enabling xblas is producing lost symbols in code

[malbajun]

Description
Enabling xblas with USE_XBLAS is producing lost symbols in code resulting in follow:

Verifying ELF objects in /usr/src/tmp/liblapack-buildroot (arch=normal,fhs=normal,lfs=relaxed,lint=relaxed,rpath=normal,stack=normal,textrel=normal,unresolved=normal)
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_zhemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_csymv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_dgemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_ssymv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_dgbmv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_chemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_cgbmv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_sgemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_zgbmv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_zsymv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_zgemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_cgemv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_sgbmv_x_64_
verify-elf: ERROR: ./usr/lib64/liblapack.so.3.12.0: undefined symbol: blas_dsymv_x_64_

These symbols are not published in libxlblas.so, so why?

** Reproduce **
Versions:

• lapack - 3.12.1
• xblas - 1.0.248

Configure with:
cmake -DCMAKE_POLICY_VERSION_MINIMUM=3.5 -DCMAKE_SKIP_INSTALL_RPATH:BOOL=yes '-DCMAKE_C_FLAGS:STRING=-pipe -frecord-gcc-switches -Wall -g -O2 -flto=auto -ffat-lto-objects -fPIC -DPIC' '-DCMAKE_CXX_FLAGS:STRING=-pipe -frecord-gcc-switches -Wall -g -O2 -flto=auto -ffat-lto-objects -fPIC -DPIC' '-DCMAKE_Fortran_FLAGS:STRING=-pipe -frecord-gcc-switches -Wall -g -O2 -flto=auto -ffat-lto-objects -fPIC -DPIC' -DCMAKE_INSTALL_PREFIX=/usr -DINCLUDE_INSTALL_DIR:PATH=/usr/include -DLIB_INSTALL_DIR:PATH=/usr/lib64 -DSYSCONF_INSTALL_DIR:PATH=/etc -DSHARE_INSTALL_PREFIX:PATH=/usr/share -DLIB_DESTINATION=lib64 -DLIB_SUFFIX=64 -S . -B x86_64-alt-linux -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_SHARED_LIBS:BOOL=ON -DLAPACKE:BOOL=ON -DCBLAS:BOOL=ON -DUSE_XBLAS:BOOL=ON
Build with:
cmake --build x86_64-alt-linux --verbose --parallel 40

Checklist

• I've included a minimal example to reproduce the issue
• I'd be willing to make a PR to solve this issue

[martin-frbg]

See your previous #1223 - the introduction of the automatic symbol suffixing with "64" for the combined INTERFACE64 build pushed some code past the traditional Fortran line length of 72 characters, so some symbols were truncated.
It is probably best to build a git checkout of the current master branch right now if you want XBLAS, as there have been multiple patches addressing this

[malbajun]

1. I saw that patch it didn't affect the result, which was as bad as above, after applying it
2. Yes than for advice to build from HEAD but I git some other errors during compilation procedure, so but am able to build the lib only without xblas