Linking error when using `rand::thread_rng()`
arnauorriols opened this issue · 4 comments
arnauorriols commented
I'm using this example as boilerplate for a PoC I'm conducting. I'm compiling with the docker image georgikrocks/esp-idf-rust:latest (2e95100a412d). When my Rust code calls rand::thread_rng(), compilation fails with
FAILED: streams-embedded-transport-example.elf
: && /opt/xtensa-esp32-elf-clang/bin/xtensa-esp32-elf-g++ -mlongcalls -Wno-frame-address CMakeFiles/streams-embedded-transport-example.elf.dir/project_elf_src_esp32.c.obj -o streams-embedded-transport-example.elf esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/asio/libasio.a esp-idf/cbor/libcbor.a esp-idf/unity/libunity.a esp-idf/cmock/libcmock.a esp-idf/coap/libcoap.a esp-idf/console/libconsole.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/esp_adc_cal/libesp_adc_cal.a esp-idf/esp_hid/libesp_hid.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/esp_lcd/libesp_lcd.a esp-idf/protobuf-c/libprotobuf-c.a esp-idf/protocomm/libprotocomm.a esp-idf/mdns/libmdns.a esp-idf/esp_local_ctrl/libesp_local_ctrl.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/esp_websocket_client/libesp_websocket_client.a esp-idf/expat/libexpat.a esp-idf/wear_levelling/libwear_levelling.a esp-idf/fatfs/libfatfs.a esp-idf/freemodbus/libfreemodbus.a esp-idf/jsmn/libjsmn.a esp-idf/json/libjson.a esp-idf/libsodium/liblibsodium.a esp-idf/mqtt/libmqtt.a esp-idf/openssl/libopenssl.a esp-idf/perfmon/libperfmon.a esp-idf/spiffs/libspiffs.a esp-idf/ulp/libulp.a esp-idf/wifi_provisioning/libwifi_provisioning.a esp-idf/main/libmain.a esp-idf/clib/libclib.a esp-idf/rustlib/librustlib.a -Wl,--cref -Wl,--Map=/opt/streams/build/streams-embedded-transport-example.map -Wl,--gc-sections -fno-rtti -fno-lto esp-idf/asio/libasio.a esp-idf/cbor/libcbor.a esp-idf/cmock/libcmock.a esp-idf/unity/libunity.a esp-idf/coap/libcoap.a esp-idf/esp_adc_cal/libesp_adc_cal.a esp-idf/esp_hid/libesp_hid.a esp-idf/esp_lcd/libesp_lcd.a esp-idf/esp_local_ctrl/libesp_local_ctrl.a esp-idf/esp_websocket_client/libesp_websocket_client.a esp-idf/expat/libexpat.a esp-idf/fatfs/libfatfs.a esp-idf/wear_levelling/libwear_levelling.a esp-idf/freemodbus/libfreemodbus.a esp-idf/jsmn/libjsmn.a esp-idf/libsodium/liblibsodium.a esp-idf/mqtt/libmqtt.a esp-idf/openssl/libopenssl.a esp-idf/perfmon/libperfmon.a esp-idf/spiffs/libspiffs.a esp-idf/wifi_provisioning/libwifi_provisioning.a esp-idf/protocomm/libprotocomm.a esp-idf/protobuf-c/libprotobuf-c.a esp-idf/mdns/libmdns.a esp-idf/console/libconsole.a esp-idf/json/libjson.a esp-idf/rustlib/target/xtensa-esp32-espidf/release/librustlib.a esp-idf/clib/libclib.a esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/ulp/libulp.a esp-idf/mbedtls/mbedtls/library/libmbedtls.a esp-idf/mbedtls/mbedtls/library/libmbedcrypto.a esp-idf/mbedtls/mbedtls/library/libmbedx509.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcoexist.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcore.a /opt/esp/idf/components/esp_wifi/lib/esp32/libespnow.a /opt/esp/idf/components/esp_wifi/lib/esp32/libmesh.a /opt/esp/idf/components/esp_wifi/lib/esp32/libnet80211.a /opt/esp/idf/components/esp_wifi/lib/esp32/libpp.a /opt/esp/idf/components/esp_wifi/lib/esp32/libsmartconfig.a /opt/esp/idf/components/esp_wifi/lib/esp32/libwapi.a esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/ulp/libulp.a esp-idf/mbedtls/mbedtls/library/libmbedtls.a esp-idf/mbedtls/mbedtls/library/libmbedcrypto.a esp-idf/mbedtls/mbedtls/library/libmbedx509.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcoexist.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcore.a /opt/esp/idf/components/esp_wifi/lib/esp32/libespnow.a /opt/esp/idf/components/esp_wifi/lib/esp32/libmesh.a /opt/esp/idf/components/esp_wifi/lib/esp32/libnet80211.a /opt/esp/idf/components/esp_wifi/lib/esp32/libpp.a /opt/esp/idf/components/esp_wifi/lib/esp32/libsmartconfig.a /opt/esp/idf/components/esp_wifi/lib/esp32/libwapi.a esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/ulp/libulp.a esp-idf/mbedtls/mbedtls/library/libmbedtls.a esp-idf/mbedtls/mbedtls/library/libmbedcrypto.a esp-idf/mbedtls/mbedtls/library/libmbedx509.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcoexist.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcore.a /opt/esp/idf/components/esp_wifi/lib/esp32/libespnow.a /opt/esp/idf/components/esp_wifi/lib/esp32/libmesh.a /opt/esp/idf/components/esp_wifi/lib/esp32/libnet80211.a /opt/esp/idf/components/esp_wifi/lib/esp32/libpp.a /opt/esp/idf/components/esp_wifi/lib/esp32/libsmartconfig.a /opt/esp/idf/components/esp_wifi/lib/esp32/libwapi.a esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/ulp/libulp.a esp-idf/mbedtls/mbedtls/library/libmbedtls.a esp-idf/mbedtls/mbedtls/library/libmbedcrypto.a esp-idf/mbedtls/mbedtls/library/libmbedx509.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcoexist.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcore.a /opt/esp/idf/components/esp_wifi/lib/esp32/libespnow.a /opt/esp/idf/components/esp_wifi/lib/esp32/libmesh.a /opt/esp/idf/components/esp_wifi/lib/esp32/libnet80211.a /opt/esp/idf/components/esp_wifi/lib/esp32/libpp.a /opt/esp/idf/components/esp_wifi/lib/esp32/libsmartconfig.a /opt/esp/idf/components/esp_wifi/lib/esp32/libwapi.a esp-idf/esp_ringbuf/libesp_ringbuf.a esp-idf/efuse/libefuse.a esp-idf/esp_ipc/libesp_ipc.a esp-idf/driver/libdriver.a esp-idf/esp_pm/libesp_pm.a esp-idf/mbedtls/libmbedtls.a esp-idf/app_update/libapp_update.a esp-idf/bootloader_support/libbootloader_support.a esp-idf/spi_flash/libspi_flash.a esp-idf/nvs_flash/libnvs_flash.a esp-idf/pthread/libpthread.a esp-idf/esp_gdbstub/libesp_gdbstub.a esp-idf/espcoredump/libespcoredump.a esp-idf/esp_phy/libesp_phy.a esp-idf/esp_system/libesp_system.a esp-idf/esp_rom/libesp_rom.a esp-idf/hal/libhal.a esp-idf/vfs/libvfs.a esp-idf/esp_eth/libesp_eth.a esp-idf/tcpip_adapter/libtcpip_adapter.a esp-idf/esp_netif/libesp_netif.a esp-idf/esp_event/libesp_event.a esp-idf/wpa_supplicant/libwpa_supplicant.a esp-idf/esp_wifi/libesp_wifi.a esp-idf/lwip/liblwip.a esp-idf/log/liblog.a esp-idf/heap/libheap.a esp-idf/soc/libsoc.a esp-idf/esp_hw_support/libesp_hw_support.a esp-idf/xtensa/libxtensa.a esp-idf/esp_common/libesp_common.a esp-idf/esp_timer/libesp_timer.a esp-idf/freertos/libfreertos.a esp-idf/newlib/libnewlib.a esp-idf/cxx/libcxx.a esp-idf/app_trace/libapp_trace.a esp-idf/nghttp/libnghttp.a esp-idf/esp-tls/libesp-tls.a esp-idf/tcp_transport/libtcp_transport.a esp-idf/esp_http_client/libesp_http_client.a esp-idf/esp_http_server/libesp_http_server.a esp-idf/esp_https_ota/libesp_https_ota.a esp-idf/sdmmc/libsdmmc.a esp-idf/esp_serial_slave_link/libesp_serial_slave_link.a esp-idf/ulp/libulp.a esp-idf/mbedtls/mbedtls/library/libmbedtls.a esp-idf/mbedtls/mbedtls/library/libmbedcrypto.a esp-idf/mbedtls/mbedtls/library/libmbedx509.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcoexist.a /opt/esp/idf/components/esp_wifi/lib/esp32/libcore.a /opt/esp/idf/components/esp_wifi/lib/esp32/libespnow.a /opt/esp/idf/components/esp_wifi/lib/esp32/libmesh.a /opt/esp/idf/components/esp_wifi/lib/esp32/libnet80211.a /opt/esp/idf/components/esp_wifi/lib/esp32/libpp.a /opt/esp/idf/components/esp_wifi/lib/esp32/libsmartconfig.a /opt/esp/idf/components/esp_wifi/lib/esp32/libwapi.a -Wl,--wrap=mbedtls_mpi_exp_mod -u esp_app_desc -u pthread_include_pthread_impl -u pthread_include_pthread_cond_impl -u pthread_include_pthread_local_storage_impl -L /opt/esp/idf/components/esp_phy/lib/esp32 -lphy esp-idf/esp_phy/libesp_phy.a -lphy esp-idf/esp_phy/libesp_phy.a -lphy -lrtc -u ld_include_highint_hdl -u start_app -u start_app_other_cores -L /opt/streams/build/esp-idf/esp_system/ld -T memory.ld -T sections.ld -u __ubsan_include -L /opt/esp/idf/components/esp_rom/esp32/ld -T esp32.rom.ld -T esp32.rom.api.ld -T esp32.rom.libgcc.ld -T esp32.rom.newlib-data.ld -T esp32.rom.syscalls.ld -T esp32.rom.newlib-funcs.ld -T esp32.rom.newlib-time.ld -Wl,--wrap=longjmp -u __assert_func -u vfs_include_syscalls_impl -L /opt/esp/idf/components/esp_wifi/lib/esp32 -L /opt/esp/idf/components/soc/esp32/ld -T esp32.peripherals.ld /opt/esp/idf/components/xtensa/esp32/libxt_hal.a -Wl,--undefined=uxTopUsedPriority -u app_main -lm esp-idf/newlib/libnewlib.a -u newlib_include_heap_impl -u newlib_include_syscalls_impl -u newlib_include_pthread_impl -Wl,--wrap=_Unwind_SetEnableExceptionFdeSorting -Wl,--wrap=__register_frame_info_bases -Wl,--wrap=__register_frame_info -Wl,--wrap=__register_frame -Wl,--wrap=__register_frame_info_table_bases -Wl,--wrap=__register_frame_info_table -Wl,--wrap=__register_frame_table -Wl,--wrap=__deregister_frame_info_bases -Wl,--wrap=__deregister_frame_info -Wl,--wrap=_Unwind_Find_FDE -Wl,--wrap=_Unwind_GetGR -Wl,--wrap=_Unwind_GetCFA -Wl,--wrap=_Unwind_GetIP -Wl,--wrap=_Unwind_GetIPInfo -Wl,--wrap=_Unwind_GetRegionStart -Wl,--wrap=_Unwind_GetDataRelBase -Wl,--wrap=_Unwind_GetTextRelBase -Wl,--wrap=_Unwind_SetIP -Wl,--wrap=_Unwind_SetGR -Wl,--wrap=_Unwind_GetLanguageSpecificData -Wl,--wrap=_Unwind_FindEnclosingFunction -Wl,--wrap=_Unwind_Resume -Wl,--wrap=_Unwind_RaiseException -Wl,--wrap=_Unwind_DeleteException -Wl,--wrap=_Unwind_ForcedUnwind -Wl,--wrap=_Unwind_Resume_or_Rethrow -Wl,--wrap=_Unwind_Backtrace -Wl,--wrap=__cxa_call_unexpected -Wl,--wrap=__gxx_personality_v0 -u __cxa_guard_dummy -lstdc++ esp-idf/pthread/libpthread.a -lgcc esp-idf/cxx/libcxx.a -u __cxx_fatal_exception esp-idf/app_trace/libapp_trace.a -lgcov esp-idf/app_trace/libapp_trace.a -lgcov -lc && :
/opt/xtensa-esp32-elf-clang/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: esp-idf/rustlib/target/xtensa-esp32-espidf/release/librustlib.a(rustlib-8ed1900ea86a6c48.rand-4de7581c8c2fb914.rand.5x8vszn4-cgu.15.rcgu.o.rcgu.o):(.literal._ZN3std4sync4once4Once9call_once28_$u7b$$u7b$closure$u7d$$u7d$17hd74d63aeb634a063E.llvm.12770143606975383821+0x4): undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
ninja failed with exit code 1
I noticed ESP-IDF pthread.c implementation does not implement pthread_atfork. Am I right in assuming there's nothing I can do ATM? Is it a bug, pending implementation, or can't be implemented?
In any case, this should probably be caught at compile time rather than link time. If you could point me to the right repository to where report this issue I'd appreciated it.
georgik commented
@arnauorriols thank you fore reporting the issue.
Our team made initial analysis with following result:
pthread_atfork as indeed not implemented in IDF. Since IDF can't implement fork. At to why this is a linker error not compiler error, I think the answer is the function is declared somewhere in lib, and we haven't made it unavailable for newlib/idf.
Some pointers to source code:
pthread_atfork declared here: https://github.com/rust-lang/libc/blob/ca93b20b8435d238ceeb75fd09eaddee133c4147/src/unix/newlib/mod.rs#L692-L696
igrr commented
Thanks for reporting this @arnauorriols!
I've looked into this for a bit, so leaving a couple links that may be useful.
pthread_atfork is declared here in libc crate: https://github.com/rust-lang/libc/blob/ca93b20b8435d238ceeb75fd09eaddee133c4147/src/unix/newlib/mod.rs#L692-L696
and called here in rand crate: https://github.com/rust-random/rand/blob/6d236fd8efddc063d1312de00792ba100fe083de/src/rngs/adapter/reseeding.rs#L282-L317.
I think meaningful implementation of pthread_fork is not possible in IDF, since IDF cannot implement fork. However since fork never happens, we can either implement a dummy pthread_atfork in ESP-IDF (do nothing, return 0). Alternatively, we can make the declaration of pthread_atfork (and other process-related functions) conditional on #[cfg(not(target_os = "espidf"))], then submit a PR to rand crate to handle target_os = "espidf" same way as at handles target_os = "emscripten".
As to your comment that this should be a compile time rather than link time error — I think while being correct this would put us further away from reaching the desired state where everything works as expected. To make all such situations compile time errors, we would need to get a real list of posix/unix APIs implemented in ESP-IDF, and exclude everything that's not implemented in libc crate. Then, realize that half of them actually can be implemented or stubbed out, make the changes in IDF, and then un-exclude them in libc. The latter will probably take more time. I think once we do the initial pass of implementing the missing things in IDF, we can look at the list of functions declared in libc and compare it to the list of functions extern'ed by IDF. Then, exclude the missing ones in libc crate. But doing this at the current point is premature, in my opinion.
(sorry, have crossed posts with @georgik!)
georgik commented
@igrr Is this issue still relevant with 1.55 and installation instructions from https://github.com/esp-rs/rust-build project?
arnauorriols commented