[gjs/meson.msvc: 1/8] meson.build: Don't check for GCC-specific items on MSVC

[Chun-wei Fan <fanchunwei src gnome org>]

commit cd2116a467252fc97290eabca94d30a9ddb7e744
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Oct 25 12:10:13 2019 +0800

    meson.build: Don't check for GCC-specific items on MSVC
    
    Instead, we use the msvc_recommended_pragmas.h as we do in the GTK
    stack, as well as in conjunction to disabling some other warnings,
    as we do in the the NMake Makefiles, so that we cover more or less the
    same items in MSVC builds.
    
    Since there is no -Bsymbolic-functions equivilant in MSVC, we just skip
    checking and using that as well.
    
    Also, make sure that we pass in the additional flags that we need for
    Visual Studio builds, as we did in the NMake Makefiles.

 meson.build | 57 +++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 43 insertions(+), 14 deletions(-)
---
diff --git a/meson.build b/meson.build
index 7ec0a9fe..1a4f9571 100644
--- a/meson.build
+++ b/meson.build
@@ -27,21 +27,43 @@ endif
 cxx = meson.get_compiler('cpp')
 cc = meson.get_compiler('c')
 
-add_project_arguments(cxx.get_supported_arguments([
-    '-fno-strict-aliasing',
-
-    # Ignore spurious compiler warnings for things that GLib and SpiderMonkey
-    # header files commonly do
-    '-Wno-variadic-macros',  # GLib uses these in header files
-    '-Wno-missing-field-initializers',  # SpiderMonkey JSClass, among others
-]), language: 'cpp')
-
-if get_option('bsymbolic_functions')
-    if not cxx.has_link_argument('-Bsymbolic-functions')
-        error('''-Bsymbolic-functions not supported, configure with
+if cxx.get_id() == 'msvc'
+    add_project_arguments(cxx.get_supported_arguments([
+        # Ignore spurious compiler warnings for things that GLib and SpiderMonkey
+        # header files commonly do
+        '-FImsvc_recommended_pragmas.h',
+        '-wd4530',
+        '-wd4099',
+        '-wd4251',
+        '-wd4291',
+        '-wd4800',
+
+        # Visual Studio do not come with ssize_t
+        '-Dssize_t=gssize',
+
+        # Required for 'extern constexpr' on MSVC
+        '-Zc:externConstexpr',
+
+        # We don't want 'min' or 'max' to interfere
+        '-DNOMINMAX',
+    ]), language: ['cpp', 'c'])
+else
+    add_project_arguments(cxx.get_supported_arguments([
+        '-fno-strict-aliasing',
+
+        # Ignore spurious compiler warnings for things that GLib and SpiderMonkey
+        # header files commonly do
+        '-Wno-variadic-macros',  # GLib uses these in header files
+        '-Wno-missing-field-initializers',  # SpiderMonkey JSClass, among others
+    ]), language: 'cpp')
+
+    if get_option('bsymbolic_functions')
+        if not cxx.has_link_argument('-Bsymbolic-functions')
+            error('''-Bsymbolic-functions not supported, configure with
 -Dbsymbolic_functions=false''')
+        endif
+        add_project_link_arguments('-Bsymbolic-functions', language: ['cpp', 'c'])
     endif
-    add_project_link_arguments('-Bsymbolic-functions', language: ['cpp', 'c'])
 endif
 
 # SpiderMonkey can be compiled with or without runtime type information, we must
@@ -437,10 +459,16 @@ else
     link_args += cxx.get_supported_link_arguments('-Wl,-undefined,error')
 endif
 
+extra_libgjs_cpp_args = []
+if host_machine.system() == 'windows'
+    # We need these defines to build properly for Windows
+    extra_libgjs_cpp_args += ['-DWIN32', '-DXP_WIN']
+endif
+
 libgjs = shared_library(meson.project_name(),
     libgjs_sources, libgjs_private_sources, module_resource_srcs,
     probes_header, probes_objfile,
-    cpp_args: ['-DGJS_COMPILATION'] + directory_defines,
+    cpp_args: ['-DGJS_COMPILATION'] + extra_libgjs_cpp_args + directory_defines,
     link_args: link_args, link_depends: [symbol_map, symbol_list],
     dependencies: libgjs_dependencies,
     version: '0.0.0', soversion: '0',
@@ -466,6 +494,7 @@ gjs_private_typelib = gjs_private_gir[1]
 gjs_console_srcs = ['gjs/console.cpp']
 
 gjs_console = executable('gjs-console', gjs_console_srcs,
+    cpp_args: extra_libgjs_cpp_args,
     dependencies: libgjs_dep, install: true)
 
 meson.add_install_script('sh', '-c',