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During an MSVC build on cygwin, the make program did not notice when the compiler or linker exited with an error. This was caused by the scripts exiting with the value returned by system() directly. On POSIX-like systems, such as cygwin, the return value of system() has the exit code of the executed command encoded in the first byte (ie the value is shifted up by 8 bits). This allows the bottom 7 bits to contain the signal number of a terminated process, while the eighth bit indicates whether a core-dump was produced. (A value of -1 indicates that the command failed to execute.) The make program, however, expects the exit code to be encoded in the bottom byte. Futhermore, it apparently masks off and ignores anything in the upper bytes. However, these scripts are (naturally) intended to be used on the windows platform, where we can not assume POSIX-like semantics from a perl implementation (eg ActiveState). So, in general, we can not assume that shifting the return value right by eight will get us the exit code. In order to improve portability, we assume that a zero return from system() indicates success, whereas anything else indicates failure. Since we don't need to know the exact exit code from the compiler or linker, we simply exit with 0 (success) or 1 (failure). Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The Steps of Build Git with VS2008
1. You need the build environment, which contains the Git dependencies
to be able to compile, link and run Git with MSVC.
You can either use the binary repository:
WWW: http://repo.or.cz/w/msvcgit.git
Git: git clone git://repo.or.cz/msvcgit.git
Zip: http://repo.or.cz/w/msvcgit.git?a=snapshot;h=master;sf=zip
and call the setup_32bit_env.cmd batch script before compiling Git,
(see repo/package README for details), or the source repository:
WWW: http://repo.or.cz/w/gitbuild.git
Git: git clone git://repo.or.cz/gitbuild.git
Zip: (None, as it's a project with submodules)
and build the support libs as instructed in that repo/package.
2. Ensure you have the msysgit environment in your path, so you have
GNU Make, bash and perl available.
WWW: http://repo.or.cz/w/msysgit.git
Git: git clone git://repo.or.cz/msysgit.git
Zip: http://repo.or.cz/w/msysgit.git?a=snapshot;h=master;sf=zip
This environment is also needed when you use the resulting
executables, since Git might need to run scripts which are part of
the git operations.
3. Inside Git's directory run the command:
make common-cmds.h
to generate the common-cmds.h file needed to compile git.
4. Then either build Git with the GNU Make Makefile in the Git projects
root
make MSVC=1
or generate Visual Studio solution/projects (.sln/.vcproj) with the
command
perl contrib/buildsystems/generate -g Vcproj
and open and build the solution with the IDE
devenv git.sln /useenv
or build with the IDE build engine directly from the command line
devenv git.sln /useenv /build "Release|Win32"
The /useenv option is required, so Visual Studio picks up the
environment variables for the support libraries required to build
Git, which you set up in step 1.
Done!