SVS support for Amazon linux 2

[ethanglaser]

Describe the changes in the pull request

Adds SVS shared+static library support for Amazon Linux 2. Checks os-release content and uses build from glibc 2.26 for this OS, otherwise continues using broader supporting glibc 2.28 SVS build.

Mark if applicable

• This PR introduces SVS shared library changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.86%. Comparing base (fa336dd) to head (0930288).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #718      +/-   ##
==========================================
- Coverage   96.88%   96.86%   -0.03%     
==========================================
  Files         122      122              
  Lines        7359     7359              
==========================================
- Hits         7130     7128       -2     
- Misses        229      231       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[meiravgri]

I find the current phrasing a bit confusing. Could we rephrase or reorder the conditions to make it clearer?

[rfsaliev]

Not sure if it is fully correct to focus on OS version rather than GLIBC.
More proper way could be adding between lines 48-49 (if GLIBC_FOUND):

    else()
        include(CheckCSourceRuns)
        check_c_source_runs("#include <features.h>
            int main(){ return __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 28 ?0:1; }"
            GLIBC_2_28_FOUND)
        check_c_source_runs("#include <features.h>
            int main(){ return __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 26 ?0:1; }"
            GLIBC_2_26_FOUND)

then, at line 51

- cmake_dependent_option(SVS_SHARED_LIB "Use SVS pre-compiled shared library" ON "USE_SVS AND GLIBC_FOUND AND SVS_LVQ_SUPPORTED" OFF)
+ cmake_dependent_option(SVS_SHARED_LIB "Use SVS pre-compiled shared library" ON "USE_SVS AND GLIBC_2_26_FOUND AND SVS_LVQ_SUPPORTED" OFF)

Then here:

Suggested change

	# Use build from glibc 2.26 if using Amazon Linux 2 OS, otherwise use glibc 2.28 build
	file(READ "/etc/os-release" OS_RELEASE_CONTENT)
	string(FIND "${OS_RELEASE_CONTENT}" "Amazon Linux 2" AMAZON_LINUX_2_FOUND)
	if (NOT AMAZON_LINUX_2_FOUND EQUAL -1)
	set(SVS_URL "https://github.com/intel/ScalableVectorSearch/releases/download/v0.0.8-dev/svs-shared-library-0.0.8-NIGHTLY-20250701-glibc-2_26.tar.gz" CACHE STRING "SVS URL")
	else()
	set(SVS_URL "https://github.com/intel/ScalableVectorSearch/releases/download/v0.0.8-dev/svs-shared-library-0.0.8-NIGHTLY-20250630.tar.gz" CACHE STRING "SVS URL")
	endif()
	if (GLIBC_2_28_FOUND)
	set(SVS_URL "https://github.com/intel/ScalableVectorSearch/releases/download/v0.0.8-dev/svs-shared-library-0.0.8-NIGHTLY-20250630.tar.gz" CACHE STRING "SVS URL")
	else()
	set(SVS_URL "https://github.com/intel/ScalableVectorSearch/releases/download/v0.0.8-dev/svs-shared-library-0.0.8-NIGHTLY-20250701-glibc-2_26.tar.gz" CACHE STRING "SVS URL")
	endif()

[rfsaliev]

Proposing #720

[ethanglaser]

Closing in favor of #720