Broken MPIR 2.6.0 on Cygwin64

[Jean-Pierre Flori <jpflori@gmail.com>]

Dear all,

First thanks a lot for your hard work on the Cygwin project and the
Cygwin64 project.


I've begun to try to build Sage (http://www.sagemath.org) on Cygwin64
to provide some Windows support without the need of a virtual machine
running Linux and now have some trouble compiling a working MPIR 2.6.0
(http://www.mpir.org) library.

Note that I have no problems building a proper static or shared
version of GMP 5.1.2 with the GCC 4.8.1 toolchain currently provided
with Cygwin64, and it passes its complete testsuite.
At some point we should be able to switch to GMP, but we still have
some dependencies relying on MPIR's internals, so we have (and want,
even in the future by default) to stick with MPIR.

Also note we have no problem using MPIR on 32 bit Cygwin.


So my problem with MPIR are as follow:

* the ./configfsf.[guess|sub] and yasm/config/config.[guess|sub] file
within the upstream tarball are too old and failed to recognize
Cygwin64, replacing them with up-to-date version easily solves that,

* I have no problem building a static lib, but running make check
fails when linking any test executable, e.g. the first one
"t-bswap.exe":
{{{
/bin/sh ../libtool --tag=CC    --mode=link gcc -std=gnu99  -m64 -O2
-march=corei7-avx -mtune=corei7-avx    -o t-bswap.exe t-bswap.o
libtests.la ../libmpir.la
libtool: link: gcc -std=gnu99 -m64 -O2 -march=corei7-avx
-mtune=corei7-avx -o t-bswap.exe t-bswap.o  ./.libs/libtests.a
/home/jp/mpir-2.6.0/.libs/libmpir.a ../.libs/libmpir.a
collect2: error: ld terminated with signal 11 [Segmentation fault], core dumped
Makefile:503: recipe for target `t-bswap.exe' failed
}}}
A 0 byte t-bswap.exe is created and the content of the stackdump is
{{{
$ cat tests/ld.exe.stackdump
Exception: STATUS_ACCESS_VIOLATION at rip=0000000003E
rax=00000001004C3FA0 rbx=000000060018DCB0 rcx=000000060018DCB0
rdx=000000060018ECA8 rsi=0000000000C2A580 rdi=0000000000000025
r8 =0000000000C2A590 r9 =00000000FFFFBFFF r10=0000000000C30000
r11=00000001004B111E r12=0000000000000001 r13=000000060018ECA9
r14=0000000100534780 r15=000000060018ECA8
rbp=0000000000C2A590 rsp=0000000000C2A528
program=C:\cygwin64\usr\x86_64-pc-cygwin\bin\ld.exe, pid 6744, thread main
cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame        Function    Args
00000C2A590  0000000003E (00000000000, 01300000001, 00100512180, 00000000000)
00000C2A590  00100493B54 (00000000000, 006000F4B30, 00000000023, 00000000000)
00000C2A650  00100433783 (00100534780, 00600057550, 001800C0C2C, 00000000000)
00000000000  0010040E82C (00600022D10, 00600023CF8, 00100436389, 00000000000)
00000000001  0010040F2E0 (001802DE300, 00600019870, 001800C0C2C, 00600017A30)
001004DDD08  001004113FB (00100520580, 00000000000, 001802E3E9D, 001802DF658)
001004DDD08  001004BF4C0 (00000C2A9B0, 00000C2AA46, 001801691B1, 00000000000)
00000C2AB80  0018004836E (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  0018004618B (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  0018004634F (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  001004BDD31 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  00100401010 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  00076B7652D (00000000000, 00000000000, 00000000000, 00076BF9300)
00000000000  0007726C521 (00000000000, 00000000000, 00000000000, 00076BF9300)
End of stack trace
}}}

* I have no problem building a shared lib, nor the test programs in
that case, but many (but not all) of them segfaults when they are run.

In the two above cases, I was not able to retrieve useful information
when attaching gdb to the segfaulting process.
I just saw that three threads were launched and the backtrace only
involved Cygwin/Windows dlls.


Did anyone among the Cygwin folk tried to build MPIR on Cygwin64 and
got more success than I had?
Or has any advice to solve these issues?


Thanks in advance for your help,
Best,

-- 
Jean-Pierre Flori

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