[PATCH] cmake: use writev(3p) wrapper as needed

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

This is a companion patch of 3b9b2c2a29a (compat/posix: introduce
writev(3p) wrapper, 2026-03-13) where support for using the `writev()`
wrapper was introduced in the `Makefile` and the Meson-based build, but
the CMake build still needs that treatment, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
    cmake: use writev(3p) wrapper as needed
    
    This was necessary to get Git for Windows v2.54.0-rc0's CI builds to
    pass successfully.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2078%2Fdscho%2Fwritev-vs-cmake-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2078/dscho/writev-vs-cmake-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/2078

 contrib/buildsystems/CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index c6cfb874ef..dce9c84d0b 100644
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -376,7 +376,7 @@ endif()
 #function checks
 set(function_checks
 	strcasestr memmem strlcpy strtoimax strtoumax strtoull
-	setenv mkdtemp poll pread memmem)
+	setenv mkdtemp poll pread memmem writev)
 
 #unsetenv,hstrerror are incompatible with windows build
 if(NOT WIN32)
@@ -421,6 +421,10 @@ if(NOT HAVE_MEMMEM)
 	list(APPEND compat_SOURCES compat/memmem.c)
 endif()
 
+if(NOT HAVE_WRITEV)
+	list(APPEND compat_SOURCES compat/writev.c)
+endif()
+
 if(NOT WIN32)
 	if(NOT HAVE_UNSETENV)
 		list(APPEND compat_SOURCES compat/unsetenv.c)

base-commit: 6e8d538aab8fe4dd07ba9fb87b5c7edcfa5706ad
-- 
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