Created attachment 496998 [details] postgis-build.log It looks like Postgis can't be linked with the Gold linker. I ran into the following build failure while testing Github PR #5722. $ sudo binutils-config --linker ld.gold $ sudo USE="-gtk" emerge -pv1 postgis These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] dev-db/postgis-2.1.8-r1::gentoo USE="-doc -gtk -static-libs {-test}" 0 KiB Eventually the build fails with, libtool: link: x86_64-pc-linux-gnu-gcc -I ../liblwgeom -march=native -O2 -pipe -fPIC -DPIC -Wall -Wmissing-prototypes shpopen.o dbfopen.o getopt.o shpcommon.o safileio.o shp2pgsql-core.o shp2pgsql-cli.o -o .libs/shp2pgsql -Wl,-O1 -Wl,-rpath -Wl,/usr/lib64/postgresql-9.4/lib64 -Wl,--enable-new-dtags ../liblwgeom/.libs/liblwgeom.so -L/usr/lib64 -lgeos_c -lproj -ljson-c -L/usr/lib64/postgresql-9.4/lib64 -Wl,--as-needed -lc ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'sqrt' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'atan' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'floor' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'atan2' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'sincos' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'remainder' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'acos' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'asin' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'sin' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'cos' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'log10' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'log' ../liblwgeom/.libs/liblwgeom.so: error: undefined reference to 'tan' collect2: error: ld returned 1 exit status make[1]: *** [Makefile:103: shp2pgsql] Error 1 make[1]: Leaving directory '/var/tmp/portage/dev-db/postgis-2.1.8-r1/work /postgis-2.1.8/loader' Switching back to the BFD linker, $ sudo binutils-config --linker ld.bfd works around the issue. The problem is that one or more pieces of Postgis are underlinked: they make use of functions in a library that isn't explicitly mentioned in the linker command. For example, adding "-lm" to the linker command above (to link against the math library) makes it succeed.
This was fixed upstream in their VCS and will trickle down into the releases eventually.
