Mostly adopted from the existing C musttail plugin tests.
---
gcc/testsuite/c-c++-common/musttail1.c | 17 ++++++++++++
gcc/testsuite/c-c++-common/musttail2.c | 36 ++++++++++++++++++++++++++
gcc/testsuite/c-c++-common/musttail3.c | 31 ++++++++++++++++++++++
gcc/testsuite/c-c++-common/musttail4.c | 19 ++++++++++++++
4 files changed, 103 insertions(+)
create mode 100644 gcc/testsuite/c-c++-common/musttail1.c
create mode 100644 gcc/testsuite/c-c++-common/musttail2.c
create mode 100644 gcc/testsuite/c-c++-common/musttail3.c
create mode 100644 gcc/testsuite/c-c++-common/musttail4.c
diff --git a/gcc/testsuite/c-c++-common/musttail1.c
b/gcc/testsuite/c-c++-common/musttail1.c
new file mode 100644
index 000000000000..476185e3ed4b
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/musttail1.c
@@ -0,0 +1,17 @@
+/* { dg-do compile { target tail_call } } */
+/* { dg-options "-O2" } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+/* { dg-additional-options "-std=c23" { target c } } */
+/* { dg-additional-options "-fdelayed-branch" { target sparc*-*-* } } */
+
+int __attribute__((noinline,noclone))
+callee (int i)
+{
+ return i * i;
+}
+
+int __attribute__((noinline,noclone))
+caller (int i)
+{
+ [[gnu::musttail]] return callee (i + 1);
+}
diff --git a/gcc/testsuite/c-c++-common/musttail2.c
b/gcc/testsuite/c-c++-common/musttail2.c
new file mode 100644
index 000000000000..28f2f68ef13d
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/musttail2.c
@@ -0,0 +1,36 @@
+/* { dg-do compile { target tail_call } } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+/* { dg-additional-options "-std=c23" { target c } } */
+
+struct box { char field[256]; int i; };
+
+int __attribute__((noinline,noclone))
+test_2_callee (int i, struct box b)
+{
+ if (b.field[0])
+ return 5;
+ return i * i;
+}
+
+int __attribute__((noinline,noclone))
+test_2_caller (int i)
+{
+ struct box b;
+ [[gnu::musttail]] return test_2_callee (i + 1, b); /* { dg-error "cannot
tail-call: " } */
+}
+
+extern void setjmp (void);
+void
+test_3 (void)
+{
+ [[gnu::musttail]] return setjmp (); /* { dg-error "cannot tail-call: " } */
+}
+
+typedef void (fn_ptr_t) (void);
+volatile fn_ptr_t fn_ptr;
+
+void
+test_5 (void)
+{
+ [[gnu::musttail]] return fn_ptr (); /* { dg-error "cannot tail-call: " } */
+}
diff --git a/gcc/testsuite/c-c++-common/musttail3.c
b/gcc/testsuite/c-c++-common/musttail3.c
new file mode 100644
index 000000000000..fdbb292944ad
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/musttail3.c
@@ -0,0 +1,31 @@
+/* { dg-do compile { target tail_call } } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+/* { dg-additional-options "-std=c23" { target c } } */
+
+extern int foo2 (int x, ...);
+
+struct str
+{
+ int a, b;
+};
+
+struct str
+cstruct (int x)
+{
+ if (x < 10)
+ [[clang::musttail]] return cstruct (x + 1);
+ return ((struct str){ x, 0 });
+}
+
+int
+foo (int x)
+{
+ if (x < 10)
+ [[clang::musttail]] return foo2 (x, 29);
+ if (x < 100)
+ {
+ int k = foo (x + 1);
+ [[clang::musttail]] return k; /* { dg-error "cannot tail-call: " } */
+ }
+ return x;
+}
diff --git a/gcc/testsuite/c-c++-common/musttail4.c
b/gcc/testsuite/c-c++-common/musttail4.c
new file mode 100644
index 000000000000..7bf44816f14a
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/musttail4.c
@@ -0,0 +1,19 @@
+/* { dg-do compile { target tail_call } } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+/* { dg-additional-options "-std=c23" { target c } } */
+
+struct box { char field[64]; int i; };
+
+struct box __attribute__((noinline,noclone))
+returns_struct (int i)
+{
+ struct box b;
+ b.i = i * i;
+ return b;
+}
+
+int __attribute__((noinline,noclone))
+test_1 (int i)
+{
+ [[gnu::musttail]] return returns_struct (i * 5).i; /* { dg-error "cannot
tail-call: " } */
+}
--
2.43.0
