(arrow) branch main updated: GH-49789: [C++] Use `CMAKE_INSTALL_DOCDIR` instead of static `share/doc/${PROJECT_NAME}` (#49790)

[kou]

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The following commit(s) were added to refs/heads/main by this push:
     new 09cc2cfb31 GH-49789: [C++] Use `CMAKE_INSTALL_DOCDIR` instead of 
static `share/doc/${PROJECT_NAME}` (#49790)
09cc2cfb31 is described below

commit 09cc2cfb31356d1b850e1f3705c91d87947df994
Author: Sutou Kouhei <k...@clear-code.com>
AuthorDate: Mon Apr 20 20:17:00 2026 +0900

    GH-49789: [C++] Use `CMAKE_INSTALL_DOCDIR` instead of static 
`share/doc/${PROJECT_NAME}` (#49790)
    
    ### Rationale for this change
    
    `CMAKE_INSTALL_DOCDIR` is the standard variable for install document 
directory. Packages use this variable to change install document directory.
    
    ### What changes are included in this PR?
    
    Use `CMAKE_INSTALL_DOCDIR` instead of static `share/doc/${PROJECT_NAME}`
    
    ### Are these changes tested?
    
    Yes.
    
    ### Are there any user-facing changes?
    
    Yes.
    * GitHub Issue: #49789
    
    Authored-by: Sutou Kouhei <k...@clear-code.com>
    Signed-off-by: Sutou Kouhei <k...@clear-code.com>
---
 cpp/CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index a77ed39eac..4c44db6983 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -174,7 +174,7 @@ set(ARROW_GDB_DIR 
"${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}/gdb")
 set(ARROW_FULL_GDB_DIR "${CMAKE_INSTALL_FULL_DATADIR}/${PROJECT_NAME}/gdb")
 set(ARROW_GDB_AUTO_LOAD_DIR "${CMAKE_INSTALL_DATADIR}/gdb/auto-load")
 set(ARROW_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}/cmake")
-set(ARROW_DOC_DIR "share/doc/${PROJECT_NAME}")
+set(ARROW_DOC_DIR "${CMAKE_INSTALL_DOCDIR}")
 
 set(BUILD_SUPPORT_DIR "${CMAKE_SOURCE_DIR}/build-support")