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Document new Mach-O flags

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Add documentation for recent Mach-O enhancements.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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H. Peter Anvin 2017-03-28 15:34:30 -07:00
parent 495b6352d8
commit 002532d323
1 changed files with 27 additions and 7 deletions
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doc/nasmdoc.src
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@ -5763,6 +5763,14 @@ comma. The following flags can also be specified:
\b \c{bss} - this section is uninitialized and filled with zero
\b \c{zerofill} - same as \c{bss}
\b \c{no_dead_strip} - inhibit dead code stripping for this section
\b \c{live_support} - set the live support flag for this section
\b \c{strip_static_syms} - strip static symbols for this section
\b \c{align=}\e{alignment} - specify section alignment
The default is \c{data}, unless the section name is \c{__text} or
@ -5800,14 +5808,26 @@ The directive \c{subsections_via_symbols} sets the
the linker that the symbols in the file matches the conventions
required to allow for link-time dead code elimination.
This directive takes no arguments. Like most directives, it is
wrapped in a macro; it is therefore possible to support older versions
of NASM (without the dead code elimination support) simply by:
This directive takes no arguments.
This is a macro implemented as a \c{%pragma}. It can also be
specified in its \c{%pragma} form, in which case it will not affect
non-Mach-O builds of the same source code:
\c %pragma macho subsections_via_symbols
\S{macho-ssvs} \c{macho} specfic directive \i\c{no_dead_strip}
The directive \c{no_dead_strip} sets the Mach-O \c{SH_NO_DEAD_STRIP}
section flag on the section containing a a specific symbol. This
directive takes a list of symbols as its arguments.
This is a macro implemented as a \c{%pragma}. It can also be
specified in its \c{%pragma} form, in which case it will not affect
non-Mach-O builds of the same source code:
\c %pragma macho no_dead_strip symbol...
\c %ifnmacro subsections_via_symbols
\c %imacro subsections_via_symbols 0
\c %endmacro
\c %endif
\H{elffmt} \i\c{elf32}, \i\c{elf64}, \i\c{elfx32}: \I{ELF}\I{linux, elf}\i{Executable and Linkable
Format} Object Files