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Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 6f4b3d51c8..20b149f58e 100644 --- a/configure.ac +++ b/configure.ac @@ -3145,6 +3145,32 @@ case $opsys in ;; esac +dnl Used in vm-limit.c +AH_TEMPLATE(DATA_START, [Address of the start of the data segment.]) +dnl Used in lisp.h, emacs.c, mem-limits.h +dnl NEWS.18 describes this as "a number which contains +dnl the high bits to be inclusive or'ed with pointers that are unpacked." +AH_TEMPLATE(DATA_SEG_BITS, [Extra bits to be or'd in with any pointers +stored in a Lisp_Object.]) +dnl if Emacs uses fewer than 32 bits for the value field of a LISP_OBJECT. + +case $opsys in + gnu) + dnl libc defines data_start. + AC_DEFINE(DATA_START, [({ extern int data_start; (char *) &data_start; })]) + ;; + + hpux*) + dnl The data segment on this machine always starts at address 0x40000000. + AC_DEFINE(DATA_START, [0x40000000]) + AC_DEFINE(DATA_SEG_BITS, [0x40000000]) + ;; + irix6-5) + AC_DEFINE(DATA_START, [0x10000000]) + AC_DEFINE(DATA_SEG_BITS, [0x10000000]) + ;; +esac + case $opsys in gnu-kfreebsd) opsysfile="s/gnu-linux.h" ;; |