Fix missing section

This adds the `S_ATTR_NO_DEAD_STRIP` section attribute, which forces
"unused" code to remain in the binary. This is paired with `S_REGULAR`
to provide a required section type.

This fixes #1.

This may be caused by rust-lang/rust#87570.

Author: nvzqz

CHANGELOG.md

@@ -7,6 +7,14 @@ The format is based on [Keep a Changelog] and this project adheres to
 
 ## [Unreleased]
 
+### Fixed
+
+- Property section was not being emitted due to a change in how `#[used]` works.
+  This seems to be caused by [rust#87570], which switches `#[used]` from
+  `llvm.used` to `llvm.compiler.used`.
+
+[rust#87570]: https://github.com/rust-lang/rust/pull/87570
+
 ## [1.2.0] - 2020-08-30
 
 ### Added

src/lib.rs

@@ -434,7 +434,7 @@ macro_rules! embed_info_plist_bytes {
             // Prevents this from being optimized out of the binary.
             #[used]
             // Places this data in the correct location.
-            #[link_section = "__TEXT,__info_plist"]
+            #[link_section = "__TEXT,__info_plist,regular,no_dead_strip"]
             // Prevents repeated use by creating a linker error.
             #[no_mangle]
             static _EMBED_INFO_PLIST: [u8; LEN] = *REF;
@@ -564,7 +564,7 @@ macro_rules! embed_launchd_plist_bytes {
             // Prevents this from being optimized out of the binary.
             #[used]
             // Places this data in the correct location.
-            #[link_section = "__TEXT,__launchd_plist"]
+            #[link_section = "__TEXT,__launchd_plist,regular,no_dead_strip"]
             // Prevents repeated use by creating a linker error.
             #[no_mangle]
             static _EMBED_LAUNCHD_PLIST: [u8; LEN] = *REF;