Hi, as my windows pypy would always crash on my project but the same project on linux works fine and my main developing environment is windows I decided to try cygwin pypy so I got pypy2-v5.7.0-src.tar.bz2 and run on latest Cygwin-32 on windows 10/64 python ../../rpython/bin/rpython -Ojit targetpypystandalone aside of few warnings like /tmp/usession-release-pypy2.7-v5.7.0-0/platcheck_50.c:92:1: warning: implicit declaration of function ‘mremap’ [-Wimplicit-function-declaration] /tmp/usession-release-pypy2.7-v5.7.0-0/module_cache/module_0.c:82:68: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] which seems indicate - that some flags are not correctly set I almost immediately get following error: === [platform:execute] gcc -shared /tmp/usession-release-pypy2.7-v5.7.0-0/module_cache/module_0.o /tmp/usession-release-pypy2.7-v5.7.0-0/module_cache/module_1.o /tmp/usession-release-pypy2.7-v5.7.0-0/module_cache/module_2.o -Wl,--export-all-symbols -lrt -o /tmp/usession-release-pypy2.7-v5.7.0-0/shared_cache/externmod.dll Traceback (most recent call last): File "../../rpython/bin/rpython", line 20, in <module> main() File "/home/Sergey/pypy2/rpython/translator/goal/translate.py", line 217, in main targetspec_dic, translateconfig, config, args = parse_options_and_load_target() File "/home/Sergey/pypy2/rpython/translator/goal/translate.py", line 155, in parse_options_and_load_target targetspec_dic = load_target(targetspec) File "/home/Sergey/pypy2/rpython/translator/goal/translate.py", line 97, in load_target mod = __import__(specname) File "targetpypystandalone.py", line 11, in <module> from pypy.tool.option import make_objspace File "/home/Sergey/pypy2/pypy/tool/option.py", line 3, in <module> from pypy.config.pypyoption import get_pypy_config File "/home/Sergey/pypy2/pypy/config/pypyoption.py", line 44, in <module> if detect_cpu.autodetect().startswith('x86'): File "/home/Sergey/pypy2/rpython/jit/backend/detect_cpu.py", line 106, in autodetect return detect_model_from_host_platform() File "/home/Sergey/pypy2/rpython/jit/backend/detect_cpu.py", line 85, in detect_model_from_host_platform if feature.detect_sse2(): File "/home/Sergey/pypy2/rpython/jit/backend/x86/detect_feature.py", line 20, in detect_sse2 code = cpu_id(eax=1) File "/home/Sergey/pypy2/rpython/jit/backend/x86/detect_feature.py", line 34, in cpu_id return cpu_info(''.join(asm)) File "/home/Sergey/pypy2/rpython/jit/backend/x86/detect_feature.py", line 16, in cpu_info free(data, 4096) File "/home/Sergey/pypy2/rpython/rtyper/lltypesystem/rffi.py", line 260, in wrapper assert len(args) == nb_args AssertionError ==== any guide for building latest pypy on Cygwin? or at least to fix those mentioned errors? Regards Sergey