[gcc r14-8133] gccrs: Add named variadic argument test

[Arthur Cohen]

https://gcc.gnu.org/g:0df14bb1f3d944ea7281979d03c812a8d2c09ce7

commit r14-8133-g0df14bb1f3d944ea7281979d03c812a8d2c09ce7
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Mon Nov 6 11:37:50 2023 +0100

    gccrs: Add named variadic argument test
    
    Variadic arguments may have a name or a pattern. This commit provides two
    new tests in order to ensure their correct behavior.
    
    gcc/testsuite/ChangeLog:
    
            * rust/compile/pattern_variadic.rs: New test.
            * rust/execute/torture/named_variadic.rs: New test.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 gcc/testsuite/rust/compile/pattern_variadic.rs       | 14 ++++++++++++++
 gcc/testsuite/rust/execute/torture/named_variadic.rs | 20 ++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/gcc/testsuite/rust/compile/pattern_variadic.rs b/gcc/testsuite/rust/compile/pattern_variadic.rs
new file mode 100644
index 00000000000..2932b70f5b4
--- /dev/null
+++ b/gcc/testsuite/rust/compile/pattern_variadic.rs
@@ -0,0 +1,14 @@
+extern "C" {
+    fn printf(fmt: *const i8, _: ...);
+}
+
+fn main() -> i32 {
+    unsafe {
+        printf(
+            "%s" as *const str as *const i8,
+            "Message" as *const str as *const i8,
+        );
+    }
+
+    0
+}
diff --git a/gcc/testsuite/rust/execute/torture/named_variadic.rs b/gcc/testsuite/rust/execute/torture/named_variadic.rs
new file mode 100644
index 00000000000..d9b59cff41c
--- /dev/null
+++ b/gcc/testsuite/rust/execute/torture/named_variadic.rs
@@ -0,0 +1,20 @@
+// { dg-output "Named variadic" }
+
+extern "C" {
+    fn printf(fmt: *const i8, variadic: ...);
+}
+
+fn print(s: &str) {
+    unsafe {
+        printf(
+            "%s" as *const str as *const i8,
+            s as *const str as *const i8,
+        );
+    }
+}
+
+fn main() -> i32 {
+    print("Named variadic");
+
+    0
+}