The workdir iterator has always tried to ignore .git files, but
it turns out there were some bugs. This makes it more robust at
ignoring .git files.
This also makes iterators always check ".git" case insensitively
regardless of the properties of the system. This will make libgit2
skip ".GIT" and the like. This is different from core git, but on
systems with case insensitive but case preserving file systems,
allowing ".GIT" to be added is problematic.
This checks for a leading '.' before looking for the invalid
tree entry names. Even on pretty high levels of optimization,
this seems to make a measurable improvement.
I accidentally used && in the check initially instead of || and
while debugging ended up improving the error reporting of issues
with adding tree entries. I thought I'd leave those changes, too.
My other PR revealed, that the /W4 parameter, we give to MSVC is ignored
because cmake set CMAKE_C_FLAGS already to /W3 and we overwrite it.
The command line tools gave me a D9025 warning for this on every file and
looking into the project properties page on MSVC 2008 tells, that it has
the warning level set to /W3.
However, the warnings introduced by /W4 are far to useless for having
them enabled. So just disable them.
The reason, why libgit2 currently cannot support compiling via the command-line
tools cl/nmake from WinSDK and/or Microsoft Visual Studio, seems to be a
missing dependency on the generated precompiled header file.
The Visual Studio IDE automatically inserts this dependency when it sees the
right combination of "/Y" parameters.
This patch allows to compile using command line tools by disabling precompiled
headers for NON-IDE builds.
A number of diff APIs and the `git_checkout_index` API take a
`git_repository` object an operate on the index. This updates
them to take a `git_index` pointer explicitly and only fall back
on the `git_repository` index if the index input is NULL. This
makes it easier to operate on a temporary index.
