cargo-binutils

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Hi. I believe you know the cause of this bug.

i am not at all sure this is it but, usually with ARM we specify the GNU/gcc linker rather than LLD with .cargo/config:

[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

have you tried building with the appropriate GNU linker for riskv?

also may be related to: https://github.com/rust-embedded/wg/issues/36#issuecomment-325167189

~/Desktop/rust-sipeed-longan-nano-master$ cargo build Compiling r0 v0.2.2 Compiling panic-abort v0.3.1 Compiling rust-sipeed-longan-nano v0.1.0 (/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master) warning: unnecessary parentheses around assigned value --> src/main.rs:8:25 | 8 | const rcu_apb2en: u32 = (0x4002_1000 + 0x18); | ^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses | = note: #[warn(unused_parens)] on by default

warning: unnecessary parentheses around assigned value --> src/main.rs:10:25 | 10 | const gpioa_ctl0: u32 = (0x4001_0800 + 0x0); | ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses

warning: unnecessary parentheses around assigned value --> src/main.rs:11:25 | 11 | const gpioa_data: u32 = (0x4001_0800 + 0xc); | ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses

warning: unused import: panic_abort --> src/main.rs:13:5 | 13 | use panic_abort; | ^^^^^^^^^^^ | = note: #[warn(unused_imports)] on by default

warning: constant rcu_apb2en should have an upper case name --> src/main.rs:8:7 | 8 | const rcu_apb2en: u32 = (0x4002_1000 + 0x18); | ^^^^^^^^^^ help: convert the identifier to upper case: RCU_APB2EN | = note: #[warn(non_upper_case_globals)] on by default

warning: constant gpioa_ctl0 should have an upper case name --> src/main.rs:10:7 | 10 | const gpioa_ctl0: u32 = (0x4001_0800 + 0x0); | ^^^^^^^^^^ help: convert the identifier to upper case: GPIOA_CTL0

warning: constant gpioa_data should have an upper case name --> src/main.rs:11:7 | 11 | const gpioa_data: u32 = (0x4001_0800 + 0xc); | ^^^^^^^^^^ help: convert the identifier to upper case: GPIOA_DATA

error: linking with riscv32-unknown-elf-gcc failed: exit code: 1 | = note: "riscv32-unknown-elf-gcc" "-L" "/home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.19pbfx1e7ppiz22i.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1gxn96a4ynn6krtc.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1rrq47tcmo7r1d7q.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.2oywxm1qwyrau2j5.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.36wqpyrxaht0bqyw.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.4g879aqcx3v63xcn.rcgu.o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.hpztk5fc5xtxkyj.rcgu.o" "-o" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5" "-Wl,--gc-sections" "-nodefaultlibs" "-L" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps" "-L" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/debug/deps" "-L" "/home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib" "-Wl,-Bstatic" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/libr0-c85b5ab54aceb5f9.rlib" "-Wl,--start-group" "/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/libpanic_abort-37322ac1e75fee7c.rlib" "/home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/librustc_std_workspace_core-1bd0d3673780d693.rlib" "/home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcore-5aec724f1f867fb1.rlib" "-Wl,--end-group" "/home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib" "-Tlink.x" "-Wl,-Bdynamic" = note: /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.19pbfx1e7ppiz22i.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.19pbfx1e7ppiz22i.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1gxn96a4ynn6krtc.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1gxn96a4ynn6krtc.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1rrq47tcmo7r1d7q.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.1rrq47tcmo7r1d7q.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.2oywxm1qwyrau2j5.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.2oywxm1qwyrau2j5.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.36wqpyrxaht0bqyw.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.36wqpyrxaht0bqyw.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.4g879aqcx3v63xcn.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.4g879aqcx3v63xcn.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.hpztk5fc5xtxkyj.rcgu.o: can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/rust_sipeed_longan_nano-2df4b3c694b8dfb5.hpztk5fc5xtxkyj.rcgu.o /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcore-5aec724f1f867fb1.rlib(core-5aec724f1f867fb1.core.aewkdyag-cgu.0.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcore-5aec724f1f867fb1.rlib(core-5aec724f1f867fb1.core.aewkdyag-cgu.0.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/libpanic_abort-37322ac1e75fee7c.rlib(panic_abort-37322ac1e75fee7c.panic_abort.9h2oa02d-cgu.0.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/Desktop/rust-sipeed-longan-nano-master/target/riscv32imac-unknown-none-elf/debug/deps/libpanic_abort-37322ac1e75fee7c.rlib(panic_abort-37322ac1e75fee7c.panic_abort.9h2oa02d-cgu.0.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.107.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.107.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.21.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.21.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.27.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.27.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.39.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.39.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.41.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.41.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.70.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.70.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.73.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.73.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.75.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.75.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.78.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.78.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.80.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.80.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.87.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.87.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.93.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.93.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.98.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.98.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.125.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.125.rcgu.o) /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.17.rcgu.o): can't link soft-float modules with double-float modules /usr/local/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld: failed to merge target specific data of file /home/oceanfish81/.rustup/toolchains/nightly-i686-unknown-linux-gnu/lib/rustlib/riscv32imac-unknown-none-elf/lib/libcompiler_builtins-deaf2d068ddf18c0.rlib(compiler_builtins-deaf2d068ddf18c0.compiler_builtins.7egkskwx-cgu.17.rcgu.o) collect2: error: ld returned 1 exit status

error: aborting due to previous error; 7 warnings emitted

error: could not compile rust-sipeed-longan-nano

To learn more, run the command again with --verbose.

That's with

[target.riscv32imac-unknown-none-elf] linker = "riscv32-unknown-elf-gcc"

However with

[target.riscv32imac-unknown-none-elf] linker = "riscv32-unknown-elf-ld"

I didn't get any error:

$ cargo build Compiling panic-abort v0.3.1 Compiling r0 v0.2.2 Compiling rust-sipeed-longan-nano v0.1.0 (/home/oceanfish81/Desktop/rust-sipeed-longan-nano-master) warning: unnecessary parentheses around assigned value --> src/main.rs:8:25 | 8 | const rcu_apb2en: u32 = (0x4002_1000 + 0x18); | ^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses | = note: #[warn(unused_parens)] on by default

warning: unnecessary parentheses around assigned value --> src/main.rs:10:25 | 10 | const gpioa_ctl0: u32 = (0x4001_0800 + 0x0); | ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses

warning: unnecessary parentheses around assigned value --> src/main.rs:11:25 | 11 | const gpioa_data: u32 = (0x4001_0800 + 0xc); | ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses

warning: unused import: panic_abort --> src/main.rs:13:5 | 13 | use panic_abort; | ^^^^^^^^^^^ | = note: #[warn(unused_imports)] on by default

warning: constant rcu_apb2en should have an upper case name --> src/main.rs:8:7 | 8 | const rcu_apb2en: u32 = (0x4002_1000 + 0x18); | ^^^^^^^^^^ help: convert the identifier to upper case: RCU_APB2EN | = note: #[warn(non_upper_case_globals)] on by default

warning: constant gpioa_ctl0 should have an upper case name --> src/main.rs:10:7 | 10 | const gpioa_ctl0: u32 = (0x4001_0800 + 0x0); | ^^^^^^^^^^ help: convert the identifier to upper case: GPIOA_CTL0

warning: constant gpioa_data should have an upper case name --> src/main.rs:11:7 | 11 | const gpioa_data: u32 = (0x4001_0800 + 0xc); | ^^^^^^^^^^ help: convert the identifier to upper case: GPIOA_DATA

warning: 7 warnings emitted

Finished dev [unoptimized + debuginfo] target(s) in 0.95s

I am able to see the binary file, as described here - it is just I have my toolchain offers "riscv32-unknown-elf" prefix, for the executibles, instead of "riscv-nuclei-elf-"

ahh can't link soft-float modules with double-float modules is familiar, though i can't find the issues i tracked down to solve this. on armhf this is sometimes resolved by adding a linker path to the correct libraries for the ABI, something like this in .cargo/config from an armhf project of mine:

[target.thumbv7em-none-eabihf]

rustflags = [
   "-C", "linker=arm-none-eabi-gcc",
   "-C", "link-arg=-L/usr/lib/arm-none-eabi/lib/thumb/v7e-m/fpv4-sp/hard/",
]

I am able to see the binary file, as described here - it is just I have my toolchain offers "riscv32-unknown-elf" prefix, for the executibles, instead of "riscv-nuclei-elf-"

great! you should just be able to change file paths then?

ahh can't link soft-float modules with double-float modules is familiar, though i can't find the issues i tracked down to solve this. on armhf this is sometimes resolved by adding a linker path to the correct libraries for the ABI, something like this in .cargo/config from an armhf project of mine:

[target.thumbv7em-none-eabihf]

rustflags = [
   "-C", "linker=arm-none-eabi-gcc",
   "-C", "link-arg=-L/usr/lib/arm-none-eabi/lib/thumb/v7e-m/fpv4-sp/hard/",
]

@lupyuen , could you help here?

Let's ask those who know how to do that properly.

I am able to see the binary file, as described here - it is just I have my toolchain offers "riscv32-unknown-elf" prefix, for the executibles, instead of "riscv-nuclei-elf-"

great! you should just be able to change file paths then? Not really. After replacing "-gcc" with "-ld" I got a binary, on the output - but has an oddly small size (a bit larger then 1 KB, compared to 20+ KB for known firmware binaries.) After downloading via DFU my Longan Nano does not boot even a LED related demo project. Something is wrong.

CC @zsdonghao @junhuanchen @myuanz @QinYUN575 @btx000 @pcotret @Zepan @MindShow

It says can't link soft-float modules with double-float modules, what could this 'double-float module' be? There's no float and double extension in rust's riscv32imac target.

I could try to reproduce again an share all generated artifacts

After downloading via DFU my Longan Nano does not boot even a LED related demo project. Something is wrong. CC @zsdonghao @junhuanchen @myuanz @QinYUN575 @btx000 @pcotret @Zepan @MindShow

The only problem I had related to this was that my Longan Nano was kinda stuck. https://github.com/sipeed/Longan-DOC/blame/master/en/get_started/blink.md#L104

Development board hold down the BOOT key, then press the RESET button to restart development board and then release the BOOT button to enter DFU mode.

i am not at all sure this is it but, usually with ARM we specify the GNU/gcc linker rather than LLD with .cargo/config:

Who is "we" and why are you doing that?

I see that something is rather wrong with the config.

For instance I tried to build https://github.com/pdx-cs-rust/nanoball - but it failed, with my recent ~/.cargo/config file. Once I removed it (but didn't touch anything inside ./.cargo/config file ) - I was able to build the project. I see the animation on Longan Nano's LCD screen, right now.

Who is "we" and why are you doing that?

org project, because inexplicably when you start linking external c libraries the linker seems to break in a variety of horrifying ways / stop being able to infer a bunch of things like this correctly.

what could this 'double-float module' be

oh yeah this is, v different from what i was thinking.

@barafael , experiencing an uncertain situation with your demos: https://github.com/barafael/rust-sipeed-longan-DAC/issues/1