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| author | Douglas B Rupp <rupp@gnat.com> | 2003-01-09 05:23:55 +0000 |
|---|---|---|
| committer | Douglas Rupp <rupp@gcc.gnu.org> | 2003-01-09 05:23:55 +0000 |
| commit | fe77449a165426dfd6793158bc15204736ddd783 (patch) | |
| tree | b72f87fe5a93707fed09664a945fd2d2b191832f /gcc/doc | |
| parent | 984179689f29e1a1d257e1aa63bdaca9c0ec89b2 (diff) | |
| download | gcc-fe77449a165426dfd6793158bc15204736ddd783.zip gcc-fe77449a165426dfd6793158bc15204736ddd783.tar.gz gcc-fe77449a165426dfd6793158bc15204736ddd783.tar.bz2 | |
i386.c (ix86_attribute_table): Add new attributes ms_struct and gcc_struct.
* config/i386/i386.c (ix86_attribute_table): Add new attributes
ms_struct and gcc_struct.
(ix86_handle_struct_attribute): New function.
(ix86_ms_bitfield_layout_p): Update to take new attributes
into account.
* doc/extend.texi: Document new attributes.
* testsuite/gcc.dg/bf-ms-attrib.c: New test.
From-SVN: r61072
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/extend.texi | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index cb7a0a3..26817b0 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -3212,6 +3212,26 @@ Medium and large model objects may live anywhere in the 32-bit address space (the compiler will generate @code{seth/add3} instructions to load their addresses). +@subsection i386 Variable Attributes + +Two attributes are currently defined for i386 configurations: +@code{ms_struct} and @code{gcc_struct} + +@item ms_struct +@itemx gcc_struct +@cindex @code{ms_struct} +@cindex @code{gcc_struct} + +If @code{packed} is used on a structure, or if bit-fields are used +it may be that the Microsoft ABI packs them differently +than GCC would normally pack them. Particularly when moving packed +data between functions compiled with GCC and the native Microsoft compiler +(either via function call or as data in a file), it may be necessary to access +either format. + +Currently @option{-m[no-]ms-bitfields} is provided for the Windows X86 +compilers to match the native Microsoft compiler. + @end table To specify multiple attributes, separate them by commas within the @@ -3471,6 +3491,26 @@ If you replaced @code{short_a} with @code{short} in the variable declaration, the above program would abort when compiled with @option{-fstrict-aliasing}, which is on by default at @option{-O2} or above in recent GCC versions. + +@subsection i386 Type Attributes + +Two attributes are currently defined for i386 configurations: +@code{ms_struct} and @code{gcc_struct} + +@item ms_struct +@itemx gcc_struct +@cindex @code{ms_struct} +@cindex @code{gcc_struct} + +If @code{packed} is used on a structure, or if bit-fields are used +it may be that the Microsoft ABI packs them differently +than GCC would normally pack them. Particularly when moving packed +data between functions compiled with GCC and the native Microsoft compiler +(either via function call or as data in a file), it may be necessary to access +either format. + +Currently @option{-m[no-]ms-bitfields} is provided for the Windows X86 +compilers to match the native Microsoft compiler. @end table To specify multiple attributes, separate them by commas within the |