/usr/bin/ld: bnll.cpp:(.text+0xed): undefined reference to `__logf_finite'

[lvxiaojie111]

hello, when i use your command to complie，have some issues
when " cmake .. " no errors
when "mkae " have error as follow:
make install
Scanning dependencies of target mlpr
[ 6%] Building CXX object src/CMakeFiles/mlpr.dir/base.cpp.o
[ 13%] Building CXX object src/CMakeFiles/mlpr.dir/lpc_recognizer.cpp.o
[ 20%] Building CXX object src/CMakeFiles/mlpr.dir/lpr_recognizer.cpp.o
[ 26%] Building CXX object src/CMakeFiles/mlpr.dir/detector/mtcnn_align.cpp.o
[ 33%] Building CXX object src/CMakeFiles/mlpr.dir/detector/mtcnn_proposal.cpp.o
[ 40%] Building CXX object src/CMakeFiles/mlpr.dir/detector/mtcnn_base.cpp.o
[ 46%] Building CXX object src/CMakeFiles/mlpr.dir/detector/mtcnn_plate_detector.cpp.o
[ 53%] Building CXX object src/CMakeFiles/mlpr.dir/detector/ssd_plate_detector.cpp.o
[ 60%] Building CXX object src/CMakeFiles/mlpr.dir/detector/lffd.cpp.o
[ 66%] Building CXX object src/CMakeFiles/mlpr.dir/detector/lffd_plate_detector.cpp.o
[ 73%] Building CXX object src/CMakeFiles/mlpr.dir/detector/align_plate_detector.cpp.o
[ 80%] Building CXX object src/CMakeFiles/mlpr.dir/plate_petector.cpp.o
[ 86%] Linking CXX static library libmlpr.a
[ 86%] Built target mlpr
Scanning dependencies of target run_plate
[ 93%] Building CXX object example/CMakeFiles/run_plate.dir/main.cpp.o
[100%] Linking CXX executable run_plate
/usr/bin/ld: /home/ljj/Downloads/mobile-lpr-master/deps/ncnn/lib/libncnn.a(bnll.cpp.o): in function ncnn::BNLL::forward_inplace(ncnn::Mat&, ncnn::Option const&) const [clone ._omp_fn.0]': bnll.cpp:(.text+0xe0): undefined reference to __expf_finite'
/usr/bin/ld: bnll.cpp:(.text+0xed): undefined reference to __logf_finite' /usr/bin/ld: bnll.cpp:(.text+0x101): undefined reference to __expf_finite'
/usr/bin/ld: bnll.cpp:(.text+0x10e): undefined reference to __logf_finite' /usr/bin/ld: /home/ljj/Downloads/mobile-lpr-master/deps/ncnn/lib/libncnn.a(convolution.cpp.o): in function ncnn::Convolution::forward(ncnn::Mat const&, ncnn::Mat&, ncnn::Option const&) const [clone ._omp_fn.2]':
convolution.cpp:(.text+0x434): undefined reference to __expf_finite' /usr/bin/ld: /home/ljj/Downloads/mobile-lpr-master/deps/ncnn/lib/libncnn.a(deconvolution.cpp.o): in function ncnn::Deconvolution::forward(ncnn::Mat const&, ncnn::Mat&, ncnn::Option const&) const [clone ._omp_fn.0]':
deconvolution.cpp:(.text+0x492): undefined reference to `__expf_finite'
how to solve it ??????
i search internet,some says use libm.so ,but not solve.
my platform is : ubuntu 20.04, gcc9.3 .
hope to solve it.

[victorming666]

downgrade your gcc to 7.5.0, and re-compile ncnn. It'll be ok.

[lvxiaojie111]

您的邮件已经收到。谢谢！                                          吕

[zmwtal]

同样的问题，按上面说的降低gcc到7.5.0版本，为什么 重新make install 还是报错，还是同样的问题

[lvxiaojie111]

您的邮件已经收到。谢谢！                                          吕

[zmwtal]

@victorming666

同样的问题，按上面说的降低gcc到7.5.0版本，为什么 重新make install 还是报错，还是同样的问题