rust: add a build.rs script for tests

Cargo uses the build.rs script to determine how to compile and link a
binary.  The only binary we're generating, however, is for our tests,
but in a future commit, we're going to link against libgit.a for some
functionality and we'll need to make sure the test binaries are
complete.

Add a build.rs file for this case and specify the files we're going to
be linking against.  Because we cannot specify different dependencies
when building our static library versus our tests, update the Makefile
to specify these dependencies for our static library to avoid race
conditions during build.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index 88ae4c4b2fc632ddf501f95c4a96128ac5ae61c4..c51a020b6c13614c37d8da1d8295299265770cb2 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -3008,7 +3008,7 @@ scalar$X: scalar.o GIT-LDFLAGS $(GITLIBS)
 $(LIB_FILE): $(LIB_OBJS)
        $(QUIET_AR)$(RM) $@ && $(AR) $(ARFLAGS) $@ $^
 
-$(RUST_LIB): Cargo.toml $(RUST_SOURCES)
+$(RUST_LIB): Cargo.toml $(RUST_SOURCES) $(LIB_FILE)
        $(QUIET_CARGO)cargo build $(CARGO_ARGS)
 
 .PHONY: rust

diff --git a/build.rs b/build.rs
new file mode 100644 (file)
index 0000000..3724b3a
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,17 @@
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation: version 2 of the License, dated June 1991.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <https://www.gnu.org/licenses/>.
+
+fn main() {
+    println!("cargo:rustc-link-search=.");
+    println!("cargo:rustc-link-lib=git");
+    println!("cargo:rustc-link-lib=z");
+}