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LLVM: ld.lld: warning: cannot find entry symbol _start; not setting start address #1813

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opened 2024-08-13 10:37:58 -05:00 by matsobdev · 4 comments
matsobdev commented 2024-08-13 10:37:58 -05:00 (Migrated from github.com)

Both on RP2040 and RP2350, with Ninja or without this happens on Windows:

PICO_SDK_PATH is E:/Download/Pico_2/pico-sdk-2.0.0
Target board (PICO_BOARD) is 'pico2'.
Using board configuration from E:/Download/Pico_2/pico-sdk-2.0.0/src/boards/include/boards/pico2.h
Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'.
Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang'
Setting default C library to picolibc as LLVM appears to be using it
-- The C compiler identification is Clang 18.1.3
-- The CXX compiler identification is Clang 18.1.3
-- The ASM compiler identification is Clang
-- Found assembler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Build type is Release
-- Found Python3: C:/DEV/Python/python.exe (found version "3.8.10") found components: Interpreter
TinyUSB available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB.
BTstack available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/btstack
cyw43-driver available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/cyw43-driver
lwIP available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/lwip
mbedtls available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/mbedtls
-- Configuring done
-- Generating done
-- Build files have been written to: W:/pico2/pico2/build
[84/84] Linking CXX executable project_name.elf
ld.lld: warning: cannot find entry symbol _start; not setting start address

and this on Ubuntu 20.04:

mateush@mateush:~/pico2/pico2$ cmake -G Ninja -S ~/pico2/pico2 -B ~/pico2/pico2/build
PICO_SDK_PATH is /home/mateush/pico-sdk-2.0.0
Target board (PICO_BOARD) is 'pico2'.
Using board configuration from /home/mateush/pico-sdk-2.0.0/src/boards/include/boards/pico2.h
Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'.
Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang'
Setting default C library to picolibc as LLVM appears to be using it
-- The C compiler identification is Clang 18.1.3
-- The CXX compiler identification is Clang 18.1.3
-- The ASM compiler identification is Clang
-- Found assembler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Build type is Release
-- Found Python3: /usr/bin/python3.8 (found version "3.8.10") found components: Interpreter 
TinyUSB available at /home/mateush/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB.
BTstack available at /home/mateush/pico-sdk-2.0.0/lib/btstack
cyw43-driver available at /home/mateush/pico-sdk-2.0.0/lib/cyw43-driver
lwIP available at /home/mateush/pico-sdk-2.0.0/lib/lwip
mbedtls available at /home/mateush/pico-sdk-2.0.0/lib/mbedtls
-- Configuring done
-- Generating done
-- Build files have been written to: /home/mateush/pico2/pico2/build
mateush@mateush:~/pico2/pico2$ cmake --build ~/pico2/pico2/build
[2/84] Linking ASM executable pico-sdk/src/rp2350/boot_stage2/bs2_default.elf
ld.lld: warning: cannot find entry symbol _start; not setting start address
[84/84] Linking CXX executable project_name.elf

Similar, but quite not I guess.

Both on RP2040 and RP2350, with Ninja or without this happens on Windows: ``` PICO_SDK_PATH is E:/Download/Pico_2/pico-sdk-2.0.0 Target board (PICO_BOARD) is 'pico2'. Using board configuration from E:/Download/Pico_2/pico-sdk-2.0.0/src/boards/include/boards/pico2.h Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'. Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang' Setting default C library to picolibc as LLVM appears to be using it -- The C compiler identification is Clang 18.1.3 -- The CXX compiler identification is Clang 18.1.3 -- The ASM compiler identification is Clang -- Found assembler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang.exe -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang.exe - skipped -- Detecting C compile features -- Detecting C compile features - done -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: E:/Download/Pico_2/LLVM-ET-Arm-18.1.3-Windows-x86_64/bin/clang++.exe - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done Build type is Release -- Found Python3: C:/DEV/Python/python.exe (found version "3.8.10") found components: Interpreter TinyUSB available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB. BTstack available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/btstack cyw43-driver available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/cyw43-driver lwIP available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/lwip mbedtls available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/mbedtls -- Configuring done -- Generating done -- Build files have been written to: W:/pico2/pico2/build [84/84] Linking CXX executable project_name.elf ld.lld: warning: cannot find entry symbol _start; not setting start address ``` and this on Ubuntu 20.04: ``` mateush@mateush:~/pico2/pico2$ cmake -G Ninja -S ~/pico2/pico2 -B ~/pico2/pico2/build PICO_SDK_PATH is /home/mateush/pico-sdk-2.0.0 Target board (PICO_BOARD) is 'pico2'. Using board configuration from /home/mateush/pico-sdk-2.0.0/src/boards/include/boards/pico2.h Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'. Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang' Setting default C library to picolibc as LLVM appears to be using it -- The C compiler identification is Clang 18.1.3 -- The CXX compiler identification is Clang 18.1.3 -- The ASM compiler identification is Clang -- Found assembler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang - skipped -- Detecting C compile features -- Detecting C compile features - done -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: /home/mateush/LLVM-ET-Arm-18.1.3-Linux-x86_64/bin/clang++ - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done Build type is Release -- Found Python3: /usr/bin/python3.8 (found version "3.8.10") found components: Interpreter TinyUSB available at /home/mateush/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB. BTstack available at /home/mateush/pico-sdk-2.0.0/lib/btstack cyw43-driver available at /home/mateush/pico-sdk-2.0.0/lib/cyw43-driver lwIP available at /home/mateush/pico-sdk-2.0.0/lib/lwip mbedtls available at /home/mateush/pico-sdk-2.0.0/lib/mbedtls -- Configuring done -- Generating done -- Build files have been written to: /home/mateush/pico2/pico2/build mateush@mateush:~/pico2/pico2$ cmake --build ~/pico2/pico2/build [2/84] Linking ASM executable pico-sdk/src/rp2350/boot_stage2/bs2_default.elf ld.lld: warning: cannot find entry symbol _start; not setting start address [84/84] Linking CXX executable project_name.elf ``` Similar, but quite not I guess.
armandomontanez commented 2024-08-13 10:43:23 -05:00 (Migrated from github.com)

-Wl,--entry=_stage2_boot in the link flags of boot_stage2 should fix this, that's what the Bazel build does.

`-Wl,--entry=_stage2_boot` in the link flags of boot_stage2 should fix this, that's what the Bazel build does.
peterharperuk commented 2024-08-13 10:56:05 -05:00 (Migrated from github.com)

Odd, I don't see this on Ubuntu 22.04

Odd, I don't see this on Ubuntu 22.04
matsobdev commented 2024-08-13 16:04:59 -05:00 (Migrated from github.com)

If I'm doing it right by adding it to CMakeLists.txt:

add_compile_options(
	-Wl,--entry=_stage2_boot
	)

or

cmake -G Ninja -S W:\pico2\pico2 -B W:\pico2\pico2\build -Wl,--entry=_stage2_boot

then it doesn't change a thing. 15.0.2 adds some extras (with or without above):

PICO_SDK_PATH is E:/Download/Pico_2/pico-sdk-2.0.0
Target board (PICO_BOARD) is 'pico2'.
Using board configuration from E:/Download/Pico_2/pico-sdk-2.0.0/src/boards/include/boards/pico2.h
Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'.
Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang'
Setting default C library to picolibc as LLVM appears to be using it
-- The C compiler identification is Clang 15.0.2
-- The CXX compiler identification is Clang 15.0.2
-- The ASM compiler identification is Clang
-- Found assembler: E:/Download/Pico_2/bin/clang.exe
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: E:/Download/Pico_2/bin/clang.exe - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: E:/Download/Pico_2/bin/clang++.exe - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
Build type is Release
-- Found Python3: C:/DEV/Python/python.exe (found version "3.8.10") found components: Interpreter
TinyUSB available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB.
BTstack available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/btstack
cyw43-driver available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/cyw43-driver
lwIP available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/lwip
mbedtls available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/mbedtls
-- Configuring done
-- Generating done
-- Build files have been written to: W:/pico2/pico2/build
[84/84] Linking CXX executable project_name.elf
ld.lld: warning: cannot find entry symbol _start; not setting start address

ld.lld: warning: section type mismatch for .ram_vector_table
>>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_runtime_init/runtime_init.c.obj:(.ram_vector_table): SHT_PROGBIT
S
>>> output section .ram_vector_table: SHT_NOBITS

ld.lld: warning: section type mismatch for .heap
>>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_crt0/crt0.S.obj:(.heap): SHT_PROGBITS
>>> output section .heap: SHT_NOBITS

ld.lld: warning: section type mismatch for .stack
>>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_crt0/crt0.S.obj:(.stack): SHT_PROGBITS
>>> output section .stack_dummy: SHT_NOBITS

PS. It was some SPI, DMA program, switched to just blink and same stuff.
PS2. 16.0.0 same like here, but 17.0.1 only like in first message.

If I'm doing it right by adding it to `CMakeLists.txt`: ``` add_compile_options( -Wl,--entry=_stage2_boot ) ``` or ``` cmake -G Ninja -S W:\pico2\pico2 -B W:\pico2\pico2\build -Wl,--entry=_stage2_boot ``` then it doesn't change a thing. 15.0.2 adds some extras (with or without above): ``` PICO_SDK_PATH is E:/Download/Pico_2/pico-sdk-2.0.0 Target board (PICO_BOARD) is 'pico2'. Using board configuration from E:/Download/Pico_2/pico-sdk-2.0.0/src/boards/include/boards/pico2.h Pico Platform (PICO_PLATFORM) is 'rp2350-arm-s'. Configuring toolchain based on PICO_COMPILER 'pico_arm_cortex_m33_clang' Setting default C library to picolibc as LLVM appears to be using it -- The C compiler identification is Clang 15.0.2 -- The CXX compiler identification is Clang 15.0.2 -- The ASM compiler identification is Clang -- Found assembler: E:/Download/Pico_2/bin/clang.exe -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: E:/Download/Pico_2/bin/clang.exe - skipped -- Detecting C compile features -- Detecting C compile features - done -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working CXX compiler: E:/Download/Pico_2/bin/clang++.exe - skipped -- Detecting CXX compile features -- Detecting CXX compile features - done Build type is Release -- Found Python3: C:/DEV/Python/python.exe (found version "3.8.10") found components: Interpreter TinyUSB available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/tinyusb/src/portable/raspberrypi/rp2040; enabling build support for USB. BTstack available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/btstack cyw43-driver available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/cyw43-driver lwIP available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/lwip mbedtls available at E:/Download/Pico_2/pico-sdk-2.0.0/lib/mbedtls -- Configuring done -- Generating done -- Build files have been written to: W:/pico2/pico2/build [84/84] Linking CXX executable project_name.elf ld.lld: warning: cannot find entry symbol _start; not setting start address ld.lld: warning: section type mismatch for .ram_vector_table >>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_runtime_init/runtime_init.c.obj:(.ram_vector_table): SHT_PROGBIT S >>> output section .ram_vector_table: SHT_NOBITS ld.lld: warning: section type mismatch for .heap >>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_crt0/crt0.S.obj:(.heap): SHT_PROGBITS >>> output section .heap: SHT_NOBITS ld.lld: warning: section type mismatch for .stack >>> CMakeFiles/project_name.dir/E_/Download/Pico_2/pico-sdk-2.0.0/src/rp2_common/pico_crt0/crt0.S.obj:(.stack): SHT_PROGBITS >>> output section .stack_dummy: SHT_NOBITS ``` PS. It was some SPI, DMA program, switched to just blink and same stuff. PS2. 16.0.0 same like here, but 17.0.1 only like in first message.
kilograham commented 2024-11-21 16:51:04 -06:00 (Migrated from github.com)

merged into develop

merged into develop
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