编译错误:undefined reference to `clock_gettime'

本文介绍了解决Linux环境下编译程序时出现的undefined referenceto `clock_gettime'错误的方法。只需在编译命令中添加-lrt参数,即可链接到所需的librt库。

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Linux下编译程序时,碰到了链接错误,提示为: undefined reference to `clock_gettime'。

解决方法记录如下:
编译时加上   -lrt  即可。
 -lrt 是加入librt链接库(在arm-linux-gnueabi/lib目录下)。没有这个库,编译的时候就会提示undefined reference to `clock_gettime错误。
/opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '5', this reader only handles version 2, 3 and 4 information. ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `gpiod_chip_open': core.c:(.text+0x60): undefined reference to `__lstat64_time64' core.c:(.text+0x82): undefined reference to `__stat64_time64' /opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '256', this reader only handles version 2, 3 and 4 information. core.c:(.text+0x1c6): undefined reference to `__ioctl_time64' ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `gpiod_line_update': core.c:(.text+0x2ea): undefined reference to `__ioctl_time64' ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `line_request_values': core.c:(.text+0x504): undefined reference to `__ioctl_time64' /opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '5', this reader only handles version 2, 3 and 4 information. ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `line_request_event_single': core.c:(.text+0x6e0): undefined reference to `__ioctl_time64' ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `gpiod_line_get_value_bulk': core.c:(.text+0x942): undefined reference to `__ioctl_time64' /opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '55303', this reader only handles version 2, 3 and 4 information. ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o):core.c:(.text+0x968): more undefined references to `__ioctl_time64' follow /opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '6656', this reader only handles version 2, 3 and 4 information. ./gpio/source/lib/libgpiod.a(libgpiod_la-core.o): In function `gpiod_line_event_wait_bulk': core.c:(.text+0xf30): undefined reference to `__ppoll64' /opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.5.0/../../../../arm-linux-gnueabihf/bin/ld: Dwarf Error: found dwarf version '5', this reader only handles version 2, 3 and 4 information. ./gpio/source/lib/libgpiod.a(libgpiod_la-helpers.o): In function `gpiod_chip_open_lookup': helpers.c:(.text+0x178): undefined reference to `__isoc23_strtoul' collect2: 错误: ld 返回 1 make: *** [Makefile:63:build/bin/demo] 错误 1 sed@sed-VMware-Virtual-Platform:~/gui/linux$
06-02
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