From 44dba79124c73585812fa781e425c8a0644c01ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Mi=C4=85sko?= <tomasz.miasko@gmail.com>
Date: Tue, 3 Mar 2020 00:00:00 +0000
Subject: [PATCH] Add regression test for linking issue with start-group /
 end-group

---
 .../run-make-fulldeps/issue-69368/Makefile    | 18 ++++++++++
 src/test/run-make-fulldeps/issue-69368/a.rs   | 16 +++++++++
 src/test/run-make-fulldeps/issue-69368/b.rs   |  8 +++++
 src/test/run-make-fulldeps/issue-69368/c.rs   | 34 +++++++++++++++++++
 4 files changed, 76 insertions(+)
 create mode 100644 src/test/run-make-fulldeps/issue-69368/Makefile
 create mode 100644 src/test/run-make-fulldeps/issue-69368/a.rs
 create mode 100644 src/test/run-make-fulldeps/issue-69368/b.rs
 create mode 100644 src/test/run-make-fulldeps/issue-69368/c.rs

diff --git a/src/test/run-make-fulldeps/issue-69368/Makefile b/src/test/run-make-fulldeps/issue-69368/Makefile
new file mode 100644
index 00000000000..dbb044d8f5d
--- /dev/null
+++ b/src/test/run-make-fulldeps/issue-69368/Makefile
@@ -0,0 +1,18 @@
+-include ../tools.mk
+
+# Test that previously triggered a linker failure with root cause
+# similar to one found in the issue #69368.
+#
+# The crate that provides oom lang item is missing some other lang
+# items. Necessary to prevent the use of start-group / end-group.
+#
+# The weak lang items are defined in a separate compilation units,
+# so that linker could omit them if not used.
+#
+# The crates that need those weak lang items are dependencies of
+# crates that provide them.
+
+all:
+	$(RUSTC) a.rs
+	$(RUSTC) b.rs
+	$(RUSTC) c.rs
diff --git a/src/test/run-make-fulldeps/issue-69368/a.rs b/src/test/run-make-fulldeps/issue-69368/a.rs
new file mode 100644
index 00000000000..726db874637
--- /dev/null
+++ b/src/test/run-make-fulldeps/issue-69368/a.rs
@@ -0,0 +1,16 @@
+#![crate_type = "rlib"]
+#![feature(lang_items)]
+#![feature(panic_unwind)]
+#![no_std]
+
+extern crate panic_unwind;
+
+#[panic_handler]
+pub fn panic_handler(_: &core::panic::PanicInfo) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+extern "C" fn __rust_drop_panic() -> ! {
+    loop {}
+}
diff --git a/src/test/run-make-fulldeps/issue-69368/b.rs b/src/test/run-make-fulldeps/issue-69368/b.rs
new file mode 100644
index 00000000000..4d6af026656
--- /dev/null
+++ b/src/test/run-make-fulldeps/issue-69368/b.rs
@@ -0,0 +1,8 @@
+#![crate_type = "rlib"]
+#![feature(alloc_error_handler)]
+#![no_std]
+
+#[alloc_error_handler]
+pub fn error_handler(_: core::alloc::Layout) -> ! {
+    panic!();
+}
diff --git a/src/test/run-make-fulldeps/issue-69368/c.rs b/src/test/run-make-fulldeps/issue-69368/c.rs
new file mode 100644
index 00000000000..729c4249a05
--- /dev/null
+++ b/src/test/run-make-fulldeps/issue-69368/c.rs
@@ -0,0 +1,34 @@
+#![crate_type = "bin"]
+#![feature(start)]
+#![no_std]
+
+extern crate alloc;
+extern crate a;
+extern crate b;
+
+use alloc::vec::Vec;
+use core::alloc::*;
+
+struct Allocator;
+
+unsafe impl GlobalAlloc for Allocator {
+    unsafe fn alloc(&self, _: Layout) -> *mut u8 {
+        loop {}
+    }
+
+    unsafe fn dealloc(&self, _: *mut u8, _: Layout) {
+        loop {}
+    }
+}
+
+#[global_allocator]
+static ALLOCATOR: Allocator = Allocator;
+
+#[start]
+fn main(argc: isize, _argv: *const *const u8) -> isize {
+    let mut v = Vec::new();
+    for i in 0..argc {
+        v.push(i);
+    }
+    v.iter().sum()
+}