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.

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:/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;