meson: Add -DLZ4_DLL_EXPORT=1 to build dynamic lib on Windows

Thanks @nacho for pointing it out.

2 files changed, 7 insertions, 1 deletions

diff --git a/contrib/meson/lib/meson.build b/contrib/meson/lib/meson.build
index f1deb58..e782334 100644
--- a/contrib/meson/lib/meson.build
+++ b/contrib/meson/lib/meson.build
@@ -27,6 +27,10 @@ if use_debug
 endif
 liblz4_c_args += cc.get_supported_arguments(liblz4_debug_cflags)
 
+if host_machine_os == os_windows and default_library != 'static'
+  liblz4_c_args += '-DLZ4_DLL_EXPORT=1'
+endif
+
 liblz4 = library('lz4',
   liblz4_sources,
   include_directories: liblz4_includes,
@@ -47,6 +51,7 @@ pkgconfig.generate(liblz4,
 install_headers(join_paths(lz4_root_dir, 'lib/lz4.h'),
   join_paths(lz4_root_dir, 'lib/lz4hc.h'),
   join_paths(lz4_root_dir, 'lib/lz4frame.h'))
-if get_option('default_library') != 'shared'
+
+if default_library != 'shared'
   install_headers(join_paths(lz4_root_dir, 'lib/lz4frame_static.h'))
 endif
diff --git a/contrib/meson/meson.build b/contrib/meson/meson.build
index e25e7c0..bf30eae 100644
--- a/contrib/meson/meson.build
+++ b/contrib/meson/meson.build
@@ -18,6 +18,7 @@ cc = meson.get_compiler('c')
 pkgconfig = import('pkgconfig')
 python3 = import('python').find_installation()
 c_std = get_option('c_std')
+default_library = get_option('default_library')
 
 host_machine_os = host_machine.system()
 os_windows = 'windows'