Hello,

I need to compile a C++ application on AIX7.3. This application was previously built on AIX 6.1.0.0 by using autotools and xlC compiler.

I moved all sources to AIX7.3 and tried  to launch  the chain ./configure, make. The configure script checked for xlC_r, ibm-clang++_r, g++ and found g++ was the compiler to use (ibm-clang++_r is installed but not selected by configure).

I ran make and then got a fatal error     #include <bits/c++config.h>  not found, effectively it does exist on my AIX.

So, autotools being quite old ( is CMake the solution ?) I tried to install CMake on AIX7.3 but only found packages for 7.2, so i downloaded code sources from official CMake 3.26.4 website and followed the build guideline  with ./boostrap make. I got the same issue. g++ is the selected compiler and it complains <bis/c++config.h> is not found.

It seems i have an issue with my gcc/g++ installations (missing <bits/c++config.h> ?   

Why ibm-clang++_r is not selected. 

Is CMake compatible with AIX7.3 at this time? if no, will it be ?

It will be nice if you could give me advice

Thanks

best regards

------------------------------
Laurent GUEDJ
------------------------------

#AIXOpenSource

Hi Laurent,

is the application you're trying to compile an open source application? Can you point to the repository?

Regarding CMake on AIX 7.3. It works and can be installed from AIX Toolbox:

# oslevel
7.3.0.0
# dnf search cmake
Last metadata expiration check: 0:00:35 ago on Wed Jul 12 09:30:35 2023.
========================================== Name Exactly Matched: cmake ==========================================
cmake.ppc : Cross-platform, open-source build system
========================================= Name & Summary Matched: cmake =========================================
cmake-data.ppc : Common data-files for cmake
# dnf info cmake
Last metadata expiration check: 0:00:40 ago on Wed Jul 12 09:30:35 2023.
Available Packages
Name         : cmake
Version      : 3.22.0
Release      : 1
Architecture : ppc
Size         : 26 M
Source       : cmake-3.22.0-1.src.rpm
Repository   : AIX_Toolbox
Summary      : Cross-platform, open-source build system
URL          : http://www.cmake.org
License      : BSD
Description  : CMake is used to control the software compilation process using simple
             : platform and compiler independent configuration files. CMake generates
             : native makefiles and workspaces that can be used in the compiler
             : environment of your choice. CMake is quite sophisticated: it is possible
             : to support complex environments requiring system configuration, pre-processor
             : generation, code generation, and template instantiation.
             : 
             : Behavior of CMake on AIX has been changed in 3.14 to obey to AIX rules.
             : See /opt/freeware/share/cmake-3.16/Modules/readme_aix.txt for more informations.

c++config.h is also there after a fresh GCC installation:

# find /opt/freeware -name 'c++config*' 
/opt/freeware/lib/gcc/powerpc-ibm-aix7.3.0.0/10/include/c++/powerpc-ibm-aix7.3.0.0/bits/c++config.h
/opt/freeware/lib/gcc/powerpc-ibm-aix7.3.0.0/10/include/c++/powerpc-ibm-aix7.3.0.0/ppc64/bits/c++config.h
/opt/freeware/lib/gcc/powerpc-ibm-aix7.3.0.0/10/include/c++/powerpc-ibm-aix7.3.0.0/pthread/bits/c++config.h
/opt/freeware/lib/gcc/powerpc-ibm-aix7.3.0.0/10/include/c++/powerpc-ibm-aix7.3.0.0/pthread/ppc64/bits/c++config.h

afaiu the usual cause for the problem is that you upgraded the system after GCC installation. You can reinstall GCC packages or you can execute the post-install script from GCC RPM package:

# Regen include-fixed directory to avoid getting wrong headers being used.
# Export LIBPATH for sed
export LIBPATH=/opt/freeware/lib:/usr/lib:/lib
//opt/freeware/libexec/gcc/powerpc-ibm-aix7.3.0.0/10/install-tools/mkheaders