Enable MPFR on i586

Author: tgross35

ci/docker/i586-unknown-linux-gnu/Dockerfile

@@ -2,4 +2,4 @@ FROM ubuntu:24.04
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
-    gcc-multilib libc6-dev ca-certificates
+    gcc-multilib m4 make libc6-dev ca-certificates

ci/run.sh

@@ -47,6 +47,7 @@ case "$target" in
     x86_64*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
     # i686 works fine, i586 does not
     i686*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
+    i586*) extra_flags="$extra_flags --features libm-test/test-multiprecision --features libm-test/force-cross" ;;
     # Apple aarch64 is native
     aarch64*apple*) extra_flags="$extra_flags --features libm-test/test-multiprecision" ;;
 esac

crates/libm-test/Cargo.toml

@@ -12,20 +12,23 @@ 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"]
+test-multiprecision = ["dep:az", "dep:rug", "dep:gmp-mpfr-sys"]
 
 # Build our own musl for testing and benchmarks
 build-musl = ["dep:musl-math-sys"]
 
 # Enable report generation without bringing in more dependencies by default
 benchmarking-reports = ["criterion/plotters", "criterion/html_reports"]
 
+force-cross = ["gmp-mpfr-sys/force-cross"]
+
 # Run with a reduced set of benchmarks, such as for CI
 short-benchmarks = []
 
 [dependencies]
 anyhow = "1.0.90"
 az = { version = "1.2.1", optional = true }
+gmp-mpfr-sys = { version = "1.6.4", optional = true, default-features = false, features = ["mpfr"] }
 indicatif = { version = "0.17.9", default-features = false }
 libm = { path = "../..", features = ["unstable-public-internals"] }
 libm-macros = { path = "../libm-macros" }