Remove unused libbacktrace and gimli-symbolize features (#615)

.github/workflows/main.yml

@@ -73,8 +73,8 @@ jobs:
       env:
         CARGO_PROFILE_DEV_SPLIT_DEBUGINFO: packed
         CARGO_PROFILE_TEST_SPLIT_DEBUGINFO: packed
-    - run: cargo test --features gimli-symbolize --manifest-path crates/without_debuginfo/Cargo.toml
-    - run: cargo test --manifest-path crates/line-tables-only/Cargo.toml --features gimli-symbolize
+    - run: cargo test --manifest-path crates/without_debuginfo/Cargo.toml
+    - run: cargo test --manifest-path crates/line-tables-only/Cargo.toml
 
     # Test debuginfo compression still works
     - run: cargo test

Cargo.toml

@@ -79,9 +79,7 @@ coresymbolication = []
 dbghelp = []
 dl_iterate_phdr = []
 dladdr = []
-gimli-symbolize = []
 kernel32 = []
-libbacktrace = []
 libunwind = []
 unix-backtrace = []
 verify-winapi = [

crates/line-tables-only/Cargo.toml

@@ -15,7 +15,3 @@ features = [
   'libunwind',
   'std',
 ]
-
-[features]
-libbacktrace = ['backtrace/libbacktrace']
-gimli-symbolize = ['backtrace/gimli-symbolize']

crates/without_debuginfo/Cargo.toml

@@ -14,7 +14,3 @@ debug = false
 
 [profile.test]
 debug = false
-
-[features]
-libbacktrace = ['backtrace/libbacktrace']
-gimli-symbolize = ['backtrace/gimli-symbolize']

src/symbolize/mod.rs

@@ -453,7 +453,7 @@ cfg_if::cfg_if! {
 /// While this function is always available it doesn't actually do anything on
 /// most implementations. Libraries like dbghelp or libbacktrace do not provide
 /// facilities to deallocate state and manage the allocated memory. For now the
-/// `gimli-symbolize` feature of this crate is the only feature where this
+/// `std` feature of this crate is the only feature where this
 /// function has any effect.
 #[cfg(feature = "std")]
 pub fn clear_symbol_cache() {