conan-center: add meson to exception list of KB-H019 (it contains a cmake script)

[madebr]

This pr adds meson to the exception list of KB-H019.

This should fix the CI failures I'm having with pkgconf at conan-io/conan-center-index#1013 (comment)

I've just checked meson 0.54.3 and it contains the following cmake script:

• bin/mesonbuild/cmake/data/preload.cmake

I've copied the contents of the script here below.
I think an exception is required instead of adding it to cpp_info.builddirs.

contents of meson's preload.cmake

if(MESON_PS_LOADED)
  return()
endif()

set(MESON_PS_LOADED ON)

# Dummy macros that have a special meaning in the meson code
macro(meson_ps_execute_delayed_calls)
endmacro()

macro(meson_ps_reload_vars)
endmacro()

# Helper macro to inspect the current CMake state
macro(meson_ps_inspect_vars)
  set(MESON_PS_CMAKE_CURRENT_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
  set(MESON_PS_CMAKE_CURRENT_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
  meson_ps_execute_delayed_calls()
endmacro()


# Override some system functions with custom code and forward the args
# to the original function
macro(add_custom_command)
  meson_ps_inspect_vars()
  _add_custom_command(${ARGV})
endmacro()

macro(add_custom_target)
  meson_ps_inspect_vars()
  _add_custom_target(${ARGV})
endmacro()

macro(set_property)
  meson_ps_inspect_vars()
  _set_property(${ARGV})
endmacro()

function(set_source_files_properties)
  set(FILES)
  set(I 0)
  set(PROPERTIES OFF)

  while(I LESS ARGC)
    if(NOT PROPERTIES)
      if("${ARGV${I}}" STREQUAL "PROPERTIES")
        set(PROPERTIES ON)
      else()
        list(APPEND FILES "${ARGV${I}}")
      endif()

      math(EXPR I "${I} + 1")
    else()
      set(ID_IDX ${I})
      math(EXPR PROP_IDX "${ID_IDX} + 1")

      set(ID   "${ARGV${ID_IDX}}")
      set(PROP "${ARGV${PROP_IDX}}")

      set_property(SOURCE ${FILES} PROPERTY "${ID}" "${PROP}")
      math(EXPR I "${I} + 2")
    endif()
  endwhile()
endfunction()

set(MESON_PS_DELAYED_CALLS add_custom_command;add_custom_target;set_property)
meson_ps_reload_vars()

/cc @uilianries @ericLemanissier

[ericLemanissier]

Just To be clear, the pkgconf fails independantly of this hook:

ERROR: pkgconf/1.7.3 (test package): Error in test() method, line 34 	raise ConanException("PKG_CONFIG variable incorrect") 	ConanException: PKG_CONFIG variable incorrect

[madebr]

Indeed, the pkgconf recipe isn't finished yet.
The error/warning when running ninja install on windows is non-fatal btw.

[ericLemanissier]

Something is still fuzzy to me: this hook failure happened for meson and all projects requiring meson, yet the bot never shows this hook failure, except when the build fails for some other reason. Is it what's supposed to happen ?

[SpaceIm]

I've added this folder to builddirs conan-io/conan-center-index#4420, it's a recurrent source of misleading errors reports in PRs, and it pollutes logs for consumers.

[SpaceIm]

Oh I see, this PR is still opened 😢

[ericLemanissier]

this may not be needed any more, now that conan-io/conan-center-index#4420 is merged

[danimtb]

I think this PR needs to be updated with latest changes in master branch to make the CI green

[ericLemanissier]

@madebr this PR can be closed, with conan-io/conan-center-index#4420 merged

[madebr]

Closed it is then!