[PATCH] meson.build: Add --enable-pdb option

[PATCH] meson.build: Add --enable-pdb option

[Steve Aarnio]

This option will (attempt to) modify the QEMU compile and link flags to emit
PDB symbol files rather than the standard (DWARF?) symbol output from gcc/clang.
Prerequisites for this are host_os == Windows and --enable-debug flag set.

This enables using native Windows debug tools (Windbg/Visual Studio) for
debugging QEMU.

Signed-off-by: Steve Aarnio <saarnio@qti.qualcomm.com>
---
Added Mohamed's suggested change to configure.

 configure         | 3 +++
 meson.build       | 5 +++++
 meson_options.txt | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/configure b/configure
index 42c45fe47a..502a61412f 100755
--- a/configure
+++ b/configure
@@ -707,6 +707,9 @@ for opt do
       meson_option_parse --enable-debug-mutex ""
       meson_option_add -Doptimization=0
   ;;
+  --enable-pdb)
+      meson_option_add -Dpdb=true
+  ;;
   --disable-tcg) tcg="disabled"
   ;;
   --enable-tcg) tcg="enabled"
diff --git a/meson.build b/meson.build
index d7c4095b39..e6f17dd5f7 100644
--- a/meson.build
+++ b/meson.build
@@ -692,6 +692,11 @@ endif
 
 qemu_common_flags += hardening_flags
 
+if host_os == 'windows' and get_option('debug') and get_option('pdb')
+  qemu_common_flags += cc.get_supported_arguments('-g','-gcodeview','-gcolumn-info','-fno-omit-frame-pointer')
+  qemu_ldflags += cc.get_supported_link_arguments('-g','-Wl,--pdb=')
+endif
+
 # Collect warning flags we want to set, sorted alphabetically
 warn_flags = [
   # First enable interesting warnings
diff --git a/meson_options.txt b/meson_options.txt
index 31d5916cfc..bffbc7923d 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -372,6 +372,8 @@ option('debug_stack_usage', type: 'boolean', value: false,
        description: 'measure coroutine stack usage')
 option('qom_cast_debug', type: 'boolean', value: true,
        description: 'cast debugging support')
+option('pdb', type: 'boolean', value: false,
+       description: 'use pdb symbol format on Windows debug builds')
 option('slirp_smbd', type : 'feature', value : 'auto',
        description: 'use smbd (at path --smbd=*) in slirp networking')
 
-- 
2.53.0