zanmato1984 opened a new issue, #49164:
URL: https://github.com/apache/arrow/issues/49164
### Describe the enhancement requested
### Summary
When Arrow is added as a subproject (FetchContent + SOURCE_SUBDIR cpp),
CMake configuration fails in
`cpp/src/arrow/io/CMakeLists.txt:48`. The `if()` uses
`${ARROW_SIMD_LEVEL}` and crashes if the
variable is undefined, which happens because `ARROW_DEFINE_OPTIONS`
defaults to OFF for subprojects.
### Repro
Minimal CMakeLists.txt:
```
cmake_minimum_required(VERSION 3.20)
project(bundled-arrow-example LANGUAGES CXX)
include(FetchContent)
set(ARROW_BUILD_SHARED OFF CACHE BOOL "" FORCE)
set(ARROW_BUILD_STATIC ON CACHE BOOL "" FORCE)
set(ARROW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(ARROW_BUILD_UTILITIES OFF CACHE BOOL "" FORCE)
set(ARROW_COMPUTE OFF CACHE BOOL "" FORCE)
set(ARROW_ACERO OFF CACHE BOOL "" FORCE)
set(ARROW_DATASET OFF CACHE BOOL "" FORCE)
set(ARROW_IPC OFF CACHE BOOL "" FORCE)
set(ARROW_PARQUET OFF CACHE BOOL "" FORCE)
set(ARROW_VERSION "23.0.0")
FetchContent_Declare(
arrow
URL
https://github.com/apache/arrow/archive/refs/tags/apache-arrow-${ARROW_VERSION}.tar.gz
SOURCE_SUBDIR cpp
)
FetchContent_MakeAvailable(arrow)
```
Configure:
```
cmake -S . -B build
```
CMake fails with:
```
CMake Error at build/_deps/arrow-src/cpp/src/arrow/io/CMakeLists.txt:48 (if):
if given arguments:
"NOT" "(" "STREQUAL" "NONE" ")" "AND" "NOT" "(" "STREQUAL" "NEON" ")"
Unknown arguments specified
```
### Component(s)
C++
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