Support implibs for executables on Windows

Add a boolean 'implib' kwarg to executable().  If true, it is permitted to
use the returned build target object in link_with:

On platforms where this makes sense (e.g. Windows), an implib is generated
for the executable and used when linking.  Otherwise, it has no effect.

(Rather than checking if it is a StaticLibrary or SharedLibary, BuildTarget
subclasses gain the is_linkable_target method to test if they can appear in
link_with:)

Also install any executable implib in a similar way to a shared library
implib, i.e. placing the implib in the appropriate place

Add tests of:
- a shared_module containing a reference to a symbol which is known (at link
time) to be provided by the executable
- trying to link with non-implib executables (should fail)
- installing the implib

(This last one needs a little enhancement of the installed file checking as
this is the first install test we have which needs to work with either
MSVC-style or GCC-style implib filenames)

1 files changed, 3 insertions, 1 deletions

diff --git a/mesonbuild/backend/vs2010backend.py b/mesonbuild/backend/vs2010backend.py
index 57b0437..4a92155 100644
--- a/mesonbuild/backend/vs2010backend.py
+++ b/mesonbuild/backend/vs2010backend.py
@@ -951,10 +951,12 @@ class Vs2010Backend(backends.Backend):
         ofile.text = '$(OutDir)%s' % target.get_filename()
         subsys = ET.SubElement(link, 'SubSystem')
         subsys.text = subsystem
-        if isinstance(target, build.SharedLibrary):
+        if (isinstance(target, build.SharedLibrary) or
+            isinstance(target, build.Executable)) and target.get_import_filename():
             # DLLs built with MSVC always have an import library except when
             # they're data-only DLLs, but we don't support those yet.
             ET.SubElement(link, 'ImportLibrary').text = target.get_import_filename()
+        if isinstance(target, build.SharedLibrary):
             # Add module definitions file, if provided
             if target.vs_module_defs:
                 relpath = os.path.join(down, target.vs_module_defs.rel_to_builddir(self.build_to_src))