[boost] gcc.archive fails under Windows/Cygwin

Subject: [boost] gcc.archive fails under Windows/Cygwin
From: Peter Dimov (lists_at_[hidden])
Date: 2015-01-05 11:26:47

Fails like this:

gcc.archive 
..\..\..\bin.v2\libs\system\build\gcc-4.8.3\release\link-static\libboost_system-gcc48-1_58.a
The system cannot find the path specified.
The system cannot find the path specified.

    "/usr/i686-pc-cygwin/bin/ar.exe"  rc 
"..\..\..\bin.v2\libs\system\build\gcc-4.8.3\release\link-static\libboost_system-gcc48-1_58.a" 
"..\..\..\bin.v2\libs\system\build\gcc-4.8.3\release\link-static\error_code.o"
    "/usr/i686-pc-cygwin/bin/ranlib.exe" 
"..\..\..\bin.v2\libs\system\build\gcc-4.8.3\release\link-static\libboost_system-gcc48-1_58.a"

...failed gcc.archive 
..\..\..\bin.v2\libs\system\build\gcc-4.8.3\release\link-static\libboost_system-gcc48-1_58.a...