[beta] rustc_const_math: undefined reference to `rust_eh_personality' #40251
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Description
While testing 1.16.0-beta.3 builds on Fedora, I'm getting a link error for rust_eh_personality on i686 and armv7hl, but not on the rest of arches which are all 64-bit. I'm also seeing this only on Fedora 24/25 with LLVM-3.8, not on Fedora rawhide with LLVM-3.9.
Compiling rustc_const_math v0.0.0 (file:///builddir/build/BUILD/rustc-beta-src/src/librustc_const_math)
error: linking with `cc` failed: exit code: 1
|
= note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m32" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1/lib/rustlib/i686-unknown-linux-gnu/lib" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps/rustc_const_math-3eb308102ead4d97.0.o" "-o" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps/librustc_const_math-3eb308102ead4d97.so" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps/rustc_const_math-3eb308102ead4d97.metadata.o" "-Wl,-O1" "-nodefaultlibs" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/release/deps" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1/lib/rustlib/i686-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,-Bdynamic" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "syntax-361284d4f5fb5940" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "rustc_data_structures-b6582de1b9706e19" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "rustc_errors-11fbf09a24007839" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "log-15b4e8336a0a4a4a" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1/lib/rustlib/i686-unknown-linux-gnu/lib" "-l" "term-1f8b28580ffa517e" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "syntax_pos-091c6cfef6161c2c" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps" "-l" "serialize-41fa6f76166d8a6e" "-L" "/builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1/lib/rustlib/i686-unknown-linux-gnu/lib" "-l" "std-675d08ed24b25a61" "/tmp/rustc.QQnGwqNawKRQ/libcompiler_builtins-55bf5e5eafc786cf.rlib" "-l" "dl" "-l" "rt" "-l" "pthread" "-l" "gcc_s" "-l" "c" "-l" "m" "-l" "rt" "-l" "util" "-shared" "-Wl,-z,relro,-z,now"
= note: /builddir/build/BUILD/rustc-beta-src/build/i686-unknown-linux-gnu/stage1-rustc/i686-unknown-linux-gnu/release/deps/rustc_const_math-3eb308102ead4d97.0.o:(.data.DW.ref.rust_eh_personality[DW.ref.rust_eh_personality]+0x0): undefined reference to `rust_eh_personality'
collect2: error: ld returned 1 exit status
error: aborting due to previous error
error: Could not compile `rustc_const_math`.
The problem seems exactly like that described in commit 92e6c53, part of #38482. On the F25 system, the stage1 libcompiler_builtins.rlib contains undefined references to rust_eh_personality, and the working rawhide system does not. I don't know how they identified where the reference is coming from, but since this seems dependent on the LLVM version, I guess there's still some missing optimization or analysis that needs to be cleaned up.
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