https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2016-02-08 CC| |hjl.tools at gmail dot com Ever confirmed|0 |1 --- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Václav Zeman from comment #0) > use.o:use.cxx:(.text$_ZTWN1N3ptdE[_ZTWN1N3ptdE]+0x15): relocation > truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init > function for N::ptd' > collect2: error: ld returned 1 exit status Cygwin doesn't use R_X86_64_PC32. Please show us the output of # g++ -v -shared -o cygtest.dll use.o def.o and # ld -V