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posix: uname: use BUILD_VERSION only if not empty

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The `BUILD_VERSION` can be defined but empty when built
without git, causing version to be missing from the uname
version string:

```
*** Booting Zephyr OS build 3.5.0 ***

Printing everything in utsname...
sysname[7]: Zephyr
nodename[7]: zephyr
release[13]: 3.5.0
version[61]:  Apr  1 2024 23:48:30
machine[8]: riscv64

uart:~$
```

Let's check if it is empty before using it, so that
`KERNEL_VERSION_STRING`, which is generated independently
with cmake can be used as a fallback:

```
*** Booting Zephyr OS build 3.5.0 ***

Printing everything in utsname...
sysname[7]: Zephyr
nodename[7]: zephyr
release[13]: 3.5.0
version[61]: 3.5.0 Apr  1 2024 23:53:48
machine[8]: riscv64

uart:~$
```

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This commit is contained in:
Yong Cong Sin 2024-04-02 14:56:37 +08:00 committed by Carles Cufí
parent fbaf7dfdc1
commit cd2c7874b9
1 changed files with 1 additions and 1 deletions
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2
lib/posix/options/uname.c
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@ -22,7 +22,7 @@
#define UTSNAME_VERSION(_ver) _ver
#endif
#ifdef BUILD_VERSION
#if defined(BUILD_VERSION) && !IS_EMPTY(BUILD_VERSION)
#define VERSION_BUILD STRINGIFY(BUILD_VERSION)
#else
#define VERSION_BUILD KERNEL_VERSION_STRING