[tepl/master.msvc: 34/36] meson: Fix linking tepl library on Visual Studio

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

commit 5ea5cd4d0a2a35af32eb33c75088cc41d28f730a
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Apr 28 16:16:11 2020 +0800

    meson: Fix linking tepl library on Visual Studio
    
    Some of the linker flags cannot be used for Visual Studio, and we can't
    just link a DLL entirely from a static library on Visual Studio, as the
    linker will optimize things out as it does not see the symbols being
    used.
    
    As a result, instead of linking using just the static library, we call
    extract_all_objects() on the static library in order to link the final
    tepl .so/.dll on all builds.
    
    Also rename 'c_compiler' to 'CC', as per the variable naming
    conventions, as this is used outside of $(srcroot)/meson.build as well.

 meson.build      |  6 +++---
 tepl/meson.build | 16 ++++++++++++----
 2 files changed, 15 insertions(+), 7 deletions(-)
---
diff --git a/meson.build b/meson.build
index 1f8f7ae..f03de99 100644
--- a/meson.build
+++ b/meson.build
@@ -78,11 +78,11 @@ add_project_arguments(
 # even at the maximum level.
 # The following warning_cflags suppose that warning_level=2.
 
-c_compiler = meson.get_compiler('c')
+CC = meson.get_compiler('c')
 
 warning_cflags = []
 
-if c_compiler.get_id() == 'msvc'
+if CC.get_id() == 'msvc'
   # Use GLib's msvc_recommended_pragmas.h to filter out
   # the warnings we don't really need to worry about,
   # but do make the ones we want to be wary stand out
@@ -134,7 +134,7 @@ else
   ]
 endif
 
-supported_warning_cflags = c_compiler.get_supported_arguments(warning_cflags)
+supported_warning_cflags = CC.get_supported_arguments(warning_cflags)
 add_project_arguments(supported_warning_cflags, language: 'c')
 ##### end CFLAGS
 
diff --git a/tepl/meson.build b/tepl/meson.build
index fe257c0..b89df36 100644
--- a/tepl/meson.build
+++ b/tepl/meson.build
@@ -127,13 +127,21 @@ TEPL_STATIC_DEP = declare_dependency(
   dependencies: TEPL_DEPS
 )
 
-symbol_map = meson.current_source_dir() / 'symbol.map'
+tepl_link_args = []
+tepl_link_depends = []
+
+if CC.get_argument_syntax() != 'msvc'
+  symbol_map = meson.current_source_dir() / 'symbol.map'
+  tepl_link_args = '-Wl,--version-script,' + symbol_map
+  tepl_link_depends = symbol_map
+endif
 
 tepl_lib = library(
   'tepl-@0@'.format(TEPL_API_VERSION),
-  link_whole: tepl_static_lib,
-  link_args: '-Wl,--version-script,' + symbol_map,
-  link_depends: symbol_map,
+  dependencies: TEPL_DEPS,
+  link_args: tepl_link_args,
+  link_depends: tepl_link_depends,
+  objects: tepl_static_lib.extract_all_objects(),
   version: TEPL_LT_VERSION,
   install: true
 )