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I get this error building Rust 61443dc (master as of Dec 1) on Debian:
$ rm -fr x86_64-unknown-linux-gnu/
$ ./configure
…
$ make -j10
…
cp: x86_64-unknown-linux-gnu/stage2/lib/librustc.so
compile_and_link: x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/librustpkg.so
compile_and_link: x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/librustdoc.so
error: linking with `cc` failed: exit code: 1
note: cc arguments: '-m64' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-o' 'x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/bin/rustc' 'x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/bin/rustc.o' '-Wl,--as-needed' '-Wl,-O1' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-lstd-6425b930ca146ae9-0.9-pre' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-lrustuv-a13edc95d75df17-0.9-pre' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-lextra-aaa96aab146eb38e-0.9-pre' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-lsyntax-2bb2d559d93ae8f0-0.9-pre' '-L/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-lrustc-8581899a03b03e-0.9-pre' '-Lx86_64-unknown-linux-gnu/rt/libuv' '-Lx86_64-unknown-linux-gnu/rt/uv_support' '-L/home/keegan/proj/rust/rust/.rust' '-L/home/keegan/proj/rust/rust' '-lmorestack' '-Wl,-rpath,$ORIGIN/../lib' '-Wl,-rpath,/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib' '-Wl,-rpath,/usr/local/lib/rustc/x86_64-unknown-linux-gnu/lib'
note: /home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'ceil'
/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'log10'
/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'pow'
/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'floor'
/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'fmod'
/home/keegan/proj/rust/rust/x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/lib/libextra-aaa96aab146eb38e-0.9-pre.so: error: undefined reference to 'trunc'
collect2: error: ld returned 1 exit status
error: aborting due to previous error
task 'rustc' failed at 'explicit failure', /home/keegan/proj/rust/rust/src/libsyntax/diagnostic.rs:102
task '<main>' failed at 'explicit failure', /home/keegan/proj/rust/rust/src/librustc/lib.rs:396
make: *** [x86_64-unknown-linux-gnu/stage1/lib/rustc/x86_64-unknown-linux-gnu/bin/rustc] Error 101
make: *** Waiting for unfinished jobs....
I get the same message if I run make again. But the error might be nondeterministic; on the previous clean build the missing symbol was dlerror.
I see that neither -lm nor -ldl is present in the command line above.
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