meson: Correct support for building on Windows

Let soversion base on version if not set. For example, if version is 3.6.0
and soversion is not defined, it is set to 3.

build/meson/lib/meson.build

@@ -111,8 +111,7 @@ libzstd = library('zstd',
   c_args: libzstd_c_args,
   dependencies: libzstd_deps,
   install: true,
-  version: zstd_libversion,
+  version: zstd_libversion)
-  soversion: '1')
 
 libzstd_dep = declare_dependency(link_with: libzstd,
   include_directories: libzstd_includes)

build/meson/meson.build

@@ -36,30 +36,30 @@ compiler_clang = 'clang'
 compiler_msvc = 'msvc'
 
 zstd_version = meson.project_version()
-zstd_libversion = ''
 
-# =============================================================================
+zstd_h_file = join_paths(meson.current_source_dir(), '../../lib/zstd.h')
-# Project directories
+GetZstdLibraryVersion_py = files('GetZstdLibraryVersion.py')
-# =============================================================================
+r = run_command(python3, GetZstdLibraryVersion_py, zstd_h_file)
+if r.returncode() == 0
+  output = r.stdout().strip()
+  if output.version_compare('>@0@'.format(zstd_version))
+    zstd_version = output
+    message('Project version is now: @0@'.format(zstd_version))
+  endif
+else
+  message('Cannot find project version in @0@'.format(zstd_h_file))
+endif
 
-zstd_rootdir = '../..'
+zstd_libversion = zstd_version
 
 # =============================================================================
 # Installation directories
 # =============================================================================
 
-if host_machine_os == os_windows
+zstd_prefix = get_option('prefix')
-  zstd_prefix = '.'
+zstd_bindir = get_option('bindir')
-  zstd_bindir = 'bin'
+zstd_datadir = get_option('datadir')
-  zstd_datadir = 'share'
+zstd_mandir = get_option('mandir')
-  zstd_mandir = join_paths(zstd_datadir, 'man')
-else
-  zstd_prefix = get_option('prefix')
-  zstd_bindir = join_paths(zstd_prefix, get_option('bindir'))
-  zstd_datadir = join_paths(zstd_prefix, get_option('datadir'))
-  zstd_mandir = join_paths(zstd_prefix, get_option('mandir'))
-endif
-
 zstd_docdir = join_paths(zstd_datadir, 'doc', meson.project_name())
 
 # =============================================================================
@@ -85,30 +85,6 @@ feature_zlib = get_option('zlib')
 feature_lzma = get_option('lzma')
 feature_lz4 = get_option('lz4')
 
-# =============================================================================
-# Helper scripts for Meson
-# =============================================================================
-
-GetZstdLibraryVersion_py = files('GetZstdLibraryVersion.py')
-
-# =============================================================================
-# Getting project version from zstd.h
-# =============================================================================
-
-zstd_h_file = join_paths(meson.current_source_dir(), zstd_rootdir, 'lib/zstd.h')
-r = run_command(python3, GetZstdLibraryVersion_py, zstd_h_file)
-if r.returncode() == 0
-  output = r.stdout().strip()
-  if output.version_compare('>@0@'.format(zstd_version))
-    zstd_version = output
-    message('Project version is now: @0@'.format(zstd_version))
-  endif
-endif
-
-if host_machine_os != os_windows
-  zstd_libversion = zstd_version
-endif
-
 # =============================================================================
 # Dependencies
 # =============================================================================

build/meson/programs/meson.build

@@ -88,14 +88,15 @@ install_man(join_paths(zstd_rootdir, 'programs/zstd.1'),
 
 InstallSymlink_py = '../InstallSymlink.py'
 zstd_man1_dir = join_paths(zstd_mandir, 'man1')
-man1_EXT = host_machine_os != os_windows ? '.1.gz' : '.1'
+bin_EXT = host_machine_os == os_windows ? '.exe' : ''
+man1_EXT = '.1.gz' # Meson automatically compresses manpages
 
 foreach f : ['zstdcat', 'unzstd']
-  meson.add_install_script(InstallSymlink_py, 'zstd', f, zstd_bindir)
+  meson.add_install_script(InstallSymlink_py, 'zstd' + bin_EXT, f + bin_EXT, zstd_bindir)
   meson.add_install_script(InstallSymlink_py, 'zstd' + man1_EXT, f + man1_EXT, zstd_man1_dir)
 endforeach
 
 if use_multi_thread
-  meson.add_install_script(InstallSymlink_py, 'zstd', 'zstdmt', zstd_bindir)
+  meson.add_install_script(InstallSymlink_py, 'zstd' + bin_EXT, 'zstdmt' + bin_EXT, zstd_bindir)
   meson.add_install_script(InstallSymlink_py, 'zstd' + man1_EXT, 'zstdmt' + man1_EXT, zstd_man1_dir)
 endif