I’ve found a bug in the CMake (build file generation) process on Win64 targets,
which causes the redefinition of the CYGWIN_INSTALL_PATH variable partway
through the build file generation. This bug originally manifested when CMake
was unable to locate the SH_EXECUTABLE file in the C:\Cygwin64 directory.
“The bash executable (SH_EXECUTABLE-NOTFOUND) isn’t from Cygwin. Check your
path”
“wireshark could not find SH (missing: SH EXECUTABLE)"
The root cause is that CMake's stock FindPerl.cmake file is called containing
the following directive:
include(${CMAKE_CURRENT_LIST_DIR}/FindCygwin.cmake)
This points to the stock copy of FindCygwin.cmake instead of the modified
version (wireshark\cmake\modules\FindCygwin.cmake) included in the wireshark
source that adds the C:\Cygwin64 and WIRESHARK_CYGWIN_INSTALL_PATH search
paths. Thus when the FindPerl module is executed it redefines the existing
CYGWIN_INSTALL_PATH with an invalid search location, unless Cygwin has been
installed at C:\Cygwin. Neither C:\Cygwin64 or WIRESHARK_CYGWIN_INSTALL_PATH
will be checked. (These changes were added in commit 25ec91a on 2015-11-13, and
affects 2.0.0 and later versions )
The easiest fix is to simply add the stock copy the FindPerl.cmake file to the
wireshark\cmake\modules\ directory, which forces the correct version of the
FindCygwin.cmake to be used.
I’ve created a bug in the Wireshark bug tracker and am sending this e-mail to
the wireshark-dev e-mail list since it has greater prominence in google search
results and may be useful to anybody attempting to build Wireshark 2.0.0+ in a
Windows 64 bit environment.
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