RE: AIX support

Hi Tristan,
Thank you for your feedback and suggestions.

As suggested, we have tried to implement a dependency-driven approach for static library builds, rather than using AIX platform tags.

modified: meson.build
dep_static_lib = declare_dependency() << new dependency

if host_system == 'aix'
dep_static_lib = disabler()
endif

modified: src/interfaces/ecpg/compatlib/meson.build
ecpg_compat_st = static_library('libecpg_compat',
ecpg_compat_sources,
include_directories: ecpg_compat_inc,
c_args: ecpg_compat_c_args,
dependencies: [frontend_stlib_code, thread_dep, dep_static_lib], << new dependency
link_with: [ecpglib_st, ecpg_pgtypes_st],
kwargs: default_lib_args,
)

modified: src/interfaces/ecpg/ecpglib/meson.build
ecpglib_st = static_library('libecpg',
ecpglib_sources,
include_directories: ecpglib_inc,
c_args: ecpglib_c_args,
c_pch: pch_postgres_fe_h,
dependencies: [frontend_stlib_code, thread_dep, libpq, dep_static_lib], << new dependency
link_with: [ecpg_pgtypes_st],
kwargs: default_lib_args,
)

modified: src/interfaces/ecpg/pgtypeslib/meson.build
ecpg_pgtypes_st = static_library('libpgtypes',
ecpg_pgtypes_sources,
include_directories: ecpg_pgtypes_inc,
c_args: ecpg_pgtypes_c_args,
c_pch: pch_postgres_fe_h,
dependencies: [frontend_stlib_code, dep_static_lib], << new dependency
kwargs: default_lib_args,
)

modified: src/interfaces/libpq/meson.build
libpq_st = static_library('libpq',
libpq_sources,
include_directories: [libpq_inc],
c_args: libpq_c_args,
c_pch: pch_postgres_fe_h,
dependencies: [frontend_stlib_code, libpq_deps, dep_static_lib], << new dependency
kwargs: default_lib_args,
)

> I'd like to see if Peter thinks this is a good idea before implementing it.
Also I would like to understand Peter/Heikki thoughts as well on this new implementation.

> Should we consolidate all Meson AIX support into one patch?
> Overall, I think the size of the patch is good, and seem pretty maintainable.

Thank you, Tristan, for your assistance. At present, the build appears stable

with the recent changes, however, the new dependency is causing impacts

elsewhere(with tmp_install). I will provide the consolidated patch after addressing these concerns.

Thanks,
Sriram.