Fix gdb C++ compilation on Solaris (PR build/20712)

gdb 7.12 doesn't compile as C++ (tried with g++ 4.9) on Solaris (tried
10 and 12, sparc and x86).  The following patch (relative to the 7.12
release, though I expect most if not all issues to be present on trunk,
too) fixes this.

Only a few of the changes bear explanation:

* Initially, compilation failed whereever defs.h. was included:

In file included from /vol/src/gnu/gdb/gdb-7.12/gdb/gdb.c:19:0:
/vol/src/gnu/gdb/gdb-7.12/gdb/defs.h:630:33: error: 'double atof(const char*)' conflicts with a previous declaration
 extern double atof (const char *); /* X3.159-1989  4.10.1.1 */
                                 ^
In file included from /usr/include/stdlib.h:17:0,
                 from build-gnulib/import/stdlib.h:36,
                 from /vol/src/gnu/gdb/gdb-7.12/gdb/common/common-defs.h:32,
                 from /vol/src/gnu/gdb/gdb-7.12/gdb/defs.h:28,
                 from /vol/src/gnu/gdb/gdb-7.12/gdb/gdb.c:19:
/vol/gcc-4.9/lib/gcc/i386-pc-solaris2.10/4.9.0/include-fixed/iso/stdlib_iso.h:119:15: note: previous declaration 'double std::atof(const char*)'
 extern double atof(const char *);
               ^

  This is due to this gem in gdb/defs.h which seems to have been present
  like forever:

#ifndef atof
extern double atof (const char *);	/* X3.159-1989  4.10.1.1 */
#endif

  In the Solaris headers, the appropriate functions are in namespace std,
  thus the conflict.  I've wrapped the defs.h declaration in !__cplusplus
  to avoid this; perhaps it can go completely instead.

* All the casts are necessary to appease g++ and should be pretty
  obvious.

* The sol-thread.c changes are here to handle

/vol/src/gnu/gdb/gdb-7.12/gdb/sol-thread.c: In function 'void _initialize_sol_thread()':
/vol/src/gnu/gdb/gdb-7.12/gdb/sol-thread.c:1252:36: error: invalid conversion from 'void*' to 'void (*)(int)' [-fpermissive]
   if (!(p_##X = dlsym (dlhandle, #X))) \
                                    ^
/vol/src/gnu/gdb/gdb-7.12/gdb/sol-thread.c:1255:3: note: in expansion of macro 'resolve'
   resolve (td_log);
   ^

  and are modeled after linux-thread-db.c (try_thread_db_load_1).

The patch allowed both 32 and 64-bit C++ builds on sparc-sun-solaris2.10
and i386-pc-solaris2.10 to complete.  The resulting binary hasn't seen
more than a smoke test (invoke it on itself, b main, run) yet.

When investigating the failure to detect -static-libstdc++
support (more below), I found two more issues which only show up with
-Werror:

/vol/src/gnu/gdb/gdb/local/gdb/procfs.c: In function 'ssd* proc_get_LDT_entry(procinfo*, int)':
/vol/src/gnu/gdb/gdb/local/gdb/procfs.c:2487:19: error: variable 'old_chain' set but not used [-Werror=unused-but-set-variable]
   struct cleanup *old_chain = NULL;
                   ^

Unless I'm mistaken, you need to run do_cleanups on every return from
the function.

Afterwards, I ran a 32-bit compilation, which (after adding
--disable-largefile to avoid

In file included from /usr/include/sys/procfs.h:28:0,
                 from /vol/src/gnu/gdb/gdb/local/gdb/i386-sol2-nat.c:23:
/usr/include/sys/old_procfs.h:39:2: error: #error "Cannot use procfs in the large file compilation environment"
 #error "Cannot use procfs in the large file compilation environment"
  ^

and two more instances) revealed

/vol/src/gnu/gdb/gdb/local/gdb/top.c: In function 'void gdb_safe_append_history()':
/vol/src/gnu/gdb/gdb/local/gdb/top.c:1170:59: error: format '%d' expects argument of type 'int', but argument 3 has type 'pid_t {aka long int}' [-Werror=format=]
     = xstrprintf ("%s-gdb%d~", history_filename, getpid ());
                                                           ^

Fixed by casting pid_t to long and printing it as such.

5 files changed, 127 insertions, 71 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1f588217e8..10d686618f 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,38 @@
+2016-10-25  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR build/20712
+	* defs.h: Remove obsolete comment
+	(atof): Remove.
+	* procfs.c (do_destroy_procinfo_cleanup): Add cast.
+	(sysset_t_alloc): Likewise.
+	(proc_set_traced_sysentry): Likewise.
+	(proc_set_traced_sysexit): Likewise.
+	[!PIOCLSTATUS && NEW_PROC_API] (do_closedir_cleanup): Likewise.
+	(proc_get_LDT_entry): Initiate cleanups before returns.
+	(procfs_wait): Use GDB_SIGNAL_0.
+	(procfs_corefile_thread_callback): Add cast.
+	* sol-thread.c (td_log_ftype, td_ta_new_ftype, td_ta_delete_ftype)
+	(td_init_ftype, td_ta_get_ph_ftype, td_ta_get_nthreads_ftype)
+	(td_ta_tsd_iter_ftype, td_ta_thr_iter_ftype)
+	(td_thr_validate_ftype, td_thr_tsd_ftype, td_thr_get_info_ftype)
+	(td_thr_getfpregs_ftype, td_thr_getxregsize_ftype)
+	(td_thr_getxregs_ftype, td_thr_sigsetmask_ftype)
+	(td_thr_setprio_ftype, td_thr_setsigpending_ftype)
+	(td_thr_setfpregs_ftype, td_thr_setxregs_ftype)
+	(td_ta_map_id2thr_ftype, td_ta_map_lwp2thr_ftype)
+	(td_thr_getgregs_ftype, td_thr_setgregs_ftype): New typedefs.
+	(p_td_log, p_td_ta_new, p_td_ta_delete, p_td_init, p_td_ta_get_ph)
+	(p_td_ta_get_nthreads, p_td_ta_tsd_iter, p_td_ta_thr_iter)
+	(p_td_thr_validate, p_td_thr_tsd, p_td_thr_get_info)
+	(p_td_thr_getfpregs, p_td_thr_getxregsize, p_td_thr_getxregs)
+	(p_td_thr_sigsetmask, p_td_thr_setprio, p_td_thr_setsigpending)
+	(p_td_thr_setfpregs, p_td_thr_setxregs, p_td_ta_map_id2thr)
+	(p_td_ta_map_lwp2thr, p_td_thr_getgregs, p_td_thr_setgregs): Use them.
+	(ps_pdread): Add cast.
+	(ps_ptread): Likewise.
+	(resolve): Likewise.
+	* top.c (gdb_safe_append_history): Print pid_t as long.
+
 2016-10-25  Pedro Alves  <palves@redhat.com>
 
 	* common/common-defs.h (__STDC_FORMAT_MACROS): Define.
diff --git a/gdb/defs.h b/gdb/defs.h
index 5322648b26..1e595d3eea 100644
--- a/gdb/defs.h
+++ b/gdb/defs.h
@@ -612,16 +612,6 @@ enum gdb_osabi
   GDB_OSABI_INVALID		/* keep this last */
 };
 
-/* Global functions from other, non-gdb GNU thingies.
-   Libiberty thingies are no longer declared here.  We include libiberty.h
-   above, instead.  */
-
-/* From other system libraries */
-
-#ifndef atof
-extern double atof (const char *);	/* X3.159-1989  4.10.1.1 */
-#endif
-
 /* Enumerate the requirements a symbol has in order to be evaluated.
    These are listed in order of "strength" -- a later entry subsumes
    earlier ones.  This fine-grained distinction is important because
diff --git a/gdb/procfs.c b/gdb/procfs.c
index fab15edccc..ff814ba63e 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -791,7 +791,7 @@ destroy_procinfo (procinfo *pi)
 static void
 do_destroy_procinfo_cleanup (void *pi)
 {
-  destroy_procinfo (pi);
+  destroy_procinfo ((procinfo *) pi);
 }
 
 enum { NOKILL, KILL };
@@ -845,7 +845,7 @@ sysset_t_alloc (procinfo * pi)
   sysset_t *ret;
   int size = sysset_t_size (pi);
 
-  ret = xmalloc (size);
+  ret = (sysset_t *) xmalloc (size);
 #ifdef DYNAMIC_SYSCALLS
   ret->pr_size = ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
 		  / (8 * sizeof (uint64_t)));
@@ -1675,7 +1675,7 @@ proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset)
 		  - sizeof (sysset_t)
 		  + sysset_t_size (pi);
 
-    argp = xmalloc (argp_size);
+    argp = (struct gdb_proc_ctl_pcsentry *) xmalloc (argp_size);
 
     argp->cmd = PCSENTRY;
     memcpy (&argp->sysset, sysset, sysset_t_size (pi));
@@ -1720,7 +1720,7 @@ proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset)
 		  - sizeof (sysset_t)
 		  + sysset_t_size (pi);
 
-    argp = xmalloc (argp_size);
+    argp = (struct gdb_proc_ctl_pcsexit *) xmalloc (argp_size);
 
     argp->cmd = PCSEXIT;
     memcpy (&argp->sysset, sysset, sysset_t_size (pi));
@@ -2512,9 +2512,13 @@ proc_get_LDT_entry (procinfo *pi, int key)
 	break;	/* end of table */
       /* If key matches, return this entry.  */
       if (ldt_entry->sel == key)
-	return ldt_entry;
+	{
+	  do_cleanups (old_chain);
+	  return ldt_entry;
+	}
     }
   /* Loop ended, match not found.  */
+  do_cleanups (old_chain);
   return NULL;
 #else
   int nldt, i;
@@ -2756,7 +2760,7 @@ proc_update_threads (procinfo *pi)
 static void
 do_closedir_cleanup (void *dir)
 {
-  closedir (dir);
+  closedir ((DIR *) dir);
 }
 
 static int
@@ -3836,7 +3840,7 @@ wait_again:
 		      add_thread (temp_ptid);
 
 		    status->kind = TARGET_WAITKIND_STOPPED;
-		    status->value.sig = 0;
+		    status->value.sig = GDB_SIGNAL_0;
 		    return retval;
 		  }
 #endif
@@ -4567,7 +4571,7 @@ procfs_create_inferior (struct target_ops *ops, char *exec_file,
       if (path == NULL)
 	path = "/bin:/usr/bin";
 
-      tryname = alloca (strlen (path) + strlen (shell_file) + 2);
+      tryname = (char *) alloca (strlen (path) + strlen (shell_file) + 2);
       for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
 	{
 	  p1 = strchr (p, ':');
@@ -5367,7 +5371,8 @@ struct procfs_corefile_thread_data {
 static int
 procfs_corefile_thread_callback (procinfo *pi, procinfo *thread, void *data)
 {
-  struct procfs_corefile_thread_data *args = data;
+  struct procfs_corefile_thread_data *args
+    = (struct procfs_corefile_thread_data *) data;
 
   if (pi != NULL)
     {
diff --git a/gdb/sol-thread.c b/gdb/sol-thread.c
index 000d223169..85bf3ff6f1 100644
--- a/gdb/sol-thread.c
+++ b/gdb/sol-thread.c
@@ -98,56 +98,82 @@ static void init_sol_thread_ops (void);
 /* Default definitions: These must be defined in tm.h if they are to
    be shared with a process module such as procfs.  */
 
+/* Types of the libthread_db functions.  */
+
+typedef void (td_log_ftype)(const int on_off);
+typedef td_err_e (td_ta_new_ftype)(const struct ps_prochandle *ph_p,
+				   td_thragent_t **ta_pp);
+typedef td_err_e (td_ta_delete_ftype)(td_thragent_t *ta_p);
+typedef td_err_e (td_init_ftype)(void);
+typedef td_err_e (td_ta_get_ph_ftype)(const td_thragent_t *ta_p,
+				      struct ps_prochandle **ph_pp);
+typedef td_err_e (td_ta_get_nthreads_ftype)(const td_thragent_t *ta_p,
+					    int *nthread_p);
+typedef td_err_e (td_ta_tsd_iter_ftype)(const td_thragent_t *ta_p,
+					td_key_iter_f *cb, void *cbdata_p);
+typedef td_err_e (td_ta_thr_iter_ftype)(const td_thragent_t *ta_p,
+					td_thr_iter_f *cb, void *cbdata_p,
+					td_thr_state_e state, int ti_pri,
+					sigset_t *ti_sigmask_p,
+					unsigned ti_user_flags);
+typedef td_err_e (td_thr_validate_ftype)(const td_thrhandle_t *th_p);
+typedef td_err_e (td_thr_tsd_ftype)(const td_thrhandle_t * th_p,
+				    const thread_key_t key, void **data_pp);
+typedef td_err_e (td_thr_get_info_ftype)(const td_thrhandle_t *th_p,
+					 td_thrinfo_t *ti_p);
+typedef td_err_e (td_thr_getfpregs_ftype)(const td_thrhandle_t *th_p,
+					  prfpregset_t *fpregset);
+typedef td_err_e (td_thr_getxregsize_ftype)(const td_thrhandle_t *th_p,
+					    int *xregsize);
+typedef td_err_e (td_thr_getxregs_ftype)(const td_thrhandle_t *th_p,
+					 const caddr_t xregset);
+typedef td_err_e (td_thr_sigsetmask_ftype)(const td_thrhandle_t *th_p,
+					   const sigset_t ti_sigmask);
+typedef td_err_e (td_thr_setprio_ftype)(const td_thrhandle_t *th_p,
+					const int ti_pri);
+typedef td_err_e (td_thr_setsigpending_ftype)(const td_thrhandle_t *th_p,
+					      const uchar_t ti_pending_flag,
+					      const sigset_t ti_pending);
+typedef td_err_e (td_thr_setfpregs_ftype)(const td_thrhandle_t *th_p,
+					  const prfpregset_t *fpregset);
+typedef td_err_e (td_thr_setxregs_ftype)(const td_thrhandle_t *th_p,
+					 const caddr_t xregset);
+typedef td_err_e (td_ta_map_id2thr_ftype)(const td_thragent_t *ta_p,
+					  thread_t tid,
+					  td_thrhandle_t *th_p);
+typedef td_err_e (td_ta_map_lwp2thr_ftype)(const td_thragent_t *ta_p,
+					   lwpid_t lwpid,
+					   td_thrhandle_t *th_p);
+typedef td_err_e (td_thr_getgregs_ftype)(const td_thrhandle_t *th_p,
+					 prgregset_t regset);
+typedef td_err_e (td_thr_setgregs_ftype)(const td_thrhandle_t *th_p,
+					 const prgregset_t regset);
+
 /* Pointers to routines from libthread_db resolved by dlopen().  */
 
-static void (*p_td_log)(const int on_off);
-static td_err_e (*p_td_ta_new)(const struct ps_prochandle *ph_p,
-			       td_thragent_t **ta_pp);
-static td_err_e (*p_td_ta_delete)(td_thragent_t *ta_p);
-static td_err_e (*p_td_init)(void);
-static td_err_e (*p_td_ta_get_ph)(const td_thragent_t *ta_p,
-				  struct ps_prochandle **ph_pp);
-static td_err_e (*p_td_ta_get_nthreads)(const td_thragent_t *ta_p,
-					int *nthread_p);
-static td_err_e (*p_td_ta_tsd_iter)(const td_thragent_t *ta_p,
-				    td_key_iter_f *cb, void *cbdata_p);
-static td_err_e (*p_td_ta_thr_iter)(const td_thragent_t *ta_p,
-				    td_thr_iter_f *cb, void *cbdata_p,
-				    td_thr_state_e state, int ti_pri,
-				    sigset_t *ti_sigmask_p,
-				    unsigned ti_user_flags);
-static td_err_e (*p_td_thr_validate)(const td_thrhandle_t *th_p);
-static td_err_e (*p_td_thr_tsd)(const td_thrhandle_t * th_p,
-				const thread_key_t key, void **data_pp);
-static td_err_e (*p_td_thr_get_info)(const td_thrhandle_t *th_p,
-				     td_thrinfo_t *ti_p);
-static td_err_e (*p_td_thr_getfpregs)(const td_thrhandle_t *th_p,
-				      prfpregset_t *fpregset);
-static td_err_e (*p_td_thr_getxregsize)(const td_thrhandle_t *th_p,
-					int *xregsize);
-static td_err_e (*p_td_thr_getxregs)(const td_thrhandle_t *th_p,
-				     const caddr_t xregset);
-static td_err_e (*p_td_thr_sigsetmask)(const td_thrhandle_t *th_p,
-				       const sigset_t ti_sigmask);
-static td_err_e (*p_td_thr_setprio)(const td_thrhandle_t *th_p,
-				    const int ti_pri);
-static td_err_e (*p_td_thr_setsigpending)(const td_thrhandle_t *th_p,
-					  const uchar_t ti_pending_flag,
-					  const sigset_t ti_pending);
-static td_err_e (*p_td_thr_setfpregs)(const td_thrhandle_t *th_p,
-				      const prfpregset_t *fpregset);
-static td_err_e (*p_td_thr_setxregs)(const td_thrhandle_t *th_p,
-				     const caddr_t xregset);
-static td_err_e (*p_td_ta_map_id2thr)(const td_thragent_t *ta_p,
-				      thread_t tid,
-				      td_thrhandle_t *th_p);
-static td_err_e (*p_td_ta_map_lwp2thr)(const td_thragent_t *ta_p,
-				       lwpid_t lwpid,
-				       td_thrhandle_t *th_p);
-static td_err_e (*p_td_thr_getgregs)(const td_thrhandle_t *th_p,
-				     prgregset_t regset);
-static td_err_e (*p_td_thr_setgregs)(const td_thrhandle_t *th_p,
-				     const prgregset_t regset);
+static td_log_ftype *p_td_log;
+static td_ta_new_ftype *p_td_ta_new;
+static td_ta_delete_ftype *p_td_ta_delete;
+static td_init_ftype *p_td_init;
+static td_ta_get_ph_ftype *p_td_ta_get_ph;
+static td_ta_get_nthreads_ftype *p_td_ta_get_nthreads;
+static td_ta_tsd_iter_ftype *p_td_ta_tsd_iter;
+static td_ta_thr_iter_ftype *p_td_ta_thr_iter;
+static td_thr_validate_ftype *p_td_thr_validate;
+static td_thr_tsd_ftype *p_td_thr_tsd;
+static td_thr_get_info_ftype *p_td_thr_get_info;
+static td_thr_getfpregs_ftype *p_td_thr_getfpregs;
+static td_thr_getxregsize_ftype *p_td_thr_getxregsize;
+static td_thr_getxregs_ftype *p_td_thr_getxregs;
+static td_thr_sigsetmask_ftype *p_td_thr_sigsetmask;
+static td_thr_setprio_ftype *p_td_thr_setprio;
+static td_thr_setsigpending_ftype *p_td_thr_setsigpending;
+static td_thr_setfpregs_ftype *p_td_thr_setfpregs;
+static td_thr_setxregs_ftype *p_td_thr_setxregs;
+static td_ta_map_id2thr_ftype *p_td_ta_map_id2thr;
+static td_ta_map_lwp2thr_ftype *p_td_ta_map_lwp2thr;
+static td_thr_getgregs_ftype *p_td_thr_getgregs;
+static td_thr_setgregs_ftype *p_td_thr_setgregs;
 
 
 /* Return the libthread_db error string associated with ERRCODE.  If
@@ -818,7 +844,7 @@ ps_err_e
 ps_pdread (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
 	   gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 {
-  return rw_common (0, ph, addr, buf, size);
+  return rw_common (0, ph, addr, (gdb_byte *) buf, size);
 }
 
 /* Copies SIZE bytes from debugger memory .data segment to target process.  */
@@ -836,7 +862,7 @@ ps_err_e
 ps_ptread (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
 	   gdb_ps_read_buf_t buf, gdb_ps_size_t size)
 {
-  return rw_common (0, ph, addr, buf, size);
+  return rw_common (0, ph, addr, (gdb_byte *) buf, size);
 }
 
 /* Copies SIZE bytes from debugger memory .text segment to target process.  */
@@ -1249,7 +1275,7 @@ _initialize_sol_thread (void)
     goto die;
 
 #define resolve(X) \
-  if (!(p_##X = dlsym (dlhandle, #X))) \
+  if (!(p_##X = (X ## _ftype *) dlsym (dlhandle, #X)))	\
     goto die;
 
   resolve (td_log);
diff --git a/gdb/top.c b/gdb/top.c
index c84feaf6ca..c7a9c21634 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -1166,7 +1166,7 @@ gdb_safe_append_history (void)
   struct cleanup *old_chain;
 
   local_history_filename
-    = xstrprintf ("%s-gdb%d~", history_filename, getpid ());
+    = xstrprintf ("%s-gdb%ld~", history_filename, (long) getpid ());
   old_chain = make_cleanup (xfree, local_history_filename);
 
   ret = rename (history_filename, local_history_filename);