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Diffstat (limited to 'mcon/U/alignbytes.U')
| -rw-r--r-- | mcon/U/alignbytes.U | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/mcon/U/alignbytes.U b/mcon/U/alignbytes.U new file mode 100644 index 0000000..569c25a --- /dev/null +++ b/mcon/U/alignbytes.U @@ -0,0 +1,141 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic License, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic License; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: alignbytes.U,v $ +?RCS: Revision 3.0.1.2 1994/10/29 16:02:28 ram +?RCS: patch36: added ?F: line for metalint file checking +?RCS: +?RCS: Revision 3.0.1.1 1994/05/06 14:25:20 ram +?RCS: patch23: avoid ALIGNBYTES, since it conflicts on NetBSD +?RCS: +?RCS: Revision 3.0 1993/08/18 12:05:23 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:alignbytes: Assert Myread Trylink cat i_inttypes i_limits i_math +?MAKE: -pick add $@ %< +?S:alignbytes: +?S: This variable holds the number of bytes required to align an +?S: arbitrary standard type. Usual values are 2, 4 and 8. +?S:. +?X: This used to be called ALIGNBYTES, but that conflicts with +?X: <machines/param.h> in NetBSD. +?C:MEM_ALIGNBYTES (ALIGNBYTES): +?C: This symbol contains the number of bytes required to align a +?C: double. Usual values are 2, 4 and 8. +?C:. +?H:#define MEM_ALIGNBYTES $alignbytes /**/ +?H:. +?T:alignment result +: check for alignment requirements +echo " " +case "$alignbytes" in +'') + echo "Checking alignment constraints..." >&4 + + for alignment in 8 4 2 1 16 32 error + do + $cat >try.c <<EOCP +#$i_inttypes I_INTTYPES +#ifdef I_INTTYPES +#include <inttypes.h> +#endif +#$i_limits I_LIMITS +#ifdef I_LIMITS +#include <limits.h> +#endif +#$i_math I_MATH +#ifdef I_MATH +#include <math.h> +#endif + +union u { + void *void_ptr; + void (*func_ptr)(void); + char c; + short s; + int i; + long l; + float f; + double d; +#ifdef LLONG_MAX + long long ll; +#else +#warning "LLONG_MAX undefined" +#endif +#if defined(HUGE_VALL) + long double ld; +#else +#warning "HUGE_VALL undefined" +#endif +#ifdef UINT32_MAX + uint32_t u32; +#else +#warning "UINT32_MAX undefined" +#endif +#ifdef UINT16_MAX + uint16_t u16; +#else +#warning "UINT32_MAX undefined" +#endif +#ifdef UINT64_MAX + uint64_t u64; +#else +#warning "UINT64_MAX undefined" +#endif +#ifdef UINTMAX_MAX + uintmax_t m; +#else +#warning "UINTMAX_MAX undefined" +#endif +#ifdef UINTPTR_MAX + uintptr_t up; +#else +#warning "UINTPTR_MAX undefined" +#endif +}; + +struct s { + char a; + union u b; +}; + +#include "static_assert.h" + +int +main(void) +{ + STATIC_ASSERT($alignment == ((sizeof (struct s) - (sizeof (union u))))); + return 0; +} +EOCP + + result='' + set result + eval $trylink + case "$result" in + "$define") break;; + esac + done + + case "$alignment" in + error) dflt='8' + echo "(I can't seem to compile the test program...)" >&4 + ;; + *) dflt=$alignment + ;; + esac +;; +*) dflt="$alignbytes" + ;; +esac +rp="What is the maximum alignment in bytes required for a standard type?" +. ./myread +alignbytes="$ans" + |