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Add -fpack-struct. 

From-SVN: r9275
This commit is contained in:
Michael Meissner 1995-03-31 14:35:03 +00:00
parent 7b09543e23
commit 566cdc73b6
4 changed files with 18 additions and 3 deletions
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2
gcc/Makefile.in
View File

@ -1083,7 +1083,7 @@ convert.o: convert.c $(CONFIG_H) $(TREE_H) flags.h convert.h
tree.o : tree.c $(CONFIG_H) $(TREE_H) flags.h function.h
print-tree.o : print-tree.c $(CONFIG_H) $(TREE_H)
stor-layout.o : stor-layout.c $(CONFIG_H) $(TREE_H) function.h
stor-layout.o : stor-layout.c $(CONFIG_H) $(TREE_H) flags.h function.h
fold-const.o : fold-const.c $(CONFIG_H) $(TREE_H) flags.h
toplev.o : toplev.c $(CONFIG_H) $(TREE_H) $(RTL_H) flags.h input.h \
insn-attr.h xcoffout.h defaults.h output.h

5
gcc/flags.h
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@ -1,5 +1,5 @@
/* Compilation switch flag definitions for GNU CC.
Copyright (C) 1987, 1988, 1994 Free Software Foundation, Inc.
Copyright (C) 1987, 1988, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -334,6 +334,9 @@ extern int flag_verbose_asm;
/* -fgnu-linker specifies use of the GNU linker for initializations.
-fno-gnu-linker says that collect will be used. */
extern int flag_gnu_linker;
/* Tag all structures with __attribute__(packed) */
extern int flag_pack_struct;
/* Other basic status info about current function. */

10
gcc/stor-layout.c
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@ -1,5 +1,5 @@
/* C-compiler utilities for types and variables storage layout
Copyright (C) 1987, 1988, 1992, 1993, 1994 Free Software Foundation, Inc.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -22,6 +22,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "tree.h"
#include "flags.h"
#include "function.h"
#define CEIL(x,y) (((x) + (y) - 1) / (y))
@ -241,6 +242,8 @@ layout_decl (decl, known_align)
DECL_BIT_FIELD_TYPE (decl) = DECL_BIT_FIELD (decl) ? type : 0;
if (maximum_field_alignment != 0)
DECL_ALIGN (decl) = MIN (DECL_ALIGN (decl), maximum_field_alignment);
else if (flag_pack_struct)
DECL_ALIGN (decl) = MIN (DECL_ALIGN (decl), BITS_PER_UNIT);
}
if (DECL_BIT_FIELD (decl)
@ -364,6 +367,8 @@ layout_record (rec)
int type_align = TYPE_ALIGN (TREE_TYPE (field));
if (maximum_field_alignment != 0)
type_align = MIN (type_align, maximum_field_alignment);
else if (flag_pack_struct)
type_align = MIN (type_align, BITS_PER_UNIT);
record_align = MAX (record_align, type_align);
}
@ -406,6 +411,7 @@ layout_record (rec)
&& !DECL_PACKED (field)
/* If #pragma pack is in effect, turn off this feature. */
&& maximum_field_alignment == 0
&& !flag_pack_struct
&& !integer_zerop (DECL_SIZE (field)))
{
int type_align = TYPE_ALIGN (TREE_TYPE (field));
@ -440,6 +446,8 @@ layout_record (rec)
if (maximum_field_alignment != 0)
type_align = MIN (type_align, maximum_field_alignment);
else if (flag_pack_struct)
type_align = MIN (type_align, BITS_PER_UNIT);
/* A bit field may not span the unit of alignment of its type.
Advance to next boundary if necessary. */

4
gcc/toplev.c
View File

@ -513,6 +513,9 @@ int flag_gnu_linker = 0;
int flag_gnu_linker = 1;
#endif
/* Tag all structures with __attribute__(packed) */
int flag_pack_struct = 0;
/* Table of language-independent -f options.
STRING is the option name. VARIABLE is the address of the variable.
ON_VALUE is the value to store in VARIABLE
@ -558,6 +561,7 @@ struct { char *string; int *variable; int on_value;} f_options[] =
{"inhibit-size-directive", &flag_inhibit_size_directive, 1},
{"verbose-asm", &flag_verbose_asm, 1},
{"gnu-linker", &flag_gnu_linker, 1},
{"pack-struct", &flag_pack_struct, 1},
{"bytecode", &output_bytecode, 1}
};