tools-for-build/where-is-mcontext.c

   1 /*
   2  * Find the offset of uc_mcontext in a ucontext structure, to enable
   3  * building on both (glibc-2.3.1 and earlier) and (glibc-2.3.2 and
   4  * later), after the glibc developers broke source code compatibility.
   5  * (see also Debian bugs #207806 and #209074)
   6  */
   7
   8 /*
   9  * This software is part of the SBCL system. See the README file for
  10  * more information.
  11  *
  12  * While most of SBCL is derived from the CMU CL system, many
  13  * utilities for the build process (like this one) were written from
  14  * scratch after the fork from CMU CL.
  15  *
  16  * This software is in the public domain and is provided with
  17  * absolutely no warranty. See the COPYING and CREDITS files for
  18  * more information.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include <sys/ucontext.h>
  25
  26 int main (int argc, char *argv[]) {
  27
  28     if(argc != 1) {
  29         fprintf(stderr,"%s: command line arguments provided.  Don't do that.\n", argv[0]);
  30         exit(1);
  31     }
  32
  33     printf("\
  34 /* This is an automatically-generated file; please do not edit it.\n\
  35    See the program tools-for-build/where-is-mcontext.c.\n\
  36  */\n\n");
  37
  38     printf("\
  39 #ifndef PPC_LINUX_MCONTEXT_H\n\
  40 #define PPC_LINUX_MCONTEXT_H\n\n");
  41
  42     if (offsetof(ucontext_t,uc_mcontext) > 40) {
  43         printf("#define GLIBC232_STYLE_UCONTEXT\n\n");
  44     } else {
  45         printf("#define GLIBC231_STYLE_UCONTEXT\n\n");
  46     }
  47     printf("\
  48 #endif /* PPC_LINUX_MCONTEXT_H */\n");
  49     exit(0);
  50 }
  51