* infrun.c (IN_SOLIB_TRAMPOLINE): Correct comment, trampolines

	are in the .plt section.
	* minsyms.c (lookup_solib_trampoline_symbol_by_pc,
	find_solib_trampoline_target):  New functions for handling
	stepping into -g compiled shared libraries.
	* symtab.h (lookup_solib_trampoline_symbol_by_pc,
	find_solib_trampoline_target):  Add prototypes.
	* config/tm-sunos.h (IN_SOLIB_TRAMPOLINE, SKIP_TRAMPOLINE_CODE):
	Define to handle stepping into  -g compiled shared libraries.
	* config/tm-sysv4.h (SKIP_TRAMPOLINE_CODE):  Define to handle
	stepping into  -g compiled shared libraries.
	* configure.in:  Add mips-*-sysv4* support.
	* config/mips/mipsv4.mh, config/mips/mipsv4.mt,
	config/mips/tm-mipsv4.h, config/mips/xm-mipsv4.h, mipsv4-nat.c:
	New files for MIPS SVR4 support.
	* Makefile.in:  Update for new mipsv4 files.
	* alpha-tdep.c (heuristic_proc_desc, find_proc_desc):  Use
	read_next_frame_reg to obtain the frame relative stack pointer.
	* mips-tdep.c (heuristic_proc_desc):  Use read_next_frame_reg to
	obtain the frame relative stack pointer.
	* mdebugread.c (parse_partial_symbols, psymtab_to_symtab1):
	Handle stStatic and stStaticProc symbols in stabs-in-ecoff output
	by entering them into the minimal symbol table.
	* printcmd.c (print_scalar_formatted):  Do not try to unpack to
	a long for float formats.
	* solib.c:  Include "elf/mips.h" only if DT_MIPS_RLD_MAP does not
	get defined in <link.h>.
	* solib.c (solib_add):  Add shared library sections to the section
	table of the target before adding the symbols.
	* partial-stab.h:  Relocate static and global functions.
	* dbxread.c (read_dbx_symtab):  Remove unused variable
	end_of_text_address.  Relocate text_addr when passing it
	to end_psymtab.

	For Alpha OSF/1 targets, enable gdb to set breakpoints in shared
	library functions before the executable is run. Retrieve dynamic
	symbols from stripped executables.
	* mipsread.c (read_alphacoff_dynamic_symtab):  New function.
	* mipsread.c (mipscoff_symfile_read):  Use it. Issue warning message
	if no debugging symbols were found.
	* alpha-tdep.c (alpha_skip_prologue):  Silently return the unaltered
	pc if memory at the pc is not accessible and GDB_TARGET_HAS_SHARED_LIBS
	is defined.
	* config/alpha/nm-alpha.h (GDB_TARGET_HAS_SHARED_LIBS):  Define,
	OSF/1 has shared libraries.

1 files changed, 27 insertions, 2 deletions

diff --git a/gdb/symtab.h b/gdb/symtab.h
index ffc2f9b..24a807a 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -26,8 +26,12 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define obstack_chunk_alloc xmalloc
 #define obstack_chunk_free free
 
-/* GNU C supports enums that are bitfields.  Some old compilers don't. */
-#if defined(__GNUC__) && !defined(BYTE_BITFIELD)
+/* Don't do this; it means that if some .o's are compiled with GNU C
+   and some are not (easy to do accidentally the way we configure
+   things; also it is a pain to have to "make clean" every time you
+   want to switch compilers), then GDB dies a horrible death.  */
+/* GNU C supports enums that are bitfields.  Some compilers don't. */
+#if 0 && defined(__GNUC__) && !defined(BYTE_BITFIELD)
 #define	BYTE_BITFIELD	:8;
 #else
 #define	BYTE_BITFIELD	/*nothing*/
@@ -57,6 +61,9 @@ struct general_symbol_info
 
   union
     {
+      /* The fact that this is a long not a LONGEST mainly limits the
+	 range of a LOC_CONST.  Since LOC_CONST_BYTES exists, I'm not
+	 sure that is a big deal.  */
       long value;
 
       struct block *block;
@@ -299,6 +306,15 @@ struct minimal_symbol
       mst_data,			/* Generally initialized data */
       mst_bss,			/* Generally uninitialized data */
       mst_abs,			/* Generally absolute (nonrelocatable) */
+      /* GDB uses mst_solib_trampoline for the start address of a shared
+	 library trampoline entry.  Breakpoints for shared library functions
+	 are put there if the shared library is not yet loaded.
+	 After the shared library is loaded, lookup_minimal_symbol will
+	 prefer the minimal symbol from the shared library (usually
+	 a mst_text symbol) over the mst_solib_trampoline symbol, and the
+	 breakpoints will be moved to their true address in the shared
+	 library via breakpoint_re_set.  */
+      mst_solib_trampoline,	/* Shared library trampoline code */
       /* For the mst_file* types, the names are only guaranteed to be unique
 	 within a given .o file.  */
       mst_file_text,		/* Static version of mst_text */
@@ -1016,6 +1032,12 @@ lookup_minimal_symbol PARAMS ((const char *, struct objfile *));
 extern struct minimal_symbol *
 lookup_minimal_symbol_by_pc PARAMS ((CORE_ADDR));
 
+extern struct minimal_symbol *
+lookup_solib_trampoline_symbol_by_pc PARAMS ((CORE_ADDR));
+
+extern CORE_ADDR
+find_solib_trampoline_target PARAMS ((CORE_ADDR));
+
 extern void
 init_minimal_symbol_collection PARAMS ((void));
 
@@ -1097,6 +1119,9 @@ maintenance_print_msymbols PARAMS ((char *, int));
 void
 maintenance_print_objfiles PARAMS ((char *, int));
 
+void
+maintenance_check_symtabs PARAMS ((char *, int));
+
 #endif
 
 extern void