[WIP] parameterize -C prefer-dynamic

src/test/ui/dylibs/README.md

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+This directory is a collection of tests of how dylibs and rlibs are compiled and loaded.
+
+It is mostly an exploration checkpointing the current state of Rust.
+
+We tend to advise people to try make at least one format available all the way
+ up: e.g. all rlibs or all dylibs. But it is good to keep track of how we are
+ handling other combinations.
+
+There are seven auxiliary crates: `a`,`i`,`j`,`m`,`s`,`t`,`z`. Each top-level
+test in this directory varies which of the auxiliary crates are compiled to
+dylibs and which are compiled to rlibs.
+
+The seven auxiliary form a dependence graph that looks like this (a pair of
+diamonds):
+
+```graphviz
+   z -> s; s -> m; m -> i; i -> a
+   z -> t; t -> m; m -> j; j -> a
+// ~    ~~~~    ~~~~    ~~~~    ~
+// |     |        |      |      |
+// |     |        |      |      +- basement
+// |     |        |      |
+// |     |        |      +- ground
+// |     |        |
+// |     |        +- middle
+// |     |
+// |     +- upper
+// |
+// +- roof
+```

src/test/ui/dylibs/auxiliary/a_basement_core.rs

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+pub fn a() -> String {
+    format!("a_basement_core")
+}
+
+pub fn a_addr() -> usize { a as fn() -> String as *const u8 as usize }

src/test/ui/dylibs/auxiliary/a_basement_dynamic.rs

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+#![crate_name="a_basement"]
+#![crate_type="dylib"]
+
+mod a_basement_core;
+pub use a_basement_core::*;

src/test/ui/dylibs/auxiliary/a_basement_rlib.rs

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+#![crate_name="a_basement"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+mod a_basement_core;
+pub use a_basement_core::*;

src/test/ui/dylibs/auxiliary/i_ground_core.rs

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+pub fn i() -> String {
+    format!("i_ground_core -> ({})", a::a())
+}
+
+pub fn i_addr() -> usize { i as fn() -> String as *const u8 as usize }
+
+pub fn a_addr() -> usize { a::a_addr() }

src/test/ui/dylibs/auxiliary/i_ground_dynamic.rs

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+#![crate_name="i_ground"]
+#![crate_type="dylib"]
+
+pub extern crate a_basement as a;
+
+mod i_ground_core;
+pub use i_ground_core::*;

src/test/ui/dylibs/auxiliary/i_ground_rlib.rs

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+#![crate_name="i_ground"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate a_basement as a;
+
+mod i_ground_core;
+pub use i_ground_core::*;

src/test/ui/dylibs/auxiliary/j_ground_core.rs

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+pub fn j() -> String {
+    format!("j_ground_core -> ({})", a::a())
+}
+
+pub fn j_addr() -> usize { j as fn() -> String as *const u8 as usize }
+
+pub fn a_addr() -> usize { a::a_addr() }

src/test/ui/dylibs/auxiliary/j_ground_dynamic.rs

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+#![crate_name="j_ground"]
+#![crate_type="dylib"]
+
+pub extern crate a_basement as a;
+
+mod j_ground_core;
+pub use j_ground_core::*;

src/test/ui/dylibs/auxiliary/j_ground_rlib.rs

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+#![crate_name="j_ground"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate a_basement as a;
+
+mod j_ground_core;
+pub use j_ground_core::*;

src/test/ui/dylibs/auxiliary/m_middle_core.rs

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+pub fn m() -> String {
+    format!("m_middle_core -> ({}), -> ({})", i::i(), j::j())
+}
+
+pub fn m_addr() -> usize { m as fn() -> String as *const u8 as usize }
+
+pub fn i_addr() -> usize { i::i_addr() }
+
+pub fn j_addr() -> usize { j::j_addr() }
+
+pub fn i_a_addr() -> usize { i::a_addr() }
+
+pub fn j_a_addr() -> usize { j::a_addr() }

src/test/ui/dylibs/auxiliary/m_middle_dynamic.rs

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+#![crate_name="m_middle"]
+#![crate_type="dylib"]
+
+pub extern crate i_ground as i;
+pub extern crate j_ground as j;
+
+mod m_middle_core;
+pub use m_middle_core::*;

src/test/ui/dylibs/auxiliary/m_middle_rlib.rs

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+#![crate_name="m_middle"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate i_ground as i;
+pub extern crate j_ground as j;
+
+mod m_middle_core;
+pub use m_middle_core::*;

src/test/ui/dylibs/auxiliary/s_upper_core.rs

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+pub fn s() -> String {
+    format!("s_upper_core -> ({})", m::m())
+}
+
+pub fn s_addr() -> usize { s as fn() -> String as *const u8 as usize }
+
+pub fn m_addr() -> usize { m::m_addr() }
+
+pub fn m_i_addr() -> usize { m::i_addr() }
+
+pub fn m_j_addr() -> usize { m::j_addr() }
+
+pub fn m_i_a_addr() -> usize { m::i_a_addr() }
+
+pub fn m_j_a_addr() -> usize { m::j_a_addr() }

src/test/ui/dylibs/auxiliary/s_upper_dynamic.rs

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+#![crate_name="s_upper"]
+#![crate_type="dylib"]
+
+pub extern crate m_middle as m;
+
+mod s_upper_core;
+pub use s_upper_core::*;

src/test/ui/dylibs/auxiliary/s_upper_rlib.rs

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+#![crate_name="s_upper"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate m_middle as m;
+
+mod s_upper_core;
+pub use s_upper_core::*;

src/test/ui/dylibs/auxiliary/t_upper_core.rs

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+pub fn t() -> String {
+    format!("t_upper_core -> {}", m::m())
+}
+
+pub fn t_addr() -> usize { t as fn() -> String as *const u8 as usize }
+
+pub fn m_addr() -> usize { m::m_addr() }
+
+pub fn m_i_addr() -> usize { m::i_addr() }
+
+pub fn m_j_addr() -> usize { m::j_addr() }
+
+pub fn m_i_a_addr() -> usize { m::i_a_addr() }
+
+pub fn m_j_a_addr() -> usize { m::j_a_addr() }

src/test/ui/dylibs/auxiliary/t_upper_dynamic.rs

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+#![crate_name="t_upper"]
+#![crate_type="dylib"]
+
+pub extern crate m_middle as m;
+
+mod t_upper_core;
+pub use t_upper_core::*;

src/test/ui/dylibs/auxiliary/t_upper_rlib.rs

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+#![crate_name="t_upper"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate m_middle as m;
+
+mod t_upper_core;
+pub use t_upper_core::*;

src/test/ui/dylibs/auxiliary/z_roof_core.rs

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+pub fn z() -> String {
+    format!("z_roof_core -> ({}), -> ({})", s::s(), t::t())
+}
+
+pub fn z_addr() -> usize { z as fn() -> String as *const u8 as usize }
+
+pub fn s_addr() -> usize { s::s_addr() }
+
+pub fn t_addr() -> usize { t::t_addr() }
+
+pub fn s_m_addr() -> usize { s::m_addr() }
+
+pub fn t_m_addr() -> usize { t::m_addr() }
+
+pub fn s_m_i_addr() -> usize { s::m_i_addr() }
+
+pub fn s_m_j_addr() -> usize { s::m_j_addr() }
+
+pub fn t_m_i_addr() -> usize { t::m_i_addr() }
+
+pub fn t_m_j_addr() -> usize { t::m_j_addr() }
+
+pub fn s_m_i_a_addr() -> usize { s::m_i_a_addr() }
+
+pub fn s_m_j_a_addr() -> usize { s::m_j_a_addr() }
+
+pub fn t_m_i_a_addr() -> usize { t::m_i_a_addr() }
+
+pub fn t_m_j_a_addr() -> usize { t::m_j_a_addr() }

src/test/ui/dylibs/auxiliary/z_roof_dynamic.rs

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+#![crate_name="z_roof"]
+#![crate_type="dylib"]
+
+pub extern crate s_upper as s;
+pub extern crate t_upper as t;
+
+mod z_roof_core;
+pub use z_roof_core::*;

src/test/ui/dylibs/auxiliary/z_roof_rlib.rs

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+#![crate_name="z_roof"]
+#![crate_type="rlib"]
+
+// no-prefer-dynamic : flag controls both `-C prefer-dynamic` *and* overrides the
+// output crate type for this file.
+
+pub extern crate s_upper as s;
+pub extern crate t_upper as t;
+
+mod z_roof_core;
+pub use z_roof_core::*;

src/test/ui/dylibs/diamonds-ddddddd.rs

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+// run-pass
+
+// All the dependencies are dylibs, so we can successfully link them all and run them.
+
+// aux-build: a_basement_dynamic.rs
+// aux-build: i_ground_dynamic.rs
+// aux-build: j_ground_dynamic.rs
+// aux-build: m_middle_dynamic.rs
+// aux-build: s_upper_dynamic.rs
+// aux-build: t_upper_dynamic.rs
+// aux-build: z_roof_dynamic.rs
+
+extern crate z_roof as z;
+
+mod diamonds_core;
+
+fn main() {
+    diamonds_core::sanity_check();
+    diamonds_core::check_linked_function_equivalence();
+}

src/test/ui/dylibs/diamonds-ddddrrr.rs

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+// run-pass
+
+// There is no sharing of an rlib via two dylibs, and thus we can link and run
+// this program.
+
+// aux-build: a_basement_dynamic.rs
+// aux-build: i_ground_dynamic.rs
+// aux-build: j_ground_dynamic.rs
+// aux-build: m_middle_dynamic.rs
+// aux-build: s_upper_rlib.rs
+// aux-build: t_upper_rlib.rs
+// aux-build: z_roof_rlib.rs
+
+extern crate z_roof as z;
+
+mod diamonds_core;
+
+fn main() {
+    diamonds_core::sanity_check();
+    diamonds_core::check_linked_function_equivalence();
+}

src/test/ui/dylibs/diamonds-dddrdd.rs

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+// build-fail
+
+// This fails to compile because the middle static library (m) is included via
+// two dylibs: `s_upper` and `t_upper`.
+
+// aux-build: a_basement_dynamic.rs
+// aux-build: i_ground_dynamic.rs
+// aux-build: j_ground_dynamic.rs
+// aux-build: m_middle_rlib.rs
+// aux-build: s_upper_dynamic.rs
+// aux-build: t_upper_dynamic.rs
+
+extern crate s_upper as s;
+extern crate t_upper as t;
+
+fn main() {
+    s::s(); t::t();
+}

src/test/ui/dylibs/diamonds-dddrdd.stderr

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+error: cannot satisfy dependencies so `m_middle` only shows up once (two static copies from multiple different locations, via [`s_upper`, `t_upper`])
+   |
+   = help: having upstream crates all available in one format will likely make this go away
+
+error: aborting due to previous error
+

src/test/ui/dylibs/diamonds-dddrrrr.rs

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+// run-pass
+
+// There is no sharing of an rlib via two dylibs, and thus we can link and run
+// this program.
+
+// aux-build: a_basement_dynamic.rs
+// aux-build: i_ground_dynamic.rs
+// aux-build: j_ground_dynamic.rs
+// aux-build: m_middle_rlib.rs
+// aux-build: s_upper_rlib.rs
+// aux-build: t_upper_rlib.rs
+// aux-build: z_roof_rlib.rs
+
+extern crate z_roof as z;
+
+mod diamonds_core;
+
+fn main() {
+    diamonds_core::sanity_check();
+    diamonds_core::check_linked_function_equivalence();
+}

src/test/ui/dylibs/diamonds-rdd.rs

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+// build-fail
+
+// This fails to compile because the static library foundation (a) is
+// included via two dylibs: `i_ground` and `j_ground`.
+
+// aux-build: a_basement_rlib.rs
+// aux-build: i_ground_dynamic.rs
+// aux-build: j_ground_dynamic.rs
+
+extern crate i_ground as i;
+extern crate j_ground as j;
+
+fn main() {
+    i::i(); j::j();
+}

src/test/ui/dylibs/diamonds-rdd.stderr

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+error: cannot satisfy dependencies so `a_basement` only shows up once (two static copies from multiple different locations, via [`i_ground`, `j_ground`])
+   |
+   = help: having upstream crates all available in one format will likely make this go away
+
+error: aborting due to previous error
+