[pangomm/use-dllexport-2-42] pango/pangomm/meson.build: Define PANGOMM_BUILD

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

commit b60ad2d9ba7f2bd265a74532aba8940ba4888b1c
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 11 18:01:42 2020 +0800

    pango/pangomm/meson.build: Define PANGOMM_BUILD
    
    This will eventually let us tell the compiler that we want to use
    compiler directives to export the symbols, if we have determined that we
    have generated the sources using gmmproc 2.64.0 or later.  If an older
    gmmproc was used, we define PANGOMM_USE_GENDEF during the build to set
    PANGOMM_API as nothing.

 pango/pangomm/meson.build | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/pango/pangomm/meson.build b/pango/pangomm/meson.build
index f5898dc..0a57762 100644
--- a/pango/pangomm/meson.build
+++ b/pango/pangomm/meson.build
@@ -65,6 +65,12 @@ install_headers(extra_h_files, subdir: pangomm_pcname / 'pangomm')
 untracked_pangomm = 'untracked' / 'pango' / 'pangomm'
 src_untracked_pangomm = project_source_root / untracked_pangomm
 
+pangomm_cpp_args = [ '-DPANGOMM_BUILD=1' ]
+
+if is_msvc and not use_dll_export
+  pangomm_cpp_args += '-DPANGOMM_USE_GENDEF'
+endif
+
 if maintainer_mode
 
   # Maintainer mode. Generate .h and .cc files from .hg and .ccg files in ../src.
@@ -127,6 +133,7 @@ if maintainer_mode
   pango_int_lib = static_library('pangomm-int',
     built_cc_file_targets, built_h_file_targets, extra_cc_files,
     include_directories: extra_include_dirs,
+    cpp_args: pangomm_cpp_args,
     dependencies: pangomm_build_dep,
     install: false,
   )
@@ -170,6 +177,7 @@ else # not maintainer_mode
   pango_int_lib = static_library('pangomm-int',
     built_cc_files, extra_cc_files,
     include_directories: extra_include_dirs,
+    cpp_args: pangomm_cpp_args,
     dependencies: pangomm_build_dep,
     install: false,
   )