[RFA] Fix gdbserver build failure on arm-android.

[Joel Brobecker <brobecker@adacore.com>]

Hello,

The following patch...

| proc-service, extern "C"
|
| libthread_db.so calls symbols in the client (GDB), through the
| proc-service interface.  These routines must have extern "C" linkage
| so their symbol names are not mangled when GDB is built as a C++
| program.  On the GDBserver side, we were missing fallback declarations for
| all these symbols.
|
| gdb/ChangeLog:
|
|     * gdb_proc_service.h: Wrap with EXTERN_C_PUSH/EXTERN_C_POP.
|
| gdb/gdbserver/ChangeLog:
| 2015-02-27  Pedro Alves  <palves@redhat.com>
|
|     * gdb_proc_service.h: Wrap with EXTERN_C_PUSH/EXTERN_C_POP.
|     [!HAVE_PROC_SERVICE_H] (struct ps_prochandle): Forward declare.
|     [!HAVE_PROC_SERVICE_H] (ps_pdread, ps_pdwrite, ps_ptread)
|     ps_ptwrite, ps_lgetregs, ps_lsetregs, ps_lgetfpregs)
|     (ps_lsetfpregs, ps_getpid)
|     (ps_get_thread_area, ps_pglobal_lookup, ps_pstop, ps_pcontinue)
|     (ps_lstop, ps_lcontinue, ps_lgetxregsize, ps_lgetxregs)
|     (ps_lsetxregs, ps_plog): Declare.

... added a number of declarations which do not compile when cross-
compiling GDBserver on arm-android. The problem comes from type
prfpregset_t not being declared:

    /[...]/gdbserver/gdb_proc_service.h:98:47:
    error: unknown type name 'prfpregset_t'

After searching through the includes of the install we have,
I could not find that type being declared anywhere. So I did
the same as for prgregset_t, and created the typedef if the
type isn't declared.

gdb/gdbserver/ChangeLog:

        * configure.ac: Add prfpregset_t BFD_HAVE_SYS_PROCFS_TYPE check.
        * configure, config.in: Regenerate.
        * gdb_proc_service.h [HAVE_PRFPREGSET_T] (prfpregset_t):
        Declare typedef.

OK to commit?

Thanks,
-- 
Joel

---
 gdb/gdbserver/config.in          |  3 +++
 gdb/gdbserver/configure          | 37 +++++++++++++++++++++++++++++++++++++
 gdb/gdbserver/configure.ac       |  1 +
 gdb/gdbserver/gdb_proc_service.h |  4 ++++
 4 files changed, 45 insertions(+)

diff --git a/gdb/gdbserver/config.in b/gdb/gdbserver/config.in
index 3c3bfca..9359ce5 100644
--- a/gdb/gdbserver/config.in
+++ b/gdb/gdbserver/config.in
@@ -164,6 +164,9 @@
 /* Define to 1 if you have the `pread64' function. */
 #undef HAVE_PREAD64
 
+/* Define if <sys/procfs.h> has prfpregset_t. */
+#undef HAVE_PRFPREGSET_T
+
 /* Define if <sys/procfs.h> has prgregset_t. */
 #undef HAVE_PRGREGSET_T
 
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index 75860dd..b5a2f85 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -6535,6 +6535,43 @@ $as_echo "#define HAVE_PRGREGSET_T 1" >>confdefs.h
  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $bfd_cv_have_sys_procfs_type_prgregset_t" >&5
 $as_echo "$bfd_cv_have_sys_procfs_type_prgregset_t" >&6; }
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for prfpregset_t in sys/procfs.h" >&5
+$as_echo_n "checking for prfpregset_t in sys/procfs.h... " >&6; }
+ if test "${bfd_cv_have_sys_procfs_type_prfpregset_t+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#define _SYSCALL32
+/* Needed for new procfs interface on sparc-solaris.  */
+#define _STRUCTURED_PROC 1
+#include <sys/procfs.h>
+int
+main ()
+{
+prfpregset_t avar
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  bfd_cv_have_sys_procfs_type_prfpregset_t=yes
+else
+  bfd_cv_have_sys_procfs_type_prfpregset_t=no
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+ if test $bfd_cv_have_sys_procfs_type_prfpregset_t = yes; then
+
+$as_echo "#define HAVE_PRFPREGSET_T 1" >>confdefs.h
+
+ fi
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $bfd_cv_have_sys_procfs_type_prfpregset_t" >&5
+$as_echo "$bfd_cv_have_sys_procfs_type_prfpregset_t" >&6; }
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for elf_fpregset_t in sys/procfs.h" >&5
 $as_echo_n "checking for elf_fpregset_t in sys/procfs.h... " >&6; }
  if test "${bfd_cv_have_sys_procfs_type_elf_fpregset_t+set}" = set; then :
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index 34af269..efbb346 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -343,6 +343,7 @@ if test "$ac_cv_header_sys_procfs_h" = yes; then
   BFD_HAVE_SYS_PROCFS_TYPE(lwpid_t)
   BFD_HAVE_SYS_PROCFS_TYPE(psaddr_t)
   BFD_HAVE_SYS_PROCFS_TYPE(prgregset_t)
+  BFD_HAVE_SYS_PROCFS_TYPE(prfpregset_t)
   BFD_HAVE_SYS_PROCFS_TYPE(elf_fpregset_t)
 fi
 
diff --git a/gdb/gdbserver/gdb_proc_service.h b/gdb/gdbserver/gdb_proc_service.h
index 2dcfa5b..cbafbf3 100644
--- a/gdb/gdbserver/gdb_proc_service.h
+++ b/gdb/gdbserver/gdb_proc_service.h
@@ -71,6 +71,10 @@ typedef void *psaddr_t;
 typedef elf_gregset_t prgregset_t;
 #endif
 
+#ifndef HAVE_PRFPREGSET_T
+typedef elf_fpregset_t prfpregset_t;
+#endif
+
 /* This type is opaque in this interface.  It's defined by the user of
    libthread_db.  GDB's version is defined below.  */
 struct ps_prochandle;
-- 
1.9.1