From 6524ce770587d5a35edb5d114b13414712a0a5e2 Mon Sep 17 00:00:00 2001
From: Robin De Schepper <robin.deschepper93@gmail.com>
Date: Wed, 2 Oct 2024 08:36:23 +0200
Subject: [PATCH] Avoid `bash\r` with gitattributes eol (#2252)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Building arbor on WSL from a clone checked out with Windows line endings
causes the following error:

```
[  0%] Generating _always_rebuild
[  2%] Generating version.hpp-test
/usr/bin/env: ‘bash\r’: No such file or directory
make[2]: *** [arbor/include/CMakeFiles/generate_version_hpp.dir/build.make:77: arbor/include/version.hpp-test] Error 127
make[2]: *** Deleting file 'arbor/include/version.hpp-test'
make[1]: *** [CMakeFiles/Makefile2:1613: arbor/include/CMakeFiles/generate_version_hpp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[  2%] Building CXX object ext/units/units/CMakeFiles/units.dir/units.cpp.o
[  2%] Building CXX object ext/units/units/CMakeFiles/units.dir/commodities.cpp.o
[  4%] Building CXX object ext/units/units/CMakeFiles/units.dir/x12_conv.cpp.o
[  4%] Building CXX object ext/units/units/CMakeFiles/units.dir/r20_conv.cpp.o
[  4%] Linking CXX static library ../../../lib/libunits.a
[  4%] Built target units
make: *** [Makefile:136: all] Error 2
```

The shebang line in `arbor/include/git-source-id` of the following
custom command is misinterpreted:

```
add_custom_command(
    OUTPUT version.hpp-test
    DEPENDS _always_rebuild
    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/git-source-id ${FULL_VERSION_STRING} ${ARB_ARCH} ${arb_config_str} ${arb_features} > version.hpp-test
)
```

Prepending `bash` directly to the custom command seems to fix the
problem. I don't know how to confirm whether the `version.hpp-test`
mechanism still works as intended, so someone should probably review
that.
---
 .gitattributes | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 .gitattributes

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000..d080e5c3b5
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+arbor/include/git-source-id text eol=lf