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)

3 files changed, 17 insertions, 0 deletions

diff --git a/test cases/windows/12 exe implib/installed_files.txt b/test cases/windows/12 exe implib/installed_files.txt
new file mode 100644
index 000000000..d0ea8f6c4
--- /dev/null
+++ b/test cases/windows/12 exe implib/installed_files.txt
@@ -0,0 +1,4 @@
+usr/bin/prog.exe
+usr/bin/prog.pdb
+?gcc:usr/lib/libprog.exe.a
+?msvc:usr/lib/prog.lib
diff --git a/test cases/windows/12 exe implib/meson.build b/test cases/windows/12 exe implib/meson.build
new file mode 100644
index 000000000..2393e794c
--- /dev/null
+++ b/test cases/windows/12 exe implib/meson.build
@@ -0,0 +1,7 @@
+project('wintest', 'c')
+
+# Test that we can produce an implib for an executable on Windows, and that it
+# is installed along with the executable
+
+prog = executable('prog', 'prog.c', install: true, implib: true)
+test('wintest', prog)
diff --git a/test cases/windows/12 exe implib/prog.c b/test cases/windows/12 exe implib/prog.c
new file mode 100644
index 000000000..6d5a9f501
--- /dev/null
+++ b/test cases/windows/12 exe implib/prog.c
@@ -0,0 +1,6 @@
+#include <windows.h>
+
+int  __declspec(dllexport)
+main(int argc, char **argv) {
+    return 0;
+}