[stdlib] Don't make the stack executable

tinysun212 · tinysun212 · commit 1dfe3078f780 · 2016-06-18T05:17:32.000+09:00
If some object file doesn't contain a section of the name '.note.GNU-stack', the linker make the stack executable. We append the section to swift_begin.o and swift_end.o because don't need executable stack. (reference: http://en.chys.info/2010/12/note-gnu-stack/)
diff --git a/stdlib/public/runtime/swift_sections.S b/stdlib/public/runtime/swift_sections.S
@@ -76,3 +76,4 @@ define_simple_section swift3_assocty
 
 define_sized_section swift2_protocol_conformances
 define_sized_section swift2_type_metadata
+.section	.note.GNU-stack,"",@progbits

Original file line number	Diff line number	Diff line change
`@@ -76,3 +76,4 @@ define_simple_section swift3_assocty`
`76`	`76`
`77`	`77`	`define_sized_section swift2_protocol_conformances`
`78`	`78`	`define_sized_section swift2_type_metadata`
	`79`	`+.section .note.GNU-stack,"",@progbits`