I have implemented a CMake way of handling this issue in the 1_8_cmake branch
of
the hdf5 svn repository.
In the root CMakeFiles.txt file I added an "include UserMacros.cmake" command
that
will load in an option and macro to change the flags to allow the use of /MT on
windows. I also modified all the CMake code to enable a hook into the compile
and link
processes.
The root UserMacros.cmake file is a placeholder for user-defined CMake code.
The
cmake code for the MT option is in the config/cmake folder under a new
UserMacros
folder in the file Windows_MT.cmake. Simply copy the contents of the
Windows_MT.cmake file to the contents of the root UserMacros.cmake file, and
enable
the option.
We would appreciate folks testing this out before we commit to the 1_8 branch.
Allen
On Monday, June 10, 2013 05:58:18 PM Dana Robinson wrote:
Hi all,
I stand corrected.
I just created a test project and inspected the assembler for the output and it
turns
out that the CRT does share state when statically linked together.
For example, this is what I get when I create a static library that calls free
via a library
function:
foo_free:
0000000000000040: 48 89 4C 24 08 mov qword ptr [rsp+8],rcx
0000000000000045: 57 push rdi
0000000000000046: 48 83 EC 20 sub rsp,20h
000000000000004A: 48 8B FC mov rdi,rsp
000000000000004D: B9 08 00 00 00 mov ecx,8
0000000000000052: B8 CC CC CC CC mov eax,0CCCCCCCCh
0000000000000057: F3 AB rep stos dword ptr [rdi]
0000000000000059: 48 8B 4C 24 30 mov rcx,qword ptr [rsp+30h]
000000000000005E: 48 8B 4C 24 30 mov rcx,qword ptr [rsp+30h]
*0000000000000063: E8 00 00 00 00 call free*
0000000000000068: 48 83 C4 20 add rsp,20h
000000000000006C: 5F pop rdi
000000000000006D: C3 ret
It clearly just has a placeholder (highlighted line) that will be resolved when
the final
executable (dll or exe) is linked. As long as your application is a monolith,
with no
internal dlls at any level, the CRT issues should not exist. The linker will
just copy in the
static CRT code and all C library calls will resolve to that.
Again, I stand corrected and I apologize for any confusion that I caused.
I'll talk to Elena and Allen about what we can do to get this set up and
document it. I'd
still want it flagged as dangerous since I suspect it will burn a lot of
people.
Cheers,
Dana
