Hi Corinna,
as mention some time ago, testing netcdf 4.4.0 release candidates
I see a puzzling SIGSEGV before reaching main, so something goes wrong
on cygwin loading/inizialization of the program.
It happens in a simple test programs that is linked to
cygnetcdf-7.dll and its only job is to create a test file
called ctest0.nc.
Previous 4.3.3.1 test case runs fine.
The new ctest.c fails both with the new and with the old library.
Test case and binaries are here :
http://matzeri.altervista.org/works/segfault/
$ gcc ctest.c -o ctest.exe -lnetcdf
$ gdb ./ctest.exe
(gdb) break main
Breakpoint 1 at 0x100401171
(gdb) run
Starting program: /cygdrive/e/cyg_pub/devel/netcdf/tests/ctest-440.exe
[New Thread 8404.0x18f4]
[New Thread 8404.0xa8c]
[New Thread 8404.0x2270]
Program received signal SIGSEGV, Segmentation fault.
___chkstk_ms () at
/usr/src/debug/gcc-4.9.3-1/libgcc/config/i386/cygwin.S:146
146 orq $0x0, (%rcx) /* probe there */
$ uname -svrm
CYGWIN_NT-6.1 2.2.1(0.289/5/3) 2015-08-20 11:42 x86_64
libnetcdf-devel 4.3.3.1-2
libnetcdf7 4.3.3.1-2
netcdf 4.3.3.1-2
netcdf-debuginfo 4.3.3.1-2
Unfortunately I have no clue about this code:
/* ___chkstk_ms is a *special* function call, which uses %rax as the
argument.
We avoid clobbering any registers. Unlike ___chkstk, it just probes the
stack and does no stack allocation. */
.global ___chkstk_ms
#ifdef __x86_64__
cfi_startproc()
___chkstk_ms:
pushq %rcx /* save temps */
cfi_push(%rcx)
pushq %rax
cfi_push(%rax)
cmpq $0x1000, %rax /* > 4k ?*/
leaq 24(%rsp), %rcx /* point past return addr */
jb 2f
1: subq $0x1000, %rcx /* yes, move pointer down 4k */
orq $0x0, (%rcx) /* probe there */
Any help will be really appreciated.
Regards
Marco
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