add gdb-client to run on host to debug target.. (kgdb)

[openwrt.git] / toolchain / gdb / patches / 790-debian_dwarf2-cfi-warning.patch

diff --git a/toolchain/gdb/patches/790-debian_dwarf2-cfi-warning.patch b/toolchain/gdb/patches/790-debian_dwarf2-cfi-warning.patch
new file mode 100644 (file)
index 0000000..cfb3d95
--- /dev/null
+++ b/toolchain/gdb/patches/790-debian_dwarf2-cfi-warning.patch
@@ -0,0 +1,39 @@
+Status: Unsuitable for upstream (at least, without a lot of arguing).
+
+GCC does not specify the state of every last register in the CIE.  Since
+GCC's focus is on correctness of runtime unwinding, any registers which
+have to be unwound will be specified; but unmodified registers will not
+be explicitly marked.  (How about modified, call-clobbered registers?
+I'm not sure if they are marked as unavailable.)
+
+GDB issues a noisy warning about this.  The warning is generally not useful,
+and we can get it extremely frequently (any time we load a new CIE).
+
+This patch disables the warning.  Alternately we could set the complaints
+threshold to zero, or implement a default frame init-register method for
+every architecture.  But someday the compiler will support using different
+calling conventions for internal functions, so that's not much of a stopgap. 
+ARM has a complex algorithm for handling this, involving scanning all CIEs -
+benefit not completely clear outside of the ARM context of flexible register
+sets.
+
+Index: gdb-6.3/gdb/dwarf2-frame.c
+===================================================================
+--- gdb-6.3.orig/gdb/dwarf2-frame.c    2004-11-15 11:54:57.000000000 -0500
++++ gdb-6.3/gdb/dwarf2-frame.c 2004-12-08 18:02:23.896409471 -0500
+@@ -705,9 +705,12 @@ dwarf2_frame_cache (struct frame_info *n
+          table.  We need a way of iterating through all the valid
+          DWARF2 register numbers.  */
+       if (fs->regs.reg[column].how == DWARF2_FRAME_REG_UNSPECIFIED)
+-        complaint (&symfile_complaints,
+-                   "Incomplete CFI data; unspecified registers at 0x%s",
+-                   paddr (fs->pc));
++        {
++          if (0)
++            complaint (&symfile_complaints,
++                       "Incomplete CFI data; unspecified registers at 0x%s",
++                       paddr (fs->pc));
++        }
+       else
+         cache->reg[regnum] = fs->regs.reg[column];
+       }