From 9975ad073acc408ee1bb4fe776daeeb175aa8816 Mon Sep 17 00:00:00 2001 From: Brian Anderson Date: Wed, 6 Jun 2012 12:42:56 -0700 Subject: [PATCH] rustc: Add comments about linking to libm --- src/rustc/back/link.rs | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/src/rustc/back/link.rs b/src/rustc/back/link.rs index 62dc467143ee..c3e1b4da7727 100644 --- a/src/rustc/back/link.rs +++ b/src/rustc/back/link.rs @@ -636,7 +636,12 @@ fn link_binary(sess: session, // On linux librt and libdl are an indirect dependencies via rustrt, // and binutils 2.22+ won't add them automatically if sess.targ_cfg.os == session::os_linux { - cc_args += ["-lrt", "-ldl", "-lm"]; + cc_args += ["-lrt", "-ldl"]; + + // LLVM implements the `frem` instruction as a call to `fmod`, + // which lives in libm. Similar to above, on some linuxes we + // have to be explicit about linking to it. See #2510 + cc_args += ["-lm"]; } if sess.targ_cfg.os == session::os_freebsd {