我正在创建一个在树莓派上使用v4l的小型python应用程序。经过几个小时的故障排除后,我即将安装它。我只需编译官方V4L2驱动程序。
我正在关注本教程https://www.ics.com/blog/raspberry-pi-camera-module#.VAaCHqM0_YQ
当我进入make步骤时,我收到此错误:undefined reference to symbol 'clock_gettime'
Google搜索告诉我,我需要“将-lrt添加到您链接到的库列表”,或者将其放在makefile中。我对make和configure一无所知。我试着读一点,但我这样做是为了上班,没有时间去上课。我不知道该怎么办......请帮忙...
我还应该提一下,我只是不知道我是否更改了makefile或makefile.in或configure?我试图将"-lrt"
放在makefile中,但它很复杂,并且弄清楚要放在哪里。
以下是实际错误:
Making all in v4l2-compliance
make[3]: Entering directory '/home/pi/v4l-utils/utils/v4l2-compliance'
CXXLD v4l2-compliance
/usr/bin/ld: v4l2-test-buffers.o: undefined reference to symbol 'clock_gettime@@
GLIBC_2.4'
//lib/arm-linux-gnueabihf/librt.so.1: error adding symbols: DSO missing from com
mand line
collect2: ld returned 1 exit status
Makefile:388: recipe for target 'v4l2-compliance' failed
make[3]: *** [v4l2-compliance] Error 1
make[3]: Leaving directory '/home/pi/v4l-utils/utils/v4l2-compliance'
Makefile:347: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/pi/v4l-utils/utils'
Makefile:386: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/pi/v4l-utils'
Makefile:315: recipe for target 'all' failed
make: *** [all] Error 2
我尝试编辑Makefile并找到一个读取“LIBS =”并将其更改为“LIBS = -lrt”,这不起作用。
我在Makefile中找到了第388行,这是它在该区域中读取的内容:
# This directory's subdirectories are mostly independent; you can cd
# into them and run `make' without going through this Makefile.
# To change the values of `make' variables: instead of editing Makefiles,
# (1) if the variable is set in `config.status', edit `config.status'
# (which will cause the Makefiles to be regenerated when you run `make');
# (2) otherwise, pass the desired values on the `make' command line.
$(RECURSIVE_TARGETS):
@fail= failcom='exit 1'; \
for f in x $$MAKEFLAGS; do \
case $$f in \
*=* | --[!k]*);; \
*k*) failcom='fail=yes';; \
esac; \
done; \
dot_seen=no; \
target=`echo $@ | sed s/-recursive//`; \
list='$(SUBDIRS)'; for subdir in $$list; do \
echo "Making $$target in $$subdir"; \
if test "$$subdir" = "."; then \
dot_seen=yes; \
local_target="$$target-am"; \
else \
local_target="$$target"; \
fi; \
($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
|| eval $$failcom; \
done; \
if test "$$dot_seen" = "no"; then \
$(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
fi; test -z "$$fail"
所以我试着像这样运行make:make CFLAGS =' - lrt',那没有做任何事情。 我查看了config.status,这是另一个令人困惑的文件。
答案 0 :(得分:2)
我付了一名顾问,他告诉我要换两个不同的文件。
第一档:
/v4l-utils/utils/v4l2-compliance/Makefile
第二档:
/v4l-utils/utils/v4l2-ctl/Makefile
将“LDFLAGS =”更改为“LDFLAGS = -lrt”
之后,V4l2在Raspberry Pi上编译得很好。
答案 1 :(得分:2)
这也适用: -
LDFLAGS=-lrt ./configure
make