diff options
Diffstat (limited to 'src/lisp.h')
| -rw-r--r-- | src/lisp.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/lisp.h b/src/lisp.h index 1a8c3a0fe49..78843483edc 100644 --- a/src/lisp.h +++ b/src/lisp.h @@ -233,7 +233,9 @@ extern bool suppress_checking EXTERNALLY_VISIBLE; enum Lisp_Bits { - GCALIGNMENT = 1 << GCTYPEBITS, + /* 2**GCTYPEBITS. This must be a macro that expands to a literal + integer constant, for older versions of GCC (through at least 4.9). */ +#define GCALIGNMENT 8 /* Number of bits in a Lisp_Object value, not counting the tag. */ VALBITS = EMACS_INT_WIDTH - GCTYPEBITS, @@ -245,6 +247,10 @@ enum Lisp_Bits FIXNUM_BITS = VALBITS + 1 }; +#if GCALIGNMENT != 1 << GCTYPEBITS +# error "GCALIGNMENT and GCTYPEBITS are inconsistent" +#endif + /* The maximum value that can be stored in a EMACS_INT, assuming all bits other than the type bits contribute to a nonnegative signed value. This can be used in #if, e.g., '#if USE_LSB_TAG' below expands to an |