HashCode() and IsEqual() redifinitions (Standard_Size.hxx & Standard_Integer.hxx)

[8bit-Dude]

I am trying to compile GEOM and SMESH in windows, using the Headers from OCE.

I have tried with both MinGW and MSVC10, and I get error messages in both saying that HashCode() and IsEqual() are redefined (in Standard_Size.hxx & Standard_Integer.hxx).

Very strangely, I encountered no such issue when compiling OCE itself!
Has anyone got a helpful pointer for me?

[dbarbier]

Indeed, you have to pass -DHAVE_CONFIG_H flag to your compiler, this is a bug in OCE.

[8bit-Dude]

Wow, that was quick!!!
Merci Denis!

[8bit-Dude]

Hmmm.... still getting the same error message.
I added the following lines to CMakeLists.txt:

SET(GCC_COMPILE_FLAGS "-DHAVE_CONFIG_H")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_COMPILE_FLAGS}" )

I have also double checked that the flag is correctly passed to g++.
Any other clues?

[8bit-Dude]

I added this line in Standard_Integer.hxx to make the problem go away:
#define OCE_IS_DUPLICATE_UINT32_T

[dbarbier]

I do not understand why -DHAVE_CONFIG_H did not fix your issue. Is your oce-config.h file empty? Does it define OCE_IS_DUPLICATE_UINT32_T?

[8bit-Dude]

It only contains 3 lines of comment (source: tarball for OCE 0.14.1):

// This is an empty header file which is a placeholder
// when compiling without CMake, and is not used when
// compiling with CMake

[dbarbier]

And how did you build OCE? It looks like you did not use CMake.

[8bit-Dude]

I am using CMake together with MinGW.

[dbarbier]

This is weird. I see two reasons why this may happen:

1. You pass -I<srcdir>/inc flag
2. There is a bug in OCE or CMake; currently, we first copy <srcdir>/inc/oce-config.h, and after that, <builddir>/build_inc/oce-config.h overwrites it.

Can you please check that <srcdir>/inc is not in your include path? If so, I will fix 2.

[8bit-Dude]

Aaaaaah, I understand the problem!!!
The oce-config.h in OCE's /build_inc/ looks correct (generated by CMake when building OCE).
But... my SMESH and GEOM OCE_INCLUDE_PATH points to OCE/inc/
So it never sees the correct oce-config.h file.

[dbarbier]

Okay, but this is still not fully clear; since OCE 0.13, some header files have been moved away from inc/, in particular the ones mentioned on the bug title.
Do you use OCE_COPY_HEADERS_BUILD option? Maybe we should copy build_inc/oce-config.h (or better yet install_inc/oce-config.h) when this option is set.

[dbarbier]

A simpler option is to modify adm/cmake/BuildToolkit.cmake to copy files into <builddir>/install_inc instead of <builddir>/include.

[dbarbier]

Hello, I believe that this issue has been fixed, please reopen if you still have trouble.