KalleOlaviNiemitalo commented on code in PR #3447:
URL: https://github.com/apache/avro/pull/3447#discussion_r2249153168
##########
lang/c++/CMakeLists.txt:
##########
@@ -79,15 +79,18 @@ if (AVRO_BUILD_TESTS OR AVRO_USE_BOOST)
find_package (Boost 1.70 REQUIRED CONFIG COMPONENTS system)
endif ()
-include(FetchContent)
-FetchContent_Declare(
- fmt
- GIT_REPOSITORY https://github.com/fmtlib/fmt.git
- GIT_TAG 10.2.1
- GIT_PROGRESS TRUE
- USES_TERMINAL_DOWNLOAD TRUE
-)
-FetchContent_MakeAvailable(fmt)
+find_package(fmt)
+if (NOT fmt_FOUND)
+ include(FetchContent)
+ FetchContent_Declare(
+ fmt
+ GIT_REPOSITORY https://github.com/fmtlib/fmt.git
+ GIT_TAG 10.2.1
+ GIT_PROGRESS TRUE
+ USES_TERMINAL_DOWNLOAD TRUE
+ )
+ FetchContent_MakeAvailable(fmt)
+endif (NOT fmt_FOUND)
Review Comment:
Most other `endif` lines in this file don't repeat the condition. According
to <https://cmake.org/cmake/help/v3.14/command/if.html> and
<https://cmake.org/cmake/help/v3.14/command/endif.html>, repeating the
condition has been "legacy" and "supported for backward compatibility only"
since CMake 3.14, and was already optional in CMake 3.0.
However, two other `endif` lines in this file do repeat the condition, so
the style is already inconsistent.
It's not important to me what you choose here, but it caught my eye and I
was curious about CMake best practices.
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