CMake: Add support for git_commit_info.sh

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32506cdd5611899d5cbd01870057935fbee7734d..2da569ae1be639336f74bbbf2f3cbc1e46ccbb82 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -466,6 +466,34 @@ if(CMAKE_C_COMPILER_ID MATCHES GNU|Clang)
 endif()
 
 
+######################
+# Git commit version #
+######################
+
+set(XZ_GIT_COMMIT_INFO_DEFAULT OFF)
+if(UNIX AND IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/.git")
+    set(XZ_GIT_COMMIT_INFO_DEFAULT ON)
+endif()
+
+option(XZ_GIT_COMMIT_INFO "Include Git commit information in the version \
+string when building from a Git repository" "${XZ_GIT_COMMIT_INFO_DEFAULT}")
+
+if(XZ_GIT_COMMIT_INFO)
+    file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/git_commit_info")
+    add_custom_target(git_commit_info
+        BYPRODUCTS git_commit_info/git_commit_info.h
+        COMMAND /bin/sh
+                "${CMAKE_CURRENT_SOURCE_DIR}/build-aux/git_commit_info.sh"
+                "${CMAKE_CURRENT_SOURCE_DIR}"
+                "${CMAKE_CURRENT_BINARY_DIR}/git_commit_info/git_commit_info.h"
+        VERBATIM)
+    include_directories("${CMAKE_CURRENT_BINARY_DIR}/git_commit_info")
+    add_compile_definitions(HAVE_GIT_COMMIT_INFO_H)
+else()
+    add_custom_target(git_commit_info)
+endif()
+
+
 #############################################################################
 # liblzma
 #############################################################################
@@ -620,6 +648,8 @@ target_include_directories(liblzma PRIVATE
     src/common
 )
 
+add_dependencies(liblzma git_commit_info)
+
 
 #############
 # Threading #
@@ -1954,6 +1984,8 @@ if(HAVE_DECODERS)
             src/xzdec/xzdec.c
         )
 
+        add_dependencies("${XZDEC}" git_commit_info)
+
         target_include_directories("${XZDEC}" PRIVATE
             src/common
             src/liblzma/api
@@ -2030,6 +2062,8 @@ if(XZ_TOOL_LZMAINFO AND HAVE_DECODERS)
         src/lzmainfo/lzmainfo.c
     )
 
+    add_dependencies(lzmainfo git_commit_info)
+
     target_include_directories(lzmainfo PRIVATE
         src/common
         src/liblzma/api
@@ -2125,6 +2159,8 @@ if(XZ_TOOL_XZ)
         src/xz/util.h
     )
 
+    add_dependencies(xz git_commit_info)
+
     target_include_directories(xz PRIVATE
         src/common
         src/liblzma/api