Description of problem: dlib depends on libopenblas at build time, but the pkgconfig file that gets installed with dlib-devel doesn't specify the library in the library flags. Linking an application against dlib and using the ldflags returned by pkgconfig will result in undefined references: <removed>.cc.o: In function `dlib::lapack::binding::gesdd(char, int, int, double*, int, double*, double*, int, double*, int, double*, int, int*)': /usr/include/dlib/matrix/lapack/gesdd.h:38: undefined reference to `dgesdd_' <removed>.cc.o: In function `dlib::lapack::binding::gesvd(char, char, int, int, double*, int, double*, double*, int, double*, int, double*, int)': /usr/include/dlib/matrix/lapack/gesvd.h:38: undefined reference to `dgesvd_' <removed>.cc.o: In function `dlib::blas_bindings::cblas_axpy(int, float, float const*, int, float*, int)': /usr/include/dlib/matrix/matrix_blas_bindings.h:146: undefined reference to `cblas_saxpy' <removed>.cc.o: In function `dlib::blas_bindings::cblas_scal(int, float, float*)': /usr/include/dlib/matrix/matrix_blas_bindings.h:175: undefined reference to `cblas_sscal' <removed>.cc.o: In function `dlib::blas_bindings::cblas_gemm(dlib::blas_bindings::CBLAS_ORDER, dlib::blas_bindings::CBLAS_TRANSPOSE, dlib::blas_bindings::CBLAS_TRANSPOSE, int, int, int, double, double const*, int, double const*, int, double, double*, int)': /usr/include/dlib/matrix/matrix_blas_bindings.h:216: undefined reference to `cblas_dgemm' Version-Release number of selected component (if applicable): 19.4 How reproducible: Always Steps to Reproduce: 1. Write an application that includes and uses dlib face detection 2. Build application using 'c++ app.cc -Wall -O0 -g3 `pkg-config --flags`' Actual results: The above mentioned undefined references. Expected results: Successful linking. Additional information: [cwiiis@cwiiis-razer lib64]$ readelf -a libdlib.so|grep -i needed 0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0] 0x0000000000000001 (NEEDED) Shared library: [libnsl.so.1] 0x0000000000000001 (NEEDED) Shared library: [libX11.so.6] 0x0000000000000001 (NEEDED) Shared library: [libpng16.so.16] 0x0000000000000001 (NEEDED) Shared library: [libjpeg.so.62] 0x0000000000000001 (NEEDED) Shared library: [libopenblas.so.0] 0x0000000000000001 (NEEDED) Shared library: [libsqlite3.so.0] 0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] [cwiiis@cwiiis-razer lib64]$ pkg-config --modversion dlib-1 19.4.0 [cwiiis@cwiiis-razer lib64]$ pkg-config --libs dlib-1 -L/usr/usr/lib64 -ldlib -lpng16 -lz
Normally you don't need to explicitly specify all recursively required shared libraries. Can you provide a code example to reproduce this issue? > 2. Build application using 'c++ app.cc -Wall -O0 -g3 `pkg-config --flags`' pkg-config command has no option '--flags'.
Created attachment 1369486 [details] Minimal test-acse
Sorry, hit return by accident and that submits the form... Attachment #1369486 [details] is a minimal application that exposes the error in dlib's pkg-config. Build it with: c++ dlib-pkgconfig-error.cc -Wall -O0 -g3 `pkg-config --cflags --libs dlib-1` Error output: /usr/bin/ld: /tmp/ccF9CxzX.o: undefined reference to symbol 'dgesvd_' //usr/lib64/libopenblas.so.0: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status
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