer[4]=0 buffer[5]=ff buffer[6]=ff buffer[7]=ff buffer[8]=8 Thanks, Rick -- For unsubscribe information see http://sourceware.org/lists.html#faq
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |