Add new --bypass-ignore-backends option

src/bootstrap/src/core/build_steps/test.rs

@@ -1965,6 +1965,9 @@ Please disable assertions with `rust.debug-assertions = false`.
             cmd.arg("--default-codegen-backend")
                 .arg(builder.config.default_codegen_backend(test_compiler.host).name());
         }
+        if builder.config.cmd.bypass_ignore_backends() {
+            cmd.arg("--bypass-ignore-backends");
+        }
 
         if builder.build.config.llvm_enzyme {
             cmd.arg("--has-enzyme");

src/bootstrap/src/core/config/flags.rs

@@ -422,6 +422,9 @@ pub enum Subcommand {
         #[arg(long)]
         /// Use a different codegen backend when running tests.
         test_codegen_backend: Option<CodegenBackendKind>,
+        #[arg(long)]
+        /// Ignore `//@ ignore-backends` directives.
+        bypass_ignore_backends: bool,
     },
     /// Build and run some test suites *in Miri*
     Miri {
@@ -668,6 +671,13 @@ impl Subcommand {
             _ => None,
         }
     }
+
+    pub fn bypass_ignore_backends(&self) -> bool {
+        match self {
+            Subcommand::Test { bypass_ignore_backends, .. } => *bypass_ignore_backends,
+            _ => false,
+        }
+    }
 }
 
 /// Returns the shell completion for a given shell, if the result differs from the current

src/doc/rustc-dev-guide/src/tests/directives.md

@@ -207,7 +207,9 @@ settings:
   on `wasm32-unknown-unknown` target because the target does not support the
   `proc-macro` crate type.
 - `needs-target-std` — ignores if target platform does not have std support.
-- `ignore-backends` — ignores the listed backends, separated by whitespace characters.
+- `ignore-backends` — ignores the listed backends, separated by whitespace characters. Please note
+  that this directive can be overriden with the `--bypass-ignore-backends=[BACKEND]` command line
+  flag. 
 - `needs-backends` — only runs the test if current codegen backend is listed.
 
 The following directives will check LLVM support:

src/etc/completions/x.fish

@@ -336,6 +336,7 @@ complete -c x -n "__fish_x_using_subcommand test" -l force-rerun -d 'rerun tests
 complete -c x -n "__fish_x_using_subcommand test" -l only-modified -d 'only run tests that result has been changed'
 complete -c x -n "__fish_x_using_subcommand test" -l rustfix-coverage -d 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`'
 complete -c x -n "__fish_x_using_subcommand test" -l no-capture -d 'don\'t capture stdout/stderr of tests'
+complete -c x -n "__fish_x_using_subcommand test" -l bypass-ignore-backends -d 'Ignore `//@ ignore-backends` directives'
 complete -c x -n "__fish_x_using_subcommand test" -s v -l verbose -d 'use verbose output (-vv for very verbose)'
 complete -c x -n "__fish_x_using_subcommand test" -s i -l incremental -d 'use incremental compilation'
 complete -c x -n "__fish_x_using_subcommand test" -l include-default-paths -d 'include default paths in addition to the provided ones'

src/etc/completions/x.ps1

@@ -383,6 +383,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--only-modified', '--only-modified', [CompletionResultType]::ParameterName, 'only run tests that result has been changed')
             [CompletionResult]::new('--rustfix-coverage', '--rustfix-coverage', [CompletionResultType]::ParameterName, 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`')
             [CompletionResult]::new('--no-capture', '--no-capture', [CompletionResultType]::ParameterName, 'don''t capture stdout/stderr of tests')
+            [CompletionResult]::new('--bypass-ignore-backends', '--bypass-ignore-backends', [CompletionResultType]::ParameterName, 'Ignore `//@ ignore-backends` directives')
             [CompletionResult]::new('-v', '-v', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('--verbose', '--verbose', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('-i', '-i', [CompletionResultType]::ParameterName, 'use incremental compilation')

src/etc/completions/x.py.fish

@@ -336,6 +336,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand test" -l force-rerun -d 'rerun
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l only-modified -d 'only run tests that result has been changed'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l rustfix-coverage -d 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l no-capture -d 'don\'t capture stdout/stderr of tests'
+complete -c x.py -n "__fish_x.py_using_subcommand test" -l bypass-ignore-backends -d 'Ignore `//@ ignore-backends` directives'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -s v -l verbose -d 'use verbose output (-vv for very verbose)'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -s i -l incremental -d 'use incremental compilation'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l include-default-paths -d 'include default paths in addition to the provided ones'

src/etc/completions/x.py.ps1

@@ -383,6 +383,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--only-modified', '--only-modified', [CompletionResultType]::ParameterName, 'only run tests that result has been changed')
             [CompletionResult]::new('--rustfix-coverage', '--rustfix-coverage', [CompletionResultType]::ParameterName, 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`')
             [CompletionResult]::new('--no-capture', '--no-capture', [CompletionResultType]::ParameterName, 'don''t capture stdout/stderr of tests')
+            [CompletionResult]::new('--bypass-ignore-backends', '--bypass-ignore-backends', [CompletionResultType]::ParameterName, 'Ignore `//@ ignore-backends` directives')
             [CompletionResult]::new('-v', '-v', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('--verbose', '--verbose', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('-i', '-i', [CompletionResultType]::ParameterName, 'use incremental compilation')

src/etc/completions/x.py.sh

@@ -3875,7 +3875,7 @@ _x.py() {
             return 0
             ;;
         x.py__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --test-codegen-backend --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --compile-time-deps --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --test-codegen-backend --bypass-ignore-backends --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --compile-time-deps --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0

src/etc/completions/x.py.zsh

@@ -383,6 +383,7 @@ _arguments "${_arguments_options[@]}" : \
 '--only-modified[only run tests that result has been changed]' \
 '--rustfix-coverage[enable this to generate a Rustfix coverage file, which is saved in \`/<build_base>/rustfix_missing_coverage.txt\`]' \
 '--no-capture[don'\''t capture stdout/stderr of tests]' \
+'--bypass-ignore-backends[Ignore \`//@ ignore-backends\` directives]' \
 '*-v[use verbose output (-vv for very verbose)]' \
 '*--verbose[use verbose output (-vv for very verbose)]' \
 '-i[use incremental compilation]' \

src/etc/completions/x.sh

@@ -3875,7 +3875,7 @@ _x() {
             return 0
             ;;
         x__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --test-codegen-backend --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --compile-time-deps --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --test-codegen-backend --bypass-ignore-backends --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --json-output --compile-time-deps --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --ci --skip-std-check-if-no-download-rustc --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0

src/etc/completions/x.zsh

@@ -383,6 +383,7 @@ _arguments "${_arguments_options[@]}" : \
 '--only-modified[only run tests that result has been changed]' \
 '--rustfix-coverage[enable this to generate a Rustfix coverage file, which is saved in \`/<build_base>/rustfix_missing_coverage.txt\`]' \
 '--no-capture[don'\''t capture stdout/stderr of tests]' \
+'--bypass-ignore-backends[Ignore \`//@ ignore-backends\` directives]' \
 '*-v[use verbose output (-vv for very verbose)]' \
 '*--verbose[use verbose output (-vv for very verbose)]' \
 '-i[use incremental compilation]' \

src/tools/compiletest/src/common.rs

@@ -710,6 +710,8 @@ pub struct Config {
     pub default_codegen_backend: CodegenBackend,
     /// Name/path of the backend to use instead of `default_codegen_backend`.
     pub override_codegen_backend: Option<String>,
+    /// Whether to ignore `//@ ignore-backends`.
+    pub bypass_backends: bool,
 }
 
 impl Config {

src/tools/compiletest/src/directives.rs

@@ -1493,7 +1493,7 @@ fn ignore_backends(config: &Config, line: &DirectiveLine<'_>) -> IgnoreDecision
                 }
             }
         }) {
-            if config.default_codegen_backend == backend {
+            if !config.bypass_backends && config.default_codegen_backend == backend {
                 return IgnoreDecision::Ignore {
                     reason: format!("{} backend is marked as ignore", backend.as_str()),
                 };

src/tools/compiletest/src/lib.rs

@@ -217,7 +217,8 @@ fn parse_config(args: Vec<String>) -> Config {
             "override-codegen-backend",
             "the codegen backend to use instead of the default one",
             "CODEGEN BACKEND [NAME | PATH]",
-        );
+        )
+        .optflag("", "bypass-ignore-backends", "ignore `//@ ignore-backends` directives");
 
     let (argv0, args_) = args.split_first().unwrap();
     if args.len() == 1 || args[1] == "-h" || args[1] == "--help" {
@@ -484,6 +485,7 @@ fn parse_config(args: Vec<String>) -> Config {
 
         default_codegen_backend,
         override_codegen_backend,
+        bypass_backends: matches.opt_present("bypass-ignore-backends"),
     }
 }
 

src/tools/compiletest/src/rustdoc_gui_test.rs

@@ -138,5 +138,6 @@ fn incomplete_config_for_rustdoc_gui_test() -> Config {
         minicore_path: Default::default(),
         default_codegen_backend: CodegenBackend::Llvm,
         override_codegen_backend: None,
+        bypass_backends: Default::default(),
     }
 }