SDL_net: cmake: pass revision to wikiheaders.pl to avoid executing git

From 91a086dfee81c57985fec898eb58d2f64f431202 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 29 Sep 2023 05:34:29 +0200
Subject: [PATCH] cmake: pass revision to wikiheaders.pl to avoid executing git

---
 .github/workflows/main.yml               |   8 +-
 CMakeLists.txt                           |   7 +-
 build-scripts/wikiheaders.pl             |  49 +++-
 cmake/GetGitRevisionDescription.cmake    | 284 +++++++++++++++++++++++
 cmake/GetGitRevisionDescription.cmake.in |  43 ++++
 cmake/PrivateSdlFunctions.cmake          |  21 ++
 cmake/sdlmanpages.cmake                  |  12 +-
 7 files changed, 414 insertions(+), 10 deletions(-)
 create mode 100644 cmake/GetGitRevisionDescription.cmake
 create mode 100644 cmake/GetGitRevisionDescription.cmake.in

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index dc02bb5..8446c26 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -18,8 +18,8 @@ jobs:
           - { name: 'Windows msys2 (mingw64)',  os: windows-latest, shell: 'msys2 {0}', msystem: mingw64, msys-env: mingw-w64-x86_64 }
 #          - { name: 'Windows msys2 (clang32)',  os: windows-latest, shell: 'msys2 {0}', msystem: clang32, msys-env: mingw-w64-clang-i686 }
           - { name: 'Windows msys2 (clang64)',  os: windows-latest, shell: 'msys2 {0}', msystem: clang64, msys-env: mingw-w64-clang-x86_64 }
-#          - { name: 'Windows MSVC (x86)',       os: windows-latest, shell: sh, msvc: true, msvc-arch: x86 }
-          - { name: 'Windows MSVC (x64)',       os: windows-latest, shell: sh, msvc: true, msvc-arch: x64 }
+#          - { name: 'Windows MSVC (x86)',       os: windows-latest, shell: sh, msvc: true, msvc-arch: x86, cmake: '-DPerl_ROOT=C:/Strawberry/perl/bin/' }
+          - { name: 'Windows MSVC (x64)',       os: windows-latest, shell: sh, msvc: true, msvc-arch: x64, cmake: '-DPerl_ROOT=C:/Strawberry/perl/bin/' }
 #          - { name: 'Windows MSVC (arm32)',     os: windows-latest, shell: sh, msvc: true, msvc-arch: amd64_arm, cross: true }
 #          - { name: 'Windows MSVC (arm64)',     os: windows-latest, shell: sh, msvc: true, msvc-arch: amd64_arm64, cross: true }
     defaults:
@@ -40,6 +40,7 @@ jobs:
             ${{ matrix.platform.msys-env }}-cmake
             ${{ matrix.platform.msys-env }}-crt
             ${{ matrix.platform.msys-env }}-ninja
+            ${{ matrix.platform.msys-env }}-perl
       - name: Get SDL3_net sources
         uses: actions/checkout@v3
       - name: Install Ninja
@@ -60,7 +61,8 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release \
             -DCMAKE_INSTALL_PREFIX=prefix \
             -DSDL3NET_WERROR=ON \
-            -DCMAKE_INSTALL_PREFIX=prefix
+            -DCMAKE_INSTALL_PREFIX=prefix \
+            ${{ matrix.platform.cmake }}
 
       - name: Build (CMake)
         run: |
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 895e739..80ea69a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,9 @@ project(SDL3_net
     VERSION "${MAJOR_VERSION}.${MINOR_VERSION}.${MICRO_VERSION}"
 )
 
-include(PrivateSdlFunctions)
-include(sdlmanpages)
+include("${SDL3_net_SOURCE_DIR}/cmake/GetGitRevisionDescription.cmake")
+include("${SDL3_net_SOURCE_DIR}/cmake/PrivateSdlFunctions.cmake")
+include("${SDL3_net_SOURCE_DIR}/cmake/sdlmanpages.cmake")
 sdl_calculate_derived_version_variables(${MAJOR_VERSION} ${MINOR_VERSION} ${MICRO_VERSION})
 
 message(STATUS "Configuring ${PROJECT_NAME} ${PROJECT_VERSION}")
@@ -229,10 +230,12 @@ if(SDL3NET_INSTALL)
     )
 
     if(SDL3NET_INSTALL_MAN)
+        sdl_get_git_revision_hash(SDL3NET_REVISION)
         SDL_generate_manpages(
             HEADERS_DIR "${PROJECT_SOURCE_DIR}/include/SDL3_net"
             SYMBOL "SDLNet_Init"
             WIKIHEADERS_PL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/build-scripts/wikiheaders.pl"
+            REVISION "${SDL3NET_REVISION}"
         )
     endif()
 endif()
diff --git a/build-scripts/wikiheaders.pl b/build-scripts/wikiheaders.pl
index bb09faa..c2bb8ed 100755
--- a/build-scripts/wikiheaders.pl
+++ b/build-scripts/wikiheaders.pl
@@ -31,6 +31,7 @@
 my $wikipreamble = undef;
 my $changeformat = undef;
 my $manpath = undef;
+my $gitrev = undef;
 
 foreach (@ARGV) {
     $warn_about_missing = 1, next if $_ eq '--warn-about-missing';
@@ -47,6 +48,9 @@
     } elsif (/\A--manpath=(.*)\Z/) {
         $manpath = $1;
         next;
+    } elsif (/\A--rev=(.*)\Z/) {
+        $gitrev = $1;
+        next;
     }
     $srcpath = $_, next if not defined $srcpath;
     $wikipath = $_, next if not defined $wikipath;
@@ -788,6 +792,45 @@ sub usage {
 }
 closedir(DH);
 
+delete $wikifuncs{"Undocumented"};
+
+{
+    my $path = "$wikipath/Undocumented.md";
+    open(FH, '>', $path) or die("Can't open '$path': $!\n");
+
+    print FH "# Undocumented\n\n";
+
+    print FH "## Functions defined in the headers, but not in the wiki\n\n";
+    my $header_only_func = 0;
+    foreach (sort keys %headerfuncs) {
+        my $fn = $_;
+        if (not defined $wikifuncs{$fn}) {
+            print FH "- [$fn]($fn)\n";
+            $header_only_func = 1;
+        }
+    }
+    if (!$header_only_func) {
+        print FH "(none)\n";
+    }
+    print FH "\n";
+
+    print FH "## Functions defined in the wiki, but not in the headers\n\n";
+
+    my $wiki_only_func = 0;
+    foreach (sort keys %wikifuncs) {
+        my $fn = $_;
+        if (not defined $headerfuncs{$fn}) {
+            print FH "- [$fn]($fn)\n";
+            $wiki_only_func = 1;
+        }
+    }
+    if (!$wiki_only_func) {
+        print FH "(none)\n";
+    }
+    print FH "\n";
+
+    close(FH);
+}
 
 if ($warn_about_missing) {
     foreach (keys %wikifuncs) {
@@ -1437,8 +1480,10 @@ sub usage {
     close(FH);
     }
 
-    my $gitrev = `cd "$srcpath" ; git rev-list HEAD~..`;
-    chomp($gitrev);
+    if (!$gitrev) {
+        $gitrev = `cd "$srcpath" ; git rev-list HEAD~..`;
+        chomp($gitrev);
+    }
 
     # !!! FIXME
     open(FH, '<', "$srcpath/$versionfname") or die("Can't open '$srcpath/$versionfname': $!\n");
diff --git a/cmake/GetGitRevisionDescription.cmake b/cmake/GetGitRevisionDescription.cmake
new file mode 100644
index 0000000..a08895c
--- /dev/null
+++ b/cmake/GetGitRevisionDescription.cmake
@@ -0,0 +1,284 @@
+# - Returns a version string from Git
+#
+# These functions force a re-configure on each git commit so that you can
+# trust the values of the variables in your build system.
+#
+#  get_git_head_revision(<refspecvar> <hashvar> [ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR])
+#
+# Returns the refspec and sha hash of the current head revision
+#
+#  git_describe(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe on the source tree, and adjusting
+# the output so that it tests false if an error occurs.
+#
+#  git_describe_working_tree(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe on the working tree (--dirty option),
+# and adjusting the output so that it tests false if an error occurs.
+#
+#  git_get_exact_tag(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe --exact-match on the source tree,
+# and adjusting the output so that it tests false if there was no exact
+# matching tag.
+#
+#  git_local_changes(<var>)
+#
+# Returns either "CLEAN" or "DIRTY" with respect to uncommitted changes.
+# Uses the return code of "git diff-index --quiet HEAD --".
+# Does not regard untracked files.
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2020 Ryan Pavlik <ryan.pavlik@gmail.com> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+#
+# Copyright 2009-2013, Iowa State University.
+# Copyright 2013-2020, Ryan Pavlik
+# Copyright 2013-2020, Contributors
+# SPDX-License-Identifier: BSL-1.0
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+if(__get_git_revision_description)
+    return()
+endif()
+set(__get_git_revision_description YES)
+
+# We must run the following at "include" time, not at function call time,
+# to find the path to this module rather than the path to a calling list file
+get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
+
+# Function _git_find_closest_git_dir finds the next closest .git directory
+# that is part of any directory in the path defined by _start_dir.
+# The result is returned in the parent scope variable whose name is passed
+# as variable _git_dir_var. If no .git directory can be found, the
+# function returns an empty string via _git_dir_var.
+#
+# Example: Given a path C:/bla/foo/bar and assuming C:/bla/.git exists and
+# neither foo nor bar contain a file/directory .git. This will return
+# C:/bla/.git
+#
+function(_git_find_closest_git_dir _start_dir _git_dir_var)
+    set(cur_dir "${_start_dir}")
+    set(git_dir "${_start_dir}/.git")
+    while(NOT EXISTS "${git_dir}")
+        # .git dir not found, search parent directories
+        set(git_previous_parent "${cur_dir}")
+        get_filename_component(cur_dir "${cur_dir}" DIRECTORY)
+        if(cur_dir STREQUAL git_previous_parent)
+            # We have reached the root directory, we are not in git
+            set(${_git_dir_var}
+                ""
+                PARENT_SCOPE)
+            return()
+        endif()
+        set(git_dir "${cur_dir}/.git")
+    endwhile()
+    set(${_git_dir_var}
+        "${git_dir}"
+        PARENT_SCOPE)
+endfunction()
+
+function(get_git_head_revision _refspecvar _hashvar)
+    _git_find_closest_git_dir("${CMAKE_CURRENT_SOURCE_DIR}" GIT_DIR)
+
+    if("${ARGN}" STREQUAL "ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR")
+        set(ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR TRUE)
+    else()
+        set(ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR FALSE)
+    endif()
+    if(NOT "${GIT_DIR}" STREQUAL "")
+        file(RELATIVE_PATH _relative_to_source_dir "${CMAKE_SOURCE_DIR}"
+             "${GIT_DIR}")
+        if("${_relative_to_source_dir}" MATCHES "[.][.]" AND NOT ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR)
+            # We've gone above the CMake root dir.
+            set(GIT_DIR "")
+        endif()
+    endif()
+    if("${GIT_DIR}" STREQUAL "")
+        set(${_refspecvar}
+            "GITDIR-NOTFOUND"
+            PARENT_SCOPE)
+        set(${_hashvar}
+            "GITDIR-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+
+    # Check if the current source dir is a git submodule or a worktree.
+    # In both cases .git is a file instead of a directory.
+    #
+    if(NOT IS_DIRECTORY ${GIT_DIR})
+        # The following git command will return a non empty string that
+        # points to the super project working tree if the current
+        # source dir is inside a git submodule.
+        # Otherwise the command will return an empty string.
+        #
+        execute_process(
+            COMMAND "${GIT_EXECUTABLE}" rev-parse
+                    --show-superproject-working-tree
+            WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+            OUTPUT_VARIABLE out
+            ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+        if(NOT "${out}" STREQUAL "")
+            # If out is empty, GIT_DIR/CMAKE_CURRENT_SOURCE_DIR is in a submodule
+            file(READ ${GIT_DIR} submodule)
+            string(REGEX REPLACE "gitdir: (.*)$" "\\1" GIT_DIR_RELATIVE
+                                 ${submodule})
+            string(STRIP ${GIT_DIR_RELATIVE} GIT_DIR_RELATIVE)
+            get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
+            get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE}
+                                   ABSOLUTE)
+            set(HEAD_SOURCE_FILE "${GIT_DIR}/HEAD")
+        else()
+            # GIT_DIR/CMAKE_CURRENT_SOURCE_DIR is in a worktree
+            file(READ ${GIT_DIR} worktree_ref)
+            # The .git directory contains a path to the worktree information directory
+            # inside the parent git repo of the worktree.
+            #
+            string(REGEX REPLACE "gitdir: (.*)$" "\\1" git_worktree_dir
+                                 ${worktree_ref})
+            string(STRIP ${git_worktree_dir} git_worktree_dir)
+            _git_find_closest_git_dir("${git_worktree_dir}" GIT_DIR)
+            set(HEAD_SOURCE_FILE "${git_worktree_dir}/HEAD")
+        endif()
+    else()
+        set(HEAD_SOURCE_FILE "${GIT_DIR}/HEAD")
+    endif()
+    set(GIT_DATA "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data")
+    if(NOT EXISTS "${GIT_DATA}")
+        file(MAKE_DIRECTORY "${GIT_DATA}")
+    endif()
+
+    if(NOT EXISTS "${HEAD_SOURCE_FILE}")
+        return()
+    endif()
+    set(HEAD_FILE "${GIT_DATA}/HEAD")
+    configure_file("${HEAD_SOURCE_FILE}" "${HEAD_FILE}" COPYONLY)
+
+    configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in"
+                   "${GIT_DATA}/grabRef.cmake" @ONLY)
+    include("${GIT_DATA}/grabRef.cmake")
+
+    set(${_refspecvar}
+        "${HEAD_REF}"
+        PARENT_SCOPE)
+    set(${_hashvar}
+        "${HEAD_HASH}"
+        PARENT_SCOPE)
+endfunction()
+
+function(git_describe _var)
+    if(NOT GIT_FOUND)
+        find_package(Git QUIET)
+    endif()
+    get_git_head_revision(refspec hash)
+    if(NOT GIT_FOUND)
+        set(${_var}
+            "GIT-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+    if(NOT hash)
+        set(${_var}
+            "HEAD-HASH-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+
+    # TODO sanitize
+    #if((${ARGN}" MATCHES "&&") OR
+    #	(ARGN MATCHES "||") OR
+    #	(ARGN MATCHES "\\;"))
+    #	message("Please report the following error to the project!")
+    #	message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
+    #endif()
+
+    #message(STATUS "Arguments to execute_process: ${ARGN}")
+
+    execute_process(
+        COMMAND "${GIT_EXECUTABLE}" describe --tags --always ${hash} ${ARGN}
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        RESULT_VARIABLE res
+        OUTPUT_VARIABLE out
+        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if(NOT res EQUAL 0)
+        set(out "${out}-${res}-NOTFOUND")
+    endif()
+
+    set(${_var}
+        "${out}"
+        PARENT_SCOPE)
+endfunction()
+
+function(git_describe_working_tree _var)
+    if(NOT GIT_FOUND)
+        find_package(Git QUIET)
+    endif()
+    if(NOT GIT_FOUND)
+        set(${_var}
+            "GIT-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+
+    execute_process(
+        COMMAND "${GIT_EXECUTABLE}" describe --dirty ${ARGN}
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        RESULT_VARIABLE res
+        OUTPUT_VARIABLE out
+        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if(NOT res EQUAL 0)
+        set(out "${out}-${res}-NOTFOUND")
+    endif()
+
+    set(${_var}
+        "${out}"
+        PARENT_SCOPE)
+endfunction()
+
+function(git_get_exact_tag _var)
+    git_describe(out --exact-match ${ARGN})
+    set(${_var}
+        "${out}"
+        PARENT_SCOPE)
+endfunction()
+
+function(git_local_changes _var)
+    if(NOT GIT_FOUND)
+        find_package(Git QUIET)
+    endif()
+    get_git_head_revision(refspec hash)
+    if(NOT GIT_FOUND)
+        set(${_var}
+            "GIT-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+    if(NOT hash)
+        set(${_var}
+            "HEAD-HASH-NOTFOUND"
+            PARENT_SCOPE)
+        return()
+    endif()
+
+    execute_process(
+        COMMAND "${GIT_EXECUTABLE}" diff-index --quiet HEAD --
+        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        RESULT_VARIABLE res
+        OUTPUT_VARIABLE out
+        ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+    if(res EQUAL 0)
+        set(${_var}
+            "CLEAN"
+            PARENT_SCOPE)
+    else()
+        set(${_var}
+            "DIRTY"
+            PARENT_SCOPE)
+    endif()
+endfunction()
diff --git a/cmake/GetGitRevisionDescription.cmake.in b/cmake/GetGitRevisionDescription.cmake.in
new file mode 100644
index 0000000..116efc4
--- /dev/null
+++ b/cmake/GetGitRevisionDescription.cmake.in
@@ -0,0 +1,43 @@
+#
+# Internal file for GetGitRevisionDescription.cmake
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+# Iowa State University HCI Graduate Program/VRAC
+#
+# Copyright 2009-2012, Iowa State University
+# Copyright 2011-2015, Contributors
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+# SPDX-License-Identifier: BSL-1.0
+
+set(HEAD_HASH)
+
+file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
+
+string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
+if(HEAD_CONTENTS MATCHES "ref")
+	# named branch
+	string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
+	if(EXISTS "@GIT_DIR@/${HEAD_REF}")
+		configure_file("@GIT_DIR@/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
+	else()
+		configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)
+		file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)
+		if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")
+			set(HEAD_HASH "${CMAKE_MATCH_1}")
+		endif()
+	endif()
+else()
+	# detached HEAD
+	configure_file("@GIT_DIR@/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
+endif()
+
+if(NOT HEAD_HASH)
+	file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
+	string(STRIP "${HEAD_HASH}" HEAD_HASH)
+endif()
diff --git a/cmake/PrivateSdlFunctions.cmake b/cmake/PrivateSdlFunctions.cmake
index 7965897..fdfa399 100644
--- a/cmake/PrivateSdlFunctions.cmake
+++ b/cmake/PrivateSdlFunctions.cmake
@@ -286,3 +286,24 @@ function(sdl_no_deprecated_errors TARGET)
     target_compile_options(${TARGET} PRIVATE "-Wno-error=deprecated-declarations")
 endif()
 endfunction()
+
+function(sdl_get_git_revision_hash VARNAME)
+
+    set("${VARNAME}" "" CACHE STRING "${PROJECT_NAME} revision")
+    set(revision "${${VARNAME}}")
+    if(NOT revision)
+      if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/VERSION.txt")
+        # If VERSION.txt exists, it contains the SDL version
+        file(READ "${CMAKE_CURRENT_SOURCE_DIR}/VERSION.txt" revision_version)
+        string(STRIP "${revision_version}" revision_version)
+      else()
+        # If VERSION.txt does not exist, use git to calculate a version
+        git_describe(revision_version)
+        if(NOT revision_version)
+          set(revision_version "${PROJECT_VERSION}-no-vcs")
+        endif()
+      endif()
+      set(revision "${revision_version}")
+    endif()
+    set("${VARNAME}" "${revision}" PARENT_SCOPE)
+endfunction()
diff --git a/cmake/sdlmanpages.cmake b/cmake/sdlmanpages.cmake
index f769128..dc3ebb6 100644
--- a/cmake/sdlmanpages.cmake
+++ b/cmake/sdlmanpages.cmake
@@ -2,7 +2,9 @@ include(CMakeParseArguments)
 include(GNUInstallDirs)
 
 function(SDL_generate_manpages)
-  cmake_parse_arguments(ARG "" "RESULT_VARIABLE;NAME;BUILD_DOCDIR;HEADERS_DIR;SOURCE_DIR;SYMBOL;OPTION_FILE;WIKIHEADERS_PL_PATH" "" ${ARGN})
+  cmake_parse_arguments(ARG "" "RESULT_VARIABLE;NAME;BUILD_DOCDIR;HEADERS_DIR;SOURCE_DIR;SYMBOL;OPTION_FILE;WIKIHEADERS_PL_PATH;REVISION" "" ${ARGN})
+
+  set(wikiheaders_extra_args)
 
   if(NOT ARG_NAME)
     set(ARG_NAME "${PROJECT_NAME}")
@@ -25,6 +27,10 @@ function(SDL_generate_manpages)
     message(FATAL_ERROR "Missing required SYMBOL argument")
   endif()
 
+  if(ARG_REVISION)
+    list(APPEND wikiheaders_extra_args "--rev=${ARG_REVISION}")
+  endif()
+
   if(NOT ARG_BUILD_DOCDIR)
     set(ARG_BUILD_DOCDIR "${CMAKE_CURRENT_BINARY_DIR}/docs")
   endif()
@@ -40,13 +46,13 @@ function(SDL_generate_manpages)
     add_custom_command(
       OUTPUT "${BUILD_WIKIDIR}/${ARG_SYMBOL}.md"
       COMMAND "${CMAKE_COMMAND}" -E make_directory "${BUILD_WIKIDIR}"
-      COMMAND "${PERL_EXECUTABLE}" "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_SOURCE_DIR}" "${BUILD_WIKIDIR}" "--options=${ARG_OPTION_FILE}" --copy-to-wiki
+      COMMAND "${PERL_EXECUTABLE}" "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_SOURCE_DIR}" "${BUILD_WIKIDIR}" "--options=${ARG_OPTION_FILE}" --copy-to-wiki ${wikiheaders_extra_args}
       DEPENDS ${HEADER_FILES} "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_OPTION_FILE}"
       COMMENT "Generating ${ARG_NAME} wiki markdown files"
     )
     add_custom_command(
       OUTPUT "${BUILD_MANDIR}/man3/${ARG_SYMBOL}.3"
-      COMMAND "${PERL_EXECUTABLE}" "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_SOURCE_DIR}" "${BUILD_WIKIDIR}" "--options=${ARG_OPTION_FILE}" "--manpath=${BUILD_MANDIR}" --copy-to-manpages
+      COMMAND "${PERL_EXECUTABLE}" "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_SOURCE_DIR}" "${BUILD_WIKIDIR}" "--options=${ARG_OPTION_FILE}" "--manpath=${BUILD_MANDIR}" --copy-to-manpages ${wikiheaders_extra_args}
       DEPENDS  "${BUILD_WIKIDIR}/${ARG_SYMBOL}.md" "${ARG_WIKIHEADERS_PL_PATH}" "${ARG_OPTION_FILE}"
       COMMENT "Generating ${ARG_NAME} man pages"
     )