[goocanvas/meson.msvc: 6/6] meson.build: Fix building on Visual Studio

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

commit d76419d1038ff897f19a464cb7b498f7e0f912ec
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Sat Jun 12 15:53:54 2021 +0800

    meson.build: Fix building on Visual Studio
    
    The Meson build files are almost ready to support building with Visual Studio,
    so update them a bit to fix that:
    
    *  Don't mandate looking for -lm.  Windows compilers ship math functions in its
       CRT import library and/or inline in the CRT headers.
    
    *  Define some compiler flags that are useful for Visual Studio-style builds
    
    *  Define BUILDING_GOOCANVAS when building the goocanvas library, so that we
       can export the symbols there using compiler directives

 meson.build     | 10 +++++++++-
 src/meson.build |  2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 83777f2..a727a16 100644
--- a/meson.build
+++ b/meson.build
@@ -58,7 +58,15 @@ cairo_dep = dependency('cairo', version: '>= 1.10.0')
 glib_dep = dependency('glib-2.0', version: '>= 2.28.0')
 gtk_dep = dependency('gtk+-3.0', version: '>= 3.0.0')
 
-m_dep = cc.find_library('m')
+m_dep = cc.find_library('m', required: false)
+
+if cc.get_argument_syntax() == 'msvc'
+  add_project_arguments(cc.get_supported_arguments([
+    '-utf-8',  # Use UTF-8 mode
+    '-FImsvc_recommended_pragmas.h',
+    '-D_USE_MATH_DEFINES',
+  ]), language: ['c'])
+endif
 
 enable_introspection = dependency('gobject-introspection-1.0', version: '>= 0.6.7', required: 
get_option('introspection')).found()
 
diff --git a/src/meson.build b/src/meson.build
index 061e75b..1c52689 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -84,7 +84,7 @@ libgoocanvas = shared_library(
   sources: sources + enum_sources,
   include_directories: top_inc,
   dependencies: deps + private_deps,
-  c_args: '-DG_LOG_DOMAIN="GooCanvas"',
+  c_args: [ '-DG_LOG_DOMAIN="GooCanvas"', '-DBUILDING_GOOCANVAS'],
   install: true,
   install_rpath: goocanvas_libdir,
 )