compiletest: add no-auto-check-cfg directive

this directive prevents compiletest from adding any implicit and
automatic --check-cfg arguments

Author: Urgau

src/tools/compiletest/src/header.rs

@@ -208,6 +208,8 @@ pub struct TestProps {
     pub llvm_cov_flags: Vec<String>,
     /// Extra flags to pass to LLVM's `filecheck` tool, in tests that use it.
     pub filecheck_flags: Vec<String>,
+    /// Don't automatically insert any `--check-cfg` args
+    pub no_auto_check_cfg: bool,
 }
 
 mod directives {
@@ -249,6 +251,7 @@ mod directives {
     pub const COMPARE_OUTPUT_LINES_BY_SUBSET: &'static str = "compare-output-lines-by-subset";
     pub const LLVM_COV_FLAGS: &'static str = "llvm-cov-flags";
     pub const FILECHECK_FLAGS: &'static str = "filecheck-flags";
+    pub const NO_AUTO_CHECK_CFG: &'static str = "no-auto-check-cfg";
     // This isn't a real directive, just one that is probably mistyped often
     pub const INCORRECT_COMPILER_FLAGS: &'static str = "compiler-flags";
 }
@@ -304,6 +307,7 @@ impl TestProps {
             remap_src_base: false,
             llvm_cov_flags: vec![],
             filecheck_flags: vec![],
+            no_auto_check_cfg: false,
         }
     }
 
@@ -567,6 +571,8 @@ impl TestProps {
                     if let Some(flags) = config.parse_name_value_directive(ln, FILECHECK_FLAGS) {
                         self.filecheck_flags.extend(split_flags(&flags));
                     }
+
+                    config.set_name_directive(ln, NO_AUTO_CHECK_CFG, &mut self.no_auto_check_cfg);
                 },
             );
 
@@ -860,6 +866,7 @@ const KNOWN_DIRECTIVE_NAMES: &[&str] = &[
     "needs-unwind",
     "needs-wasmtime",
     "needs-xray",
+    "no-auto-check-cfg",
     "no-prefer-dynamic",
     "normalize-stderr-32bit",
     "normalize-stderr-64bit",

tests/ui/check-cfg/allow-at-crate-level.rs

@@ -1,6 +1,7 @@
 // This test check that #![allow(unexpected_cfgs)] works with --cfg
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ compile-flags: --cfg=unexpected --check-cfg=cfg()
 
 #![allow(unexpected_cfgs)]

tests/ui/check-cfg/allow-macro-cfg.rs

@@ -1,6 +1,7 @@
 // This test check that local #[allow(unexpected_cfgs)] works
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ compile-flags: --check-cfg=cfg()
 
 #[allow(unexpected_cfgs)]

tests/ui/check-cfg/allow-same-level.rs

@@ -1,6 +1,7 @@
 // This test check that #[allow(unexpected_cfgs)] doesn't work if put on the same level
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ compile-flags: --check-cfg=cfg()
 
 #[allow(unexpected_cfgs)]

tests/ui/check-cfg/allow-same-level.stderr

@@ -1,5 +1,5 @@
 warning: unexpected `cfg` condition name: `FALSE`
-  --> $DIR/allow-same-level.rs:7:7
+  --> $DIR/allow-same-level.rs:8:7
    |
 LL | #[cfg(FALSE)]
    |       ^^^^^

tests/ui/check-cfg/allow-top-level.rs

@@ -1,6 +1,7 @@
 // This test check that a top-level #![allow(unexpected_cfgs)] works
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ compile-flags: --check-cfg=cfg()
 
 #![allow(unexpected_cfgs)]

tests/ui/check-cfg/allow-upper-level.rs

@@ -1,6 +1,7 @@
 // This test check that #[allow(unexpected_cfgs)] work if put on an upper level
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ compile-flags: --check-cfg=cfg()
 
 #[allow(unexpected_cfgs)]

tests/ui/check-cfg/cargo-feature.none.stderr

@@ -1,5 +1,5 @@
 warning: unexpected `cfg` condition value: `serde`
-  --> $DIR/cargo-feature.rs:13:7
+  --> $DIR/cargo-feature.rs:14:7
    |
 LL | #[cfg(feature = "serde")]
    |       ^^^^^^^^^^^^^^^^^ help: remove the condition
@@ -10,7 +10,7 @@ LL | #[cfg(feature = "serde")]
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: (none)
-  --> $DIR/cargo-feature.rs:17:7
+  --> $DIR/cargo-feature.rs:18:7
    |
 LL | #[cfg(feature)]
    |       ^^^^^^^ help: remove the condition
@@ -20,7 +20,7 @@ LL | #[cfg(feature)]
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `tokio_unstable`
-  --> $DIR/cargo-feature.rs:21:7
+  --> $DIR/cargo-feature.rs:22:7
    |
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
@@ -30,7 +30,7 @@ LL | #[cfg(tokio_unstable)]
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `CONFIG_NVME`
-  --> $DIR/cargo-feature.rs:25:7
+  --> $DIR/cargo-feature.rs:26:7
    |
 LL | #[cfg(CONFIG_NVME = "m")]
    |       ^^^^^^^^^^^^^^^^^

tests/ui/check-cfg/cargo-feature.rs

@@ -3,6 +3,7 @@
 // list of all the expected names
 //
 //@ check-pass
+//@ no-auto-check-cfg
 //@ revisions: some none
 //@ rustc-env:CARGO_CRATE_NAME=foo
 //@ [none]compile-flags: --check-cfg=cfg(feature,values())

tests/ui/check-cfg/cargo-feature.some.stderr

@@ -1,5 +1,5 @@
 warning: unexpected `cfg` condition value: `serde`
-  --> $DIR/cargo-feature.rs:13:7
+  --> $DIR/cargo-feature.rs:14:7
    |
 LL | #[cfg(feature = "serde")]
    |       ^^^^^^^^^^^^^^^^^
@@ -10,7 +10,7 @@ LL | #[cfg(feature = "serde")]
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: (none)
-  --> $DIR/cargo-feature.rs:17:7
+  --> $DIR/cargo-feature.rs:18:7
    |
 LL | #[cfg(feature)]
    |       ^^^^^^^- help: specify a config value: `= "bitcode"`
@@ -20,7 +20,7 @@ LL | #[cfg(feature)]
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `tokio_unstable`
-  --> $DIR/cargo-feature.rs:21:7
+  --> $DIR/cargo-feature.rs:22:7
    |
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
@@ -30,7 +30,7 @@ LL | #[cfg(tokio_unstable)]
    = note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `m`
-  --> $DIR/cargo-feature.rs:25:7
+  --> $DIR/cargo-feature.rs:26:7
    |
 LL | #[cfg(CONFIG_NVME = "m")]
    |       ^^^^^^^^^^^^^^---