From 25bbb1a8ff7074a56b4da98de24a549e223d0009 Mon Sep 17 00:00:00 2001
From: Jay Weisskopf <jay@jayschwa.net>
Date: Fri, 29 Jun 2018 22:22:04 -0400
Subject: [PATCH] Fix version detection for out-of-source builds

Git was called in the build directory and not the source directory.
This works fine when the build directory resides within the source
repository, but doesn't work for out-of-source builds. Example:

```
~/zigbuild$ cmake ../zig
fatal: not a git repository (or any of the parent directories): .git
Configuring zig version 0.2.0+
```

Use Git's `-C <path>` flag to always point to the source directory so
that it doesn't matter where the build directory lives.
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4838aeb797..e8873d2e67 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ set(ZIG_VERSION "${ZIG_VERSION_MAJOR}.${ZIG_VERSION_MINOR}.${ZIG_VERSION_PATCH}"
 find_program(GIT_EXE NAMES git)
 if(GIT_EXE)
     execute_process(
-        COMMAND ${GIT_EXE} name-rev HEAD --tags --name-only --no-undefined --always
+        COMMAND ${GIT_EXE} -C ${CMAKE_SOURCE_DIR} name-rev HEAD --tags --name-only --no-undefined --always
         OUTPUT_VARIABLE ZIG_GIT_REV
         OUTPUT_STRIP_TRAILING_WHITESPACE)
     if(ZIG_GIT_REV MATCHES "\\^0$")