The very first thing in a rust source file might be the optional UTF-8
BOM. This is the 3 bytes 0xEF 0xBB 0xBF. They can simply be skipped,
they just mark the file as UTF-8. Add some testcases to show we now
handle such files.
---
gcc/rust/lex/rust-lex.cc | 13 +++++++++++++
gcc/testsuite/rust/compile/torture/bom.rs | 1 +
gcc/testsuite/rust/compile/torture/bom_comment.rs | 2 ++
gcc/testsuite/rust/compile/torture/bom_shebang.rs | 2 ++
.../rust/compile/torture/bom_whitespace.rs | 2 ++
5 files changed, 20 insertions(+)
create mode 100644 gcc/testsuite/rust/compile/torture/bom.rs
create mode 100644 gcc/testsuite/rust/compile/torture/bom_comment.rs
create mode 100644 gcc/testsuite/rust/compile/torture/bom_shebang.rs
create mode 100644 gcc/testsuite/rust/compile/torture/bom_whitespace.rs
diff --git a/gcc/rust/lex/rust-lex.cc b/gcc/rust/lex/rust-lex.cc
index ebd69de0fd1..617dd69a080 100644
--- a/gcc/rust/lex/rust-lex.cc
+++ b/gcc/rust/lex/rust-lex.cc
@@ -237,6 +237,19 @@ Lexer::build_token ()
current_char = peek_input ();
skip_input ();
+ // detect UTF8 bom
+ //
+ // Must be the first thing on the first line.
+ // There might be an optional BOM (Byte Order Mark), which for UTF-8 is
+ // the three bytes 0xEF, 0xBB and 0xBF. These can simply be skipped.
+ if (current_line == 1 && current_column == 1 && current_char == 0xef
+ && peek_input () == 0xbb && peek_input (1) == 0xbf)
+ {
+ skip_input (1);
+ current_char = peek_input ();
+ skip_input ();
+ }
+
// detect shebang
// Must be the first thing on the first line, starting with #!
// But since an attribute can also start with an #! we don't count it as
a
diff --git a/gcc/testsuite/rust/compile/torture/bom.rs
b/gcc/testsuite/rust/compile/torture/bom.rs
new file mode 100644
index 00000000000..5edcab227ee
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/bom.rs
@@ -0,0 +1 @@
+pub fn main () { }
diff --git a/gcc/testsuite/rust/compile/torture/bom_comment.rs
b/gcc/testsuite/rust/compile/torture/bom_comment.rs
new file mode 100644
index 00000000000..020e1707b55
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/bom_comment.rs
@@ -0,0 +1,2 @@
+// UTF8 BOM
+pub fn main () { }
diff --git a/gcc/testsuite/rust/compile/torture/bom_shebang.rs
b/gcc/testsuite/rust/compile/torture/bom_shebang.rs
new file mode 100644
index 00000000000..4c552e8d71d
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/bom_shebang.rs
@@ -0,0 +1,2 @@
+#!/usr/bin/cat
+pub fn main () { }
diff --git a/gcc/testsuite/rust/compile/torture/bom_whitespace.rs
b/gcc/testsuite/rust/compile/torture/bom_whitespace.rs
new file mode 100644
index 00000000000..b10d5654473
--- /dev/null
+++ b/gcc/testsuite/rust/compile/torture/bom_whitespace.rs
@@ -0,0 +1,2 @@
+
+pub fn main () { }
--
2.32.0
--
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