Package: src:sagemath Version: 8.6-2 Severity: important Tags: sid buster sagemath ftbfs with ld --as-needed as the default
the build log shows in various locations: [...] [sagelib-8.6] g++ -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fdebug-prefix-map=/build/python2.7-bqwtKO/python2.7-2.7.15=. -fstack-protector-strong -Wformat -Werror=format-security -L/<<PKGBUILDDIR>>/debian/build/usr/lib -Wl,-rpath,/usr/lib/x86_64-linux-gnu/gap -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 build/temp.linux-x86_64-2.7/build/cythonized/sage/matrix/matrix_modn_sparse.o -L/<<PKGBUILDDIR>>/debian/build/usr/lib -L/usr/lib/x86_64-linux-gnu/gap -llinbox-1.5.2 -llinboxsage-1.5.2 -lntl -liml -lblas -llapack -lgivaro -lflint -lmpfr -lgmp -lgmpxx -lstdc++ -o build/lib.linux-x86_64-2.7/sage/matrix/matrix_modn_sparse.so -lpari [...] the object file appears *after* the libraries on the command line, so nothing is linked. I didn't grok sage/setup.py where exactly that occurs, but you always should place the libraries after the object files on the command line. You can test that by setting export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed Please forward that upstream.
