Use vcs_tag to get Git version instead of run_command

This way Meson will automatically keep the Git hash updated as you make
new Git commits, rather than forcing you to reconfigure the build again
every time you make a new commit to keep the commit hash updated.

binding/binding-mri.cpp

@@ -64,6 +64,10 @@ extern "C" {
 #include <SDL_loadso.h>
 #include <SDL_power.h>
 
+#ifndef MKXPZ_BUILD_XCODE
+#  include "git-hash.h"
+#endif // MKXPZ_BUILD_XCODE
+
 extern const char module_rpg1[];
 extern const char module_rpg2[];
 extern const char module_rpg3[];

meson.build

@@ -7,8 +7,6 @@ if get_option('retro') == false and host_system == 'darwin'
     error('\nThis Meson project no longer supports macOS. Please use the Xcode project instead.')
 endif
 
-git_hash = run_command('git', 'rev-parse', '--short', 'HEAD', check: true).stdout().strip()
-
 compilers = {'cpp': meson.get_compiler('cpp')}
 
 global_sources = []
@@ -24,7 +22,6 @@ win64 = (sizeof['void*'] != sizeof['long'])
 
 global_args += '-DMKXPZ_BUILD_MESON'
 global_args += '-DMKXPZ_VERSION="@0@"'.format(meson.project_version())
-global_args += '-DMKXPZ_GIT_HASH="@0@"'.format(git_hash)
 global_args += '-DHAVE_NANOSLEEP'
 # ====================
 # Ext libs
@@ -149,7 +146,6 @@ if get_option('retro') == true
 
     retro_defines = [
         '-DMKXPZ_VERSION="@0@"'.format(meson.project_version()),
-        '-DMKXPZ_GIT_HASH="@0@"'.format(git_hash),
         '-DWASM_RT_SKIP_SIGNAL_RECOVERY',
         '-DWASM_RT_TRAP_HANDLER=mkxp_sandbox_trap_handler',
         '-DMKXPZ_RETRO',
@@ -247,6 +243,7 @@ if get_option('retro') == true
             include_directories(join_paths(retro_phase1, 'sdl/include')),
         ],
         sources: [
+            vcs_tag(command: ['git', 'rev-parse', '--short', 'HEAD'], input: 'src/git-hash.h.in', output: 'git-hash.h', replace_string: '@MKXPZ_GIT_HASH@'),
             'src/core.cpp',
             'src/sharedstate.cpp',
             'src/audio/alstream.cpp',
@@ -286,6 +283,8 @@ if get_option('retro') == true
     )
 else
 
+global_sources += vcs_tag(command: ['git', 'rev-parse', '--short', 'HEAD'], input: 'src/git-hash.h.in', output: 'git-hash.h', replace_string: '@MKXPZ_GIT_HASH@')
+
 xxd = find_program('xxd', native: true)
 
 # STEAMWORKS

src/core.cpp

@@ -29,6 +29,7 @@
 #include <AL/alext.h>
 #include <fluidlite.h>
 #include <fluidsynth_priv.h>
+#include "git-hash.h"
 #include "../binding-sandbox/sandbox.h"
 #include "../binding-sandbox/binding-sandbox.h"
 #include "../binding-sandbox/core.h"

src/git-hash.h.in

@@ -0,0 +1,3 @@
+#ifndef MKXPZ_GIT_HASH
+#define MKXPZ_GIT_HASH "@MKXPZ_GIT_HASH@"
+#endif /* MKXPZ_GIT_HASH */