[Nasm-bugs] [Bug 3392367] New: Mach-O Executables do not dead strip.
no-reply at bugzilla-nasm.gorcunov.org
no-reply at bugzilla-nasm.gorcunov.org
Fri Oct 21 16:43:01 PDT 2016
https://bugzilla.nasm.us/show_bug.cgi?id=3392367
Bug ID: 3392367
Summary: Mach-O Executables do not dead strip.
Product: NASM
Version: 2.12.xx
Hardware: All
OS: Mac OS
Status: OPEN
Severity: normal
Priority: Medium
Component: Assembler
Assignee: nobody at nasm.us
Reporter: afish at apple.com
CC: gorcunov at gmail.com, hpa at zytor.com, nasm-bugs at nasm.us
In macOS assembler the compiler directive .subsections_via_symbols is used on
files that support dead stripping. This tells the linker to use the symbol
naming rules to strip code that was not called. This directive is defined here:
https://developer.apple.com/library/content/documentation/DeveloperTools/Reference/Assembler/040-Assembler_Directives/asm_directives.html#//apple_ref/doc/uid/TP30000823-TPXREF101
The .subsections_via_symbols directive sets a flag in the Mach-O header flags
field and this is what informs the linker of the dead stripping rules for that
object.
#define MH_SUBSECTIONS_VIA_SYMBOLS 0x2000/* safe to divide up the sections into
sub-sections via symbols for dead
code stripping */
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