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This change allows to link the system version of libgit2 statically.
Since `-tags static` is already used for the bundled version of the
library and to avoid breaking old workflows, `-tags
static,system_libgit2` is now used to select that.
This means that the valid combinations are:
| Flag | Effect |
|-------------------------------|-----------------------------------------------|
| _No flags_ | Dynamically-linked against the system libgit2 |
| `-tags static,system_libgit2` | Statically-linked against the system libgit2 |
| `-tags static` | Statically-linked against the bundled libgit2 |
Note that there is no way to express dynamically linking against the
bundled libgit2 because that makes very little sense, since the binaries
wouldn't be able to be distributed. If that's still desired, the
`PKG_CONFIG_PATH` environment variable can set before building the code.
[`Makefile`](https://github.com/libgit2/git2go/blob/master/Makefile) has
an example of how it is used in the CI.
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This uprevs libgit2 to the latest and greatest.
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This uprevs libgit2 to the latest and greatest.
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New version is here!
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This change:
* Uses the installed version of both the library and the pkgconfig file,
which fixes path resolution on Ubuntu Xenial.
* Uses quoting liberally so that paths with spaces in them are correctly
handled.
* Moves the build+install directories to static-build/ in the git2go
repository to avoid having a dirty vendor/libgit2 checkout.
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When using the static linking option on platforms that use pkg-config,
use ONLY pkg-config to get the CFLAGS and LDFLAGS. This prevents pulling
in dependencies and flags for any non-vendored version that may be
present on the host.
The main practical effect of this is that if someone doesn't need/want
any sort of remote access support at all they can completely disable
libcurl, libssh2, libssl, etc and produce a smaller/simpler binary and
greatly simplify their build-time dependencies. When done properly, the
generated pkg-config file will tell cgo everything it needs to know.
This also prevents confusion if there is a system copy of libgit2 that
is being given priority over the vendored build.
Signed-off-by: Ryan Graham <[email protected]>
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