[gcc r14-7808] gccrs: proc macro: Add crate type regression tests

[Arthur Cohen <cohenarthur@gcc.gnu.org>]

https://gcc.gnu.org/g:ad4c18174bb3dab443435fe19ca593206f98cddf

commit r14-7808-gad4c18174bb3dab443435fe19ca593206f98cddf
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Tue Jul 18 15:43:06 2023 +0200

    gccrs: proc macro: Add crate type regression tests
    
    Add several tests to prevent regression with proc_macro,
    proc_macro_derive and proc_macro_attribute attributes error messages.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/proc_macro_attribute_crate_type.rs: New test.
            * rust/compile/proc_macro_crate_type.rs: New test.
            * rust/compile/proc_macro_derive_crate_type.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 gcc/testsuite/rust/compile/proc_macro_attribute_crate_type.rs | 4 ++++
 gcc/testsuite/rust/compile/proc_macro_crate_type.rs           | 4 ++++
 gcc/testsuite/rust/compile/proc_macro_derive_crate_type.rs    | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/gcc/testsuite/rust/compile/proc_macro_attribute_crate_type.rs b/gcc/testsuite/rust/compile/proc_macro_attribute_crate_type.rs
new file mode 100644
index 00000000000..9ffd2b079b4
--- /dev/null
+++ b/gcc/testsuite/rust/compile/proc_macro_attribute_crate_type.rs
@@ -0,0 +1,4 @@
+// { dg-additional-options "-frust-crate-type=lib" }
+
+#[proc_macro_attribute] // { dg-excess-errors "the '#\[proc_macro_attribute\]' attribute is only usable with crates of the 'proc-macro' crate type" }
+pub fn my_invalid_macro() {}
diff --git a/gcc/testsuite/rust/compile/proc_macro_crate_type.rs b/gcc/testsuite/rust/compile/proc_macro_crate_type.rs
new file mode 100644
index 00000000000..f27a94a6d33
--- /dev/null
+++ b/gcc/testsuite/rust/compile/proc_macro_crate_type.rs
@@ -0,0 +1,4 @@
+// { dg-additional-options "-frust-crate-type=lib" }
+
+#[proc_macro] // { dg-excess-errors "the '#\[proc_macro\]' attribute is only usable with crates of the 'proc-macro' crate type" }
+pub fn my_invalid_macro() {}
diff --git a/gcc/testsuite/rust/compile/proc_macro_derive_crate_type.rs b/gcc/testsuite/rust/compile/proc_macro_derive_crate_type.rs
new file mode 100644
index 00000000000..20f69970dc4
--- /dev/null
+++ b/gcc/testsuite/rust/compile/proc_macro_derive_crate_type.rs
@@ -0,0 +1,6 @@
+// { dg-additional-options "-frust-crate-type=lib" }
+
+trait Dungeness {}
+
+#[proc_macro_derive(Dungeness)] // { dg-excess-errors "the '#\[proc_macro_derive\]' attribute is only usable with crates of the 'proc-macro' crate type" }
+pub fn my_invalid_macro() {}