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Re: Oh dear. I regret to inform you that commit de52b9607d2623f18b7a7dbee3e1123d8d63f5da might be unfortunate

> That must be me, so I will take a look now. I think it's because
> I didn't build with --enable-targets=all.

Attached is the patch I just pushed to master.

gdb/ChangeLog:

        * amd64-darwin-tdep.c (x86_darwin_init_abi_64): Add missing
        parameter in call to amd64_target_description.
        * amd64-dicos-tdep.c (amd64_dicos_init_abi): Likewise.
        * amd64-fbsd-tdep.c (amd64fbsd_core_read_description)
        (amd64fbsd_init_abi): Likewise.
        * amd64-nbsd-tdep.c (amd64nbsd_init_abi): Likewise.
        * amd64-obsd-tdep.c (amd64obsd_init_abi): Likewise.
        * amd64-sol2-tdep.c (amd64_sol2_init_abi): Likewise.
        * amd64-fbsd-nat.c (amd64_fbsd_nat_target): Likewise.

The change to amd64-fbsd-nat.c was done "blind" (no access to system),
but is reasonably straightforward. The changes to the -tdep.c files
were verify by rebuilding GDB on x86_64-linux when configured with
--enable-targets=all.

-- 
Joel

>From 41206e32fb909ebacf6db009fc1f177bde74a652 Mon Sep 17 00:00:00 2001
From: Joel Brobecker <brobecker@adacore.com>
Date: Fri, 29 Jun 2018 18:42:27 -0400
Subject: [PATCH] fix GDB build failure for various amd64 targets

The following patch caused some amd64-*-tdep files to fail to compile:

  | commit de52b9607d2623f18b7a7dbee3e1123d8d63f5da
  | Date:   Tue Jun 26 16:33:27 2018 +0100
  | Subject: x86_64-windows GDB crash due to fs_base/gs_base registers

This is because we added one additional "segments" argument to
function amd64_target_description and forgot to update all the callers.
This patch fixes the omissions.

gdb/ChangeLog:

        * amd64-darwin-tdep.c (x86_darwin_init_abi_64): Add missing
        parameter in call to amd64_target_description.
        * amd64-dicos-tdep.c (amd64_dicos_init_abi): Likewise.
        * amd64-fbsd-tdep.c (amd64fbsd_core_read_description)
        (amd64fbsd_init_abi): Likewise.
        * amd64-nbsd-tdep.c (amd64nbsd_init_abi): Likewise.
        * amd64-obsd-tdep.c (amd64obsd_init_abi): Likewise.
        * amd64-sol2-tdep.c (amd64_sol2_init_abi): Likewise.
        * amd64-fbsd-nat.c (amd64_fbsd_nat_target): Likewise.

The change to amd64-fbsd-nat.c was done "blind" (no access to system),
but is reasonably straightforward. The changes to the -tdep.c files
were verify by rebuilding GDB on x86_64-linux when configured with
--enable-targets=all.
---
 gdb/ChangeLog           | 12 ++++++++++++
 gdb/amd64-darwin-tdep.c |  2 +-
 gdb/amd64-dicos-tdep.c  |  2 +-
 gdb/amd64-fbsd-nat.c    |  4 ++--
 gdb/amd64-fbsd-tdep.c   |  4 ++--
 gdb/amd64-nbsd-tdep.c   |  2 +-
 gdb/amd64-obsd-tdep.c   |  2 +-
 gdb/amd64-sol2-tdep.c   |  2 +-
 8 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c47c111466..e3267853d3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,15 @@
+2018-06-29  Joel Brobecker  <brobecker@adacore.com>
+
+	* amd64-darwin-tdep.c (x86_darwin_init_abi_64): Add missing
+	parameter in call to amd64_target_description.
+	* amd64-dicos-tdep.c (amd64_dicos_init_abi): Likewise.
+	* amd64-fbsd-tdep.c (amd64fbsd_core_read_description)
+	(amd64fbsd_init_abi): Likewise.
+	* amd64-nbsd-tdep.c (amd64nbsd_init_abi): Likewise.
+	* amd64-obsd-tdep.c (amd64obsd_init_abi): Likewise.
+	* amd64-sol2-tdep.c (amd64_sol2_init_abi): Likewise.
+	* amd64-fbsd-nat.c (amd64_fbsd_nat_target): Likewise.
+
 2018-06-29  Pedro Alves  <palves@redhat.com>
 
 	* gdb/amd64-tdep.h (amd64_create_target_description): Add
diff --git a/gdb/amd64-darwin-tdep.c b/gdb/amd64-darwin-tdep.c
index fe8bfab721..24d21b9f4a 100644
--- a/gdb/amd64-darwin-tdep.c
+++ b/gdb/amd64-darwin-tdep.c
@@ -100,7 +100,7 @@ x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
 
   tdep->struct_return = reg_struct_return;
 
diff --git a/gdb/amd64-dicos-tdep.c b/gdb/amd64-dicos-tdep.c
index 85861ec86e..a9af7a0461 100644
--- a/gdb/amd64-dicos-tdep.c
+++ b/gdb/amd64-dicos-tdep.c
@@ -27,7 +27,7 @@ static void
 amd64_dicos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
 
   dicos_init_abi (gdbarch);
 }
diff --git a/gdb/amd64-fbsd-nat.c b/gdb/amd64-fbsd-nat.c
index 6b0367b5d6..f9b1bcae2e 100644
--- a/gdb/amd64-fbsd-nat.c
+++ b/gdb/amd64-fbsd-nat.c
@@ -188,13 +188,13 @@ amd64_fbsd_nat_target::read_description ()
   if (x86bsd_xsave_len != 0)
     {
       if (is64)
-	return amd64_target_description (xcr0);
+	return amd64_target_description (xcr0, true);
       else
 	return i386_target_description (xcr0);
     }
 #endif
   if (is64)
-    return amd64_target_description (X86_XSTATE_SSE_MASK);
+    return amd64_target_description (X86_XSTATE_SSE_MASK, true);
   else
     return i386_target_description (X86_XSTATE_SSE_MASK);
 }
diff --git a/gdb/amd64-fbsd-tdep.c b/gdb/amd64-fbsd-tdep.c
index 9b2ee13653..f5bf1985b6 100644
--- a/gdb/amd64-fbsd-tdep.c
+++ b/gdb/amd64-fbsd-tdep.c
@@ -156,7 +156,7 @@ amd64fbsd_core_read_description (struct gdbarch *gdbarch,
 				 struct target_ops *target,
 				 bfd *abfd)
 {
-  return amd64_target_description (i386fbsd_core_read_xcr0 (abfd));
+  return amd64_target_description (i386fbsd_core_read_xcr0 (abfd), true);
 }
 
 /* Similar to amd64_supply_fpregset, but use XSAVE extended state.  */
@@ -218,7 +218,7 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->sizeof_gregset = 22 * 8;
 
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
 
   tdep->sigtramp_p = amd64fbsd_sigtramp_p;
   tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
diff --git a/gdb/amd64-nbsd-tdep.c b/gdb/amd64-nbsd-tdep.c
index f740bb4a82..d100beacd1 100644
--- a/gdb/amd64-nbsd-tdep.c
+++ b/gdb/amd64-nbsd-tdep.c
@@ -105,7 +105,7 @@ amd64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->sizeof_gregset = 26 * 8;
 
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
 
   tdep->jb_pc_offset = 7 * 8;
 
diff --git a/gdb/amd64-obsd-tdep.c b/gdb/amd64-obsd-tdep.c
index 1e078b14f8..da4739c972 100644
--- a/gdb/amd64-obsd-tdep.c
+++ b/gdb/amd64-obsd-tdep.c
@@ -421,7 +421,7 @@ amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
   obsd_init_abi (info, gdbarch);
 
   /* Initialize general-purpose register set details.  */
diff --git a/gdb/amd64-sol2-tdep.c b/gdb/amd64-sol2-tdep.c
index 78d3d361cb..9504f190d7 100644
--- a/gdb/amd64-sol2-tdep.c
+++ b/gdb/amd64-sol2-tdep.c
@@ -101,7 +101,7 @@ amd64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tdep->sizeof_gregset = 28 * 8;
 
   amd64_init_abi (info, gdbarch,
-		  amd64_target_description (X86_XSTATE_SSE_MASK));
+		  amd64_target_description (X86_XSTATE_SSE_MASK, true));
 
   tdep->sigtramp_p = amd64_sol2_sigtramp_p;
   tdep->sigcontext_addr = amd64_sol2_mcontext_addr;
-- 
2.17.1
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