Rename the test-multiprecision feature to build-mpfr

Currently the features that control what we test against are
`build-musl` and `test-multiprecision`. I didn't name them very
consistently and there isn't really any reason for that.

Rename `test-multiprecision` to `build-mpfr` to better reflect what it
actually does and to be more consistent with `build-musl`.

Author: tgross35

libm/.github/workflows/main.yml

@@ -133,7 +133,7 @@ jobs:
       run: ./ci/download-musl.sh
     - run: |
         cargo clippy --all \
-          --features libm-test/build-musl,libm-test/test-multiprecision \
+          --features libm-test/build-musl,libm-test/build-mpfr \
           --all-targets
 
   builtins:
@@ -241,7 +241,7 @@ jobs:
           fi
 
           LIBM_EXTENSIVE_TESTS="$CHANGED" cargo t \
-            --features test-multiprecision,unstable \
+            --features build-mpfr,unstable \
             --profile release-checked \
             -- extensive
       - name: Print test logs if available

libm/CONTRIBUTING.md

@@ -69,7 +69,7 @@ If you'd like to run tests with randomized inputs that get compared against
 infinite-precision results, run:
 
 ```sh
-cargo test --features libm-test/test-multiprecision,libm-test/build-musl --release
+cargo test --features libm-test/build-mpfr,libm-test/build-musl --release
 ```
 
 The multiprecision tests use the [`rug`] crate for bindings to MPFR. MPFR can

libm/ci/run.sh

@@ -44,11 +44,11 @@ case "$target" in
     # Targets that aren't cross compiled work fine
     # FIXME(ci): we should be able to enable aarch64 Linux here once GHA
     # support rolls out.
-    x86_64*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
-    i686*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
-    i586*) extra_flags="$extra_flags --features libm-test/test-multiprecision --features gmp-mpfr-sys/force-cross" ;;
+    x86_64*) extra_flags="$extra_flags --features libm-test/build-mpfr" ;;
+    i686*) extra_flags="$extra_flags --features libm-test/build-mpfr" ;;
+    i586*) extra_flags="$extra_flags --features libm-test/build-mpfr --features gmp-mpfr-sys/force-cross" ;;
     # Apple aarch64 is native
-    aarch64*apple*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
+    aarch64*apple*) extra_flags="$extra_flags --features libm-test/build-mpfr" ;;
 esac
 
 # FIXME: `STATUS_DLL_NOT_FOUND` testing macros on CI.

libm/crates/libm-test/Cargo.toml

@@ -12,7 +12,7 @@ unstable-float = ["libm/unstable-float", "rug?/nightly-float"]
 
 # Generate tests which are random inputs and the outputs are calculated with
 # musl libc.
-test-multiprecision = ["dep:az", "dep:rug", "dep:gmp-mpfr-sys"]
+build-mpfr = ["dep:az", "dep:rug", "dep:gmp-mpfr-sys"]
 
 # Build our own musl for testing and benchmarks
 build-musl = ["dep:musl-math-sys"]

libm/crates/libm-test/src/lib.rs

@@ -5,7 +5,7 @@
 pub mod domain;
 mod f8_impl;
 pub mod gen;
-#[cfg(feature = "test-multiprecision")]
+#[cfg(feature = "build-mpfr")]
 pub mod mpfloat;
 mod num;
 pub mod op;

libm/crates/libm-test/src/run_cfg.rs

@@ -126,7 +126,7 @@ impl TestEnv {
         let id = ctx.fn_ident;
         let op = id.math_op();
 
-        let will_run_mp = cfg!(feature = "test-multiprecision");
+        let will_run_mp = cfg!(feature = "build-mpfr");
 
         // Tests are pretty slow on non-64-bit targets, x86 MacOS, and targets that run in QEMU. Start
         // with a reduced number on these platforms.

libm/crates/libm-test/tests/multiprecision.rs

@@ -1,6 +1,6 @@
 //! Test with "infinite precision"
 
-#![cfg(feature = "test-multiprecision")]
+#![cfg(feature = "build-mpfr")]
 
 use libm_test::domain::HasDomain;
 use libm_test::gen::random::RandomInput;

libm/crates/libm-test/tests/z_extensive/main.rs

@@ -1,14 +1,14 @@
 //! `main` is just a wrapper to handle configuration.
 
-#[cfg(not(feature = "test-multiprecision"))]
+#[cfg(not(feature = "build-mpfr"))]
 fn main() {
     eprintln!("multiprecision not enabled; skipping extensive tests");
 }
 
-#[cfg(feature = "test-multiprecision")]
+#[cfg(feature = "build-mpfr")]
 mod run;
 
-#[cfg(feature = "test-multiprecision")]
+#[cfg(feature = "build-mpfr")]
 fn main() {
     run::run();
 }