bvt's backtrace

To build ave1gnat for mipsel-sf, two changes for current ave1gnat are necessary. First, a built script:

$ cat build-ada-mipsel-sf.sh
BUILDDIR=build
PREFIX=$1

[ -z "$PREFIX" ] && exit 1

set -ex

./download-adacore-2016.sh

mkdir -p $BUILDDIR

cp extraconfig.sh $BUILDDIR/

cd $BUILDDIR

../extra/build-tarballs.sh "$PREFIX" musl ada x86_64 mipsel-sf

Initially I have expected that this will be enough¹. It turned out though that AdaCore source distribution is missing some files² that are necessary for building that GNAT runtime. But we can add them in a patch:

$ cat patches/gcc-4.9.adacore2016-4-mipsel.diff
diff -uaNr a/gcc/ada/s-linux-mipsel.ads b/gcc/ada/s-linux-mipsel.ads
--- a/gcc/ada/s-linux-mipsel.ads        1970-01-01 00:00:00.000000000 +0000
+++ b/gcc/ada/s-linux-mipsel.ads        2019-06-26 12:02:26.295120500 +0000
@@ -0,0 +1,126 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
+--                                                                          --
+--                          S Y S T E M .  L I N U X                        --
+--                                                                          --
+--                                  S p e c                                 --
+--                                                                          --
+--             Copyright (C) 2009-2014, Free Software Foundation, Inc.      --
+--                                                                          --
+-- GNARL is free software; you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- .                                          --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is the mipsel version of this package
+
+--  This package encapsulates cpu specific differences between implementations
+--  of GNU/Linux, in order to share s-osinte-linux.ads.
+
+--  PLEASE DO NOT add any with-clauses to this package or remove the pragma
+--  Preelaborate. This package is designed to be a bottom-level (leaf) package
+
+with Interfaces.C;
+
+package System.Linux is
+   pragma Preelaborate;
+
+   ----------
+   -- Time --
+   ----------
+
+   subtype long        is Interfaces.C.long;
+   subtype suseconds_t is Interfaces.C.long;
+   subtype time_t      is Interfaces.C.long;
+   subtype clockid_t   is Interfaces.C.int;
+
+   type timespec is record

+   EINTR     : constant := 4;
+   EINVAL    : constant := 22;
+   ENOMEM    : constant := 12;
+   EPERM     : constant := 1;
+   ETIMEDOUT : constant := 110;
+
+   -------------
+   -- Signals --
+   -------------
+
+   SIGHUP     : constant := 1; --  hangup
+   SIGINT     : constant := 2; --  interrupt (rubout)
+   SIGQUIT    : constant := 3; --  quit (ASCD FS)
+   SIGILL     : constant := 4; --  illegal instruction (not reset)
+   SIGTRAP    : constant := 5; --  trace trap (not reset)
+   SIGIOT     : constant := 6; --  IOT instruction
+   SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
+   SIGFPE     : constant := 8; --  floating point exception
+   SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
+   SIGBUS     : constant := 7; --  bus error
+   SIGSEGV    : constant := 11; --  segmentation violation
+   SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
+   SIGALRM    : constant := 14; --  alarm clock
+   SIGTERM    : constant := 15; --  software termination signal from kill
+   SIGUSR1    : constant := 10; --  user defined signal 1
+   SIGUSR2    : constant := 12; --  user defined signal 2
+   SIGCLD     : constant := 17; --  alias for SIGCHLD
+   SIGCHLD    : constant := 17; --  child status change
+   SIGPWR     : constant := 30; --  power-fail restart
+   SIGWINCH   : constant := 28; --  window size change
+   SIGURG     : constant := 23; --  urgent condition on IO channel
+   SIGPOLL    : constant := 29; --  pollable event occurred
+   SIGIO      : constant := 29; --  I/O now possible (4.2 BSD)
+   SIGLOST    : constant := 29; --  File lock lost
+   SIGSTOP    : constant := 19; --  stop (cannot be caught or ignored)
+   SIGTSTP    : constant := 20; --  user stop requested from tty
+   SIGCONT    : constant := 18; --  stopped process has been continued
+   SIGTTIN    : constant := 21; --  background tty read attempted
+   SIGTTOU    : constant := 22; --  background tty write attempted
+   SIGVTALRM  : constant := 26; --  virtual timer expired
+   SIGPROF    : constant := 27; --  profiling timer expired
+   SIGXCPU    : constant := 24; --  CPU time limit exceeded
+   SIGXFSZ    : constant := 25; --  filesize limit exceeded
+   SIGUNUSED  : constant := 31; --  unused signal (GNU/Linux)
+   SIGSTKFLT  : constant := 16; --  coprocessor stack fault (Linux)
+   SIGLTHRRES : constant := 32; --  GNU/LinuxThreads restart signal
+   SIGLTHRCAN : constant := 33; --  GNU/LinuxThreads cancel signal
+   SIGLTHRDBG : constant := 34; --  GNU/LinuxThreads debugger signal
+
+   --  struct_sigaction offsets
+
+   sa_handler_pos : constant := Standard'Address_Size / 8;
+   sa_mask_pos    : constant := 2 * Standard'Address_Size / 8;
+   sa_flags_pos   : constant := 0;
+
+   SA_SIGINFO  : constant := 16#04#;
+   SA_ONSTACK  : constant := 16#08000000#;
+
+end System.Linux;
\ No newline at end of file
diff -uaNr a/gcc/ada/system-linux-mipsel.ads b/gcc/ada/system-linux-mipsel.ads
--- a/gcc/ada/system-linux-mipsel.ads   1970-01-01 00:00:00.000000000 +0000
+++ b/gcc/ada/system-linux-mipsel.ads   2019-06-26 12:02:48.701118640 +0000
@@ -0,0 +1,147 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                        GNAT RUN-TIME COMPONENTS                          --
+--                                                                          --
+--                               S Y S T E M                                --
+--                                                                          --
+--                                 S p e c
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- .                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+package System is
+   pragma Pure;
+   --  Note that we take advantage of the implementation permission to make
+   --  this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
+   --  2005, this is Pure in any case (AI-362).
+
+   pragma No_Elaboration_Code_All;
+   --  Allow the use of that restriction in units that WITH this unit
+
+   type Name is (SYSTEM_NAME_GNAT);
+   System_Name : constant Name := SYSTEM_NAME_GNAT;
+
+   --  System-Dependent Named Numbers
+
+   Min_Int               : constant := Long_Long_Integer'First;
+   Max_Int               : constant := Long_Long_Integer'Last;
+
+   Max_Binary_Modulus    : constant := 2 ** Long_Long_Integer'Size;
+   Max_Nonbinary_Modulus : constant := Integer'Last;
+
+   Max_Base_Digits       : constant := Long_Long_Float'Digits;
+   Max_Digits            : constant := Long_Long_Float'Digits;
+
+   Max_Mantissa          : constant := 63;
+   Fine_Delta            : constant := 2.0 ** (-Max_Mantissa);
+
+   Tick                  : constant := 0.000_001;
+
+   --  Storage-related Declarations
+
+   type Address is private;
+   pragma Preelaborable_Initialization (Address);
+   Null_Address : constant Address;
+
+   Storage_Unit : constant := 8;
+   Word_Size    : constant := 32;
+   Memory_Size  : constant := 2 ** 32;
+
+   --  Address comparison
+
+   function "<"  (Left, Right : Address) return Boolean;
+   function "<=" (Left, Right : Address) return Boolean;
+   function ">"  (Left, Right : Address) return Boolean;
+   function ">=" (Left, Right : Address) return Boolean;
+   function "="  (Left, Right : Address) return Boolean;
+
+   pragma Import (Intrinsic, "<");
+   pragma Import (Intrinsic, "<=");
+   pragma Import (Intrinsic, ">");
+   pragma Import (Intrinsic, ">=");
+   pragma Import (Intrinsic, "=");
+
+   --  Other System-Dependent Declarations
+
+   type Bit_Order is (High_Order_First, Low_Order_First);
+   Default_Bit_Order : constant Bit_Order := Low_Order_First;
+   pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
+
+   --  Priority-related Declarations (RM D.1)
+
+   Max_Priority           : constant Positive := 30;
+   Max_Interrupt_Priority : constant Positive := 31;
+
+   subtype Any_Priority       is Integer      range  0 .. 31;
+   subtype Priority           is Any_Priority range  0 .. 30;
+   subtype Interrupt_Priority is Any_Priority range 31 .. 31;
+
+   Default_Priority : constant Priority := 15;
+
+private
+
+   type Address is mod Memory_Size;
+   Null_Address : constant Address := 0;
+
+   --------------------------------------
+   -- System Implementation Parameters --
+   --------------------------------------
+
+   --  These parameters provide information about the target that is used
+   --  by the compiler. They are in the private part of System, where they
+   --  can be accessed using the special circuitry in the Targparm unit
+   --  whose source should be consulted for more detailed descriptions
+   --  of the individual switch values.
+
+   Backend_Divide_Checks     : constant Boolean := False;
+   Backend_Overflow_Checks   : constant Boolean := True;
+   Command_Line_Args         : constant Boolean := True;
+   Configurable_Run_Time     : constant Boolean := False;
+   Denorm                    : constant Boolean := True;
+   Duration_32_Bits          : constant Boolean := False;
+   Exit_Status_Supported     : constant Boolean := True;
+   Fractional_Fixed_Ops      : constant Boolean := False;
+   Frontend_Layout           : constant Boolean := False;
+   Machine_Overflows         : constant Boolean := False;
+   Machine_Rounds            : constant Boolean := True;
+   Preallocated_Stacks       : constant Boolean := False;
+   Signed_Zeros              : constant Boolean := True;
+   Stack_Check_Default       : constant Boolean := False;
+   Stack_Check_Probes        : constant Boolean := True;
+   Stack_Check_Limits        : constant Boolean := False;
+   Support_Aggregates        : constant Boolean := True;
+   Support_Composite_Assign  : constant Boolean := True;
+   Support_Composite_Compare : constant Boolean := True;
+   Support_Long_Shifts       : constant Boolean := True;
+   Always_Compatible_Rep     : constant Boolean := False;
+   Suppress_Standard_Library : constant Boolean := False;
+   Use_Ada_Main_Program_Name : constant Boolean := False;
+   Frontend_Exceptions       : constant Boolean := False;
+   ZCX_By_Default            : constant Boolean := True;
+
+end System;
\ No newline at end of file

1. It was indeed enough to build ave1gnat for i386. [↩]
2. Available in FSF GNAT, though. [↩]