error LNK2026: module unsafe for SAFESEH image.

error LNK2026: module unsafe for SAFESEH image.

1. module unsafe for SAFESEH image C++

I am using Microsoft Visual Studio 2011 Professional Beta

I am trying to run the OpenCV C++ files (http://opencv.willowgarage.com/wiki/Welcome) that I have compiled using cMake & the Visual Studio Complier.

However when I go to debug the project I get 600+ errors most of them being:

ANSWER: This happens when you link an .obj or .lib that contains code created by an earlier version of the compiler. Which of course would be common if you downloaded a binary for opencv_ffmpeg instead of the source. You can turn the linker option off but then you'll still have a CRT version incompatibility that can byte. Rebuild the library from source. – Hans Passant May 15 at 13:01
ANSWER: Disabling option "Image has Safe Exception Handlers" in Project properties -> Configuration Properties -> Linker -> Advanced tab helped me.
2. module unsafe for SAFESEH image C++

the same as above one.

3. /SAFESEH (Image has Safe Exception Handlers)
/SAFESEH[:NO]
When /SAFESEH is specified, the linker will only produce an image if it can also produce a table of the image's safe exception handlers. This table specifies for the operating system which exception handlers are valid for the image..
4. Visual C++: module unsafe for SAFESEH image, unable to generate SAFESEH image

This means that the linker was started with the option meaning /SAFESEH “image has safe exception handlers” (also note that we only got this because we’re still building 32bit targets). The error occurs because some input modules were not compatible with the safe exception handlers feature of the linker. In our case it was some third party lib files for which I did not have the source code. These lib files are not be compatible with safe exception handlers is because they were created with an older version of the Visual C++ compiler.

But this is easy to fix. You just need to tell the linker not to produce an image with a table of safe exceptions handlers even if it thinks that all modules are compatible with the safe exception handling feature.

If you work in the Visual Studio Editor, you can right-click on your DLL project, go to Properties > Linker > Advanced and set “image has safe exception handlers” to No..

5. What SAFESEH:NO option actually do

I'm trying to use boost::asio::spawn function like in the example, but it gives me the following error in Release:

libboost_context-vc120-mt-s-1_55.lib(jump_i386_ms_pe_masm.obj) : error LNK2026: module unsafe for SAFESEH image
It is clear that I should set /SAFESEH:NO option in the project's settings but I can't understand what this will actually do. How this affect the behavior of exception handling in the program (both C++ exceptions and SEH)?

btw I'm using MSVC-12.0..

Short answer: disabling SafeSEH will reduce your program security.

Details: SafeSEH is a compiler protection.

On a Windows environment SEH (Structured Exception Handler) records are laid out as follows

Theoretic Reasons

6. /SAFESEH (Image has Safe Exception Handlers)

When /SAFESEH is specified, the linker will only produce an image if it can also produce a table of the image's safe exception handlers. This table specifies for the operating system which exception handlers are valid for the image.

/SAFESEH is only valid when linking for x86 targets. /SAFESEH is not supported for platforms that already have the exception handlers noted. For example, on x64 and ARM, all exception handlers are noted in the PDATA. ML64.exe has support for adding annotations that emit SEH information (XDATA and PDATA) into the image, allowing you to unwind through ml64 functions. See MASM for x64 (ml64.exe) for more information.

The most common reason for the linker not to be able to produce an image is because one or more of the input files (modules) to the linker was not compatible with the safe exception handlers feature. A common reason for a module to not be compatible with safe exception handlers is because it was created with a compiler from a previous version of Visual C++..

You can also register a function as a structured exception handler by using .SAFESEH.

It is not possible to mark an existing binary as having safe exception handlers (or no exception handlers); information on safe exception handling must be added at build time.

7. PsInvertedFunctionTable

Somewhat off-topic, but the way SEH works internally has become much more complicated (and also much more performant) since Vista. – BlueRaja - Danny Pflughoeft Jun 24 '16 at 15:55

With the introduction of Windows for x64, significant changes were made to how exceptions are processed with respect to how exceptions operate in x86 versions of Windows. On x86 versions of Windows, exception handlers were essentially demand-registered at runtime by routines with exception handlers (more of a code-based exception registration mechanism).

On x64 versions of Windows, the exception registration path is accomplished using a more data-driven model. Specifically, exception handling (and especially unwind handling) is now driven by metadata attached to each PE image (known as the ``exception directory''), which describes the relationship between routines and their exception handlers, what the exception handler function pointer(s) for each region of a routine are, and how to unwind each routine's machine state in a completely data-driven fashion.

8. Error lnk2026: module unsafe for safeseh image

I got this error when building a sample visual C++ project. First I downloaded 3 sample projects, all solve the same problem, print out all the prime numbers less than N (you may know these sample projects ?). I built the pure-C project without any problem. But when I tried to build the assembly-based project one, I got this error..

9. SAFESEH and assembler code

some tricks in assembly.