Remove libbacktrace implementation

.github/workflows/main.yml

@@ -52,39 +52,24 @@ jobs:
       shell: bash
       if: matrix.rust == 'stable-i686-msvc'
 
-    # Force packed debuginfo on macOS because libbacktrace only works with
-    # packed debuginfo. We specifically test later that both packed and
-    # unpacked work.
-    - run: |
-        echo CARGO_PROFILE_DEV_SPLIT_DEBUGINFO=packed >> $GITHUB_ENV
-        echo CARGO_PROFILE_TEST_SPLIT_DEBUGINFO=packed >> $GITHUB_ENV
-      if: matrix.os == 'macos-latest'
-
-    - run: cargo build --manifest-path crates/backtrace-sys/Cargo.toml
     - run: cargo build
     - run: cargo test
-    - run: cargo test --features "gimli-symbolize"
-    # run: cargo test --features "libbacktrace"
-    - run: cargo check --features "libbacktrace gimli-symbolize"
     - run: cargo test --features "serialize-rustc"
     - run: cargo test --features "serialize-serde"
     - run: cargo test --features "verify-winapi"
     - run: cargo test --features "cpp_demangle"
     - run: cargo test --no-default-features
-    - run: cargo test --no-default-features --features "libbacktrace"
-    - run: cargo test --no-default-features --features "gimli-symbolize"
-    - run: cargo test --no-default-features --features "gimli-symbolize libbacktrace"
-    - run: cargo test --no-default-features --features "libbacktrace std"
-    - run: cargo test --no-default-features --features "gimli-symbolize std"
     - run: cargo test --no-default-features --features "std"
     - run: cargo test --manifest-path crates/cpp_smoke_test/Cargo.toml
+    # This test is specifically about packed debuginfo with `*.dSYM` files
     - run: cargo test --manifest-path crates/macos_frames_test/Cargo.toml
-    - run: cargo test --features libbacktrace --manifest-path crates/without_debuginfo/Cargo.toml
+      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 libbacktrace
     - run: cargo test --manifest-path crates/line-tables-only/Cargo.toml --features gimli-symbolize
 
-    # Test that if debuginfo is compressed gimli still works
+    # Test debuginfo compression still works
     - run: cargo test
       if: contains(matrix.os, 'ubuntu')
       env:

Cargo.toml

@@ -22,7 +22,6 @@ exclude = ['crates/without_debuginfo', 'crates/macos_frames_test', 'crates/line-
 [dependencies]
 cfg-if = "1.0"
 rustc-demangle = "0.1.4"
-backtrace-sys = { path = "crates/backtrace-sys", version = "0.1.35", optional = true, default_features = false }
 libc = { version = "0.2.94", default-features = false }
 
 # Optionally enable the ability to serialize a `Backtrace`, controlled through
@@ -36,11 +35,10 @@ cpp_demangle = { default-features = false, version = "0.3.0", optional = true }
 
 # Optional dependencies enabled through the `gimli-symbolize` feature, do not
 # use these features directly.
-addr2line = { version = "0.15.1", optional = true, default-features = false }
-miniz_oxide = { version = "0.4.0", optional = true, default-features = false }
+addr2line = { version = "0.15.1", default-features = false }
+miniz_oxide = { version = "0.4.0", default-features = false }
 [dependencies.object]
 version = "0.24"
-optional = true
 default-features = false
 features = ['read_core', 'elf', 'macho', 'pe', 'unaligned', 'archive']
 
@@ -58,26 +56,11 @@ libloading = "0.6"
 
 [features]
 # By default libstd support and gimli-symbolize is used to symbolize addresses.
-default = ["std", "gimli-symbolize"]
+default = ["std"]
 
 # Include std support. This enables types like `Backtrace`.
 std = []
 
-#=======================================
-# Methods of resolving symbols
-#
-# - gimli-symbolize: use the `gimli-rs/addr2line` crate to symbolicate
-#   addresses into file, line, and name using DWARF debug information.
-# - libbacktrace: this feature activates the `backtrace-sys` dependency,
-#   building the libbacktrace library found in gcc repos.
-#
-# Note that MSVC unconditionally uses the dbghelp library to symbolize and won't
-# be affected by feature selection here. Also note that it's highly unlikely you
-# want to configure this. If you're having trouble getting backtraces it's
-# likely best to open an issue.
-gimli-symbolize = ["addr2line", "miniz_oxide", "object"]
-libbacktrace = ["backtrace-sys/backtrace-sys"]
-
 #=======================================
 # Methods of serialization
 #
@@ -91,11 +74,13 @@ serialize-serde = ["serde"]
 # Only here for backwards compatibility purposes or for internal testing
 # purposes. New code should use none of these features.
 coresymbolication = []
+dbghelp = []
 dladdr = []
+gimli-symbolize = []
 kernel32 = []
-unix-backtrace = []
+libbacktrace = []
 libunwind = []
-dbghelp = []
+unix-backtrace = []
 verify-winapi = [
   'winapi/dbghelp',
   'winapi/handleapi',
@@ -132,7 +117,7 @@ edition = '2018'
 
 [[test]]
 name = "accuracy"
-required-features = ["std", "gimli-symbolize"]
+required-features = ["std"]
 edition = '2018'
 
 [[test]]