Replace CMAKE_CURRENT_SOURCE_DIR to CMAKE_CURRENT_LIST_DIR

[phprus]

Replace CMAKE_CURRENT_SOURCE_DIR to CMAKE_CURRENT_LIST_DIR to allow reuse script cmake/detect-arch.cmake in parent CMake project.

[codecov]

Codecov Report

Merging #980 (5030a46) into develop (07fa171) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #980   +/-   ##
========================================
  Coverage    75.81%   75.81%           
========================================
  Files           74       74           
  Lines         8082     8082           
  Branches      1344     1344           
========================================
  Hits          6127     6127           
  Misses        1425     1425           
  Partials       530      530           

Flag	Coverage Δ
macos_clang	68.55% <ø> (ø)
macos_gcc	67.45% <ø> (ø)
ubuntu_clang_debug	?
ubuntu_clang_msan	∅ <ø> (∅)
ubuntu_gcc	68.70% <ø> (ø)
ubuntu_gcc_aarch64	68.98% <ø> (ø)
ubuntu_gcc_aarch64_compat_no_opt	67.32% <ø> (ø)
ubuntu_gcc_aarch64_no_acle	67.89% <ø> (ø)
ubuntu_gcc_aarch64_no_neon	68.29% <ø> (ø)
ubuntu_gcc_armhf	68.97% <ø> (ø)
ubuntu_gcc_armhf_compat_no_opt	67.32% <ø> (ø)
ubuntu_gcc_armhf_no_acle	69.13% <ø> (ø)
ubuntu_gcc_armhf_no_neon	69.46% <ø> (ø)
ubuntu_gcc_armsf	68.98% <ø> (ø)
ubuntu_gcc_armsf_compat_no_opt	67.32% <ø> (ø)
ubuntu_gcc_compat_no_opt	68.71% <ø> (ø)
ubuntu_gcc_mingw_i686	0.00% <ø> (ø)
ubuntu_gcc_mingw_x86_64	0.00% <ø> (ø)
ubuntu_gcc_no_avx2	69.06% <ø> (ø)
ubuntu_gcc_no_pclmulqdq	66.88% <ø> (ø)
ubuntu_gcc_no_sse2	68.11% <ø> (ø)
ubuntu_gcc_no_sse4	66.85% <ø> (ø)
ubuntu_gcc_o3	68.43% <ø> (ø)
ubuntu_gcc_osb	70.98% <ø> (ø)
ubuntu_gcc_ppc	69.16% <ø> (ø)
ubuntu_gcc_ppc64	69.95% <ø> (ø)
ubuntu_gcc_ppc64le	68.65% <ø> (ø)
ubuntu_gcc_s390x	67.90% <ø> (ø)
ubuntu_gcc_sparc64	70.35% <ø> (ø)
win64_gcc	70.39% <ø> (ø)
win64_gcc_compat_no_opt	73.88% <ø> (ø)

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[Dead2]

Could you explain the use-case here? It is a little unclear what problem you are trying to solve here.

[mtl1979]

@Dead2 The change allows using include() instead of add_subdirectory() when parent project wants to use functions declared by build system of zlib-ng (CMakeLists.txt and any files directly or indirectly included from it).

I'm not completely sure if we would want to allow that.

[phprus]

This change will allow create a configuration like this:

project(BaseProject)

include(zlib-ng/cmake/detect-arch.cmake)

if(BASEARCH_X86_FOUND)
    # x86 project options
    ...
endif()

...

add_subdirectory(zlib-ng)

...

target_link_libraries(exe
    PRIVATE
        zlibstatic
)

To reuse the architecture detection code from zlib-ng.