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Fix the dbg! macro for no_std mode.

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Check for the `std` feature outside the macro body rather than inside,
so that we get the `std` feature in `cretonne-codegen`, rather than in
whatever crate the macro is being expanded in.
This commit is contained in:
Dan Gohman
2018-04-19 13:18:21 -07:00
parent d72706c478
commit 73c19bbf6d
1 changed files with 8 additions and 0 deletions
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8
lib/codegen/src/dbg.rs
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@@ -110,6 +110,7 @@ fn open_file() -> io::BufWriter<File> {
/// Write a line to the debug trace file if tracing is enabled. /// Write a line to the debug trace file if tracing is enabled.
/// ///
/// Arguments are the same as for `printf!`. /// Arguments are the same as for `printf!`.
#[cfg(feature = "std")]
#[macro_export] #[macro_export]
macro_rules! dbg { macro_rules! dbg {
($($arg:tt)+) => { ($($arg:tt)+) => {
@@ -121,6 +122,13 @@ macro_rules! dbg {
} }
} }
/// `dbg!` isn't supported in `no_std` mode, so expand it into nothing.
#[cfg(not(feature = "std"))]
#[macro_export]
macro_rules! dbg {
($($arg:tt)+) => {}
}
/// Helper for printing lists. /// Helper for printing lists.
pub struct DisplayList<'a, T>(pub &'a [T]) pub struct DisplayList<'a, T>(pub &'a [T])
where where