Add abseil@20250127 formula

Formula/abseil@20250127.rb

@@ -0,0 +1,39 @@
+class AbseilAT20250127 < Formula
+  desc "C++ Common Libraries (Last LTS version with C++14 support)"
+  homepage "https://abseil.io"
+  url "https://github.com/abseil/abseil-cpp/archive/refs/tags/20250127.0.tar.gz"
+  sha256 "dcf71b9cba8dc0ca9940c4b316a0c796be8fab42b070bb6b7cab62b48f0e66c4"
+  license "Apache-2.0"
+
+  keg_only :versioned_formula
+
+  depends_on "cmake" => :build
+
+  def install
+    # Abseil requires C++14 for this version
+    # Build as static libraries
+    system "cmake", "-S", ".", "-B", "build",
+                    "-DCMAKE_CXX_STANDARD=14",
+                    "-DBUILD_SHARED_LIBS=OFF",
+                    "-DCMAKE_INSTALL_RPATH=#{rpath}",
+                    *std_cmake_args
+    system "cmake", "--build", "build"
+    system "cmake", "--install", "build"
+  end
+
+  test do
+    (testpath/"test.cc").write <<~EOS
+      #include <iostream>
+      #include "absl/strings/str_format.h"
+      int main() {
+        std::cout << absl::StrFormat("%s %s!", "Hello", "world");
+        return 0;
+      }
+    EOS
+    system ENV.cxx, "-std=c++14", "-I#{include}", "-L#{lib}", "-labsl_str_format_internal",
+           "-labsl_strings", "-labsl_strings_internal", "-labsl_base", "-labsl_spinlock_wait",
+           "-labsl_int128", "-labsl_throw_delegate", "-labsl_raw_logging_internal",
+           "-labsl_log_severity", "test.cc", "-o", "test"
+    assert_equal "Hello world!", shell_output("./test")
+  end
+end