[PATCH v3 21/24] gdbstub: only compile gdbstub twice for whole build

["Alex Bennée" <alex.bennee@linaro.org>]

Now we have removed any target specific bits from the core gdbstub
code we only need to build it twice. We have to jump a few meson hoops
to manually define the CONFIG_USER_ONLY symbol but it seems to work.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v3
  - also include user and softmmu bits in the library
---
 gdbstub/gdbstub.c     |  3 +--
 gdbstub/user-target.c |  2 +-
 gdbstub/meson.build   | 32 ++++++++++++++++++++++++++------
 3 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index a8b321710c..791cb79bf6 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -39,7 +39,6 @@
 
 #include "sysemu/hw_accel.h"
 #include "sysemu/runstate.h"
-#include "exec/exec-all.h"
 #include "exec/tb-flush.h"
 #include "exec/hwaddr.h"
 #include "sysemu/replay.h"
@@ -1611,7 +1610,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
         .cmd_startswith = 1,
         .schema = "s:l,l0"
     },
-#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)
+#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX)
     {
         .handler = gdb_handle_query_xfer_auxv,
         .cmd = "Xfer:auxv:read::",
diff --git a/gdbstub/user-target.c b/gdbstub/user-target.c
index e1d9650c1e..a0c10d6e12 100644
--- a/gdbstub/user-target.c
+++ b/gdbstub/user-target.c
@@ -233,7 +233,7 @@ static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
 }
 
 
-#if defined(CONFIG_LINUX_USER)
+#if defined(CONFIG_LINUX)
 void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx)
 {
     TaskState *ts;
diff --git a/gdbstub/meson.build b/gdbstub/meson.build
index 56c40c25ef..6abf067afc 100644
--- a/gdbstub/meson.build
+++ b/gdbstub/meson.build
@@ -4,13 +4,33 @@
 # types such as hwaddr.
 #
 
-specific_ss.add(files('gdbstub.c'))
+# We need to build the core gdb code via a library to be able to tweak
+# cflags so:
+
+gdb_user_ss = ss.source_set()
+gdb_softmmu_ss = ss.source_set()
+
+# We build two versions of gdbstub, one for each mode
+gdb_user_ss.add(files('gdbstub.c', 'user.c'))
+gdb_softmmu_ss.add(files('gdbstub.c', 'softmmu.c'))
+
+gdb_user_ss = gdb_user_ss.apply(config_host, strict: false)
+gdb_softmmu_ss = gdb_softmmu_ss.apply(config_host, strict: false)
+
+libgdb_user = static_library('gdb_user', gdb_user_ss.sources(),
+                             name_suffix: 'fa',
+                             c_args: '-DCONFIG_USER_ONLY')
+
+libgdb_softmmu = static_library('gdb_softmmu', gdb_softmmu_ss.sources(),
+                                name_suffix: 'fa')
+
+gdb_user = declare_dependency(link_whole: libgdb_user)
+user_ss.add(gdb_user)
+gdb_softmmu = declare_dependency(link_whole: libgdb_softmmu)
+softmmu_ss.add(gdb_softmmu)
 
 # These have to built to the target ABI
 specific_ss.add(files('syscalls.c'))
 
-softmmu_ss.add(files('softmmu.c'))
-user_ss.add(files('user.c'))
-
-# and BSD?
-specific_ss.add(when: 'CONFIG_LINUX_USER', if_true: files('user-target.c'))
+# The user-target is specialised by the guest
+specific_ss.add(when: 'CONFIG_USER_ONLY', if_true: files('user-target.c'))
-- 
2.39.1