meson, build/windows: generate .pdb (CodeView) debug symbols

This makes possible to debug with DIA SDK, if wanted by the developer.
Also, this is needed to create .appxsym files for MS Store debugging.

Ideally meson should be able to install for us, but apparently it doesn't.
See https://github.com/mesonbuild/meson/issues/12977

build/windows/gitlab-ci/3_bundle-gimp-uni_base.sh

@@ -139,6 +139,13 @@ for exe in "${binArray[@]}"; do
   cp -fr $exe ${GIMP_DISTRIB}/bin/
 done
 
+### .pdb (CodeView) debug symbols
+### TODO: REMOVE 'if [[ "$MSYSTEM...' WHEN GCC 14 IS ON MSYS2
+### crossroad don't have LLVM/Clang backend yet
+if [[ "$MSYSTEM_CARCH" != "i686" ]] && [[ "$BUILD_TYPE" != "CI_CROSS" ]]; then
+  cp -fr ${GIMP_PREFIX}/bin/*.pdb ${GIMP_DISTRIB}/bin/
+fi
+
 ## Optional executables, .DLLs and resources for GObject Introspection support
 if [[ "$BUILD_TYPE" != "CI_CROSS" ]]; then
   cp -fr ${MSYS_PREFIX}/bin/libgirepository-*.dll ${GIMP_DISTRIB}/bin/

meson.build

@@ -289,6 +289,13 @@ if platform_windows and cc.get_id() == 'gcc'
   compiler_args += msvc_compat_args
 endif
 
+# Generate .pdb (CodeView) debug symbols (makes possible to debug with DIA SDK)
+pdb_support = cc.has_argument('-gcodeview') and cc.has_link_argument('-Wl,--pdb=')
+if platform_windows and pdb_support
+  compiler_args += '-gcodeview'
+  linker_args += '-Wl,--pdb='
+endif
+
 
 conf.set('HAVE__NL_MEASUREMENT_MEASUREMENT',
   cc.compiles('''
@@ -2017,7 +2024,14 @@ pkgconfig.generate(libgimpui,
   ],
 )
 
-
+################################################################################
+# Install native debug data (.pdb) on Windows
+# Ideally meson should take care of it automatically.
+# See: https://github.com/mesonbuild/meson/issues/12977
+if platform_windows and pdb_support
+  install_win_debug_script = find_program('./meson_install_win_debug.sh')
+  meson.add_install_script(install_win_debug_script)
+endif
 
 ################################################################################
 # Subdir installations

meson_install_win_debug.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+find . \( -iname '*.dll' -or -iname '*.exe' \) | \
+while IFS= read -r build_bin;
+do
+  build_bin_name="${build_bin##*/}"
+  installed_bin=$(find ${MESON_INSTALL_DESTDIR_PREFIX} -iname "$build_bin_name")
+  if [ x"$installed_bin" != "x" ]; then
+    install_dir=$(dirname ${installed_bin})
+    pdb_debug=$(echo $build_bin|sed 's/\.\(dll\|exe\)$/.pdb/')
+    if [ -f "$pdb_debug" ]; then
+      # Note: meson hides script outputs anyway on success. But this can be
+      # useful when debugging.
+      echo Installing $pdb_debug to $install_dir
+      if [ -z "$MESON_INSTALL_DRY_RUN" ]; then
+        cp -f $pdb_debug $install_dir
+      fi
+    fi
+  fi
+done;