Install abseil and downgrade bazel to 7.1.2

Had to downgrade Bazel to 7.1.2 because it was crashing when building
abseil.
See issue: hedronvision/bazel-compile-commands-extractor#199

.bazelversion

@@ -1,3 +1,3 @@
-7.2.1
+7.1.2
 # important to prevent errors from version updates
 # such as: https://github.com/hedronvision/bazel-compile-commands-extractor/issues/199

BUILD.bazel

@@ -3,7 +3,10 @@ load("@rules_cc//cc:defs.bzl", "cc_binary")
 cc_binary(
   name = "hello_main",
   srcs = ["hello_main.cc"],
-  deps = [":hello_world"]
+  deps = [
+    ":hello_world",
+    "@abseil-cpp//absl/flags:parse"
+  ]
 )
 
 cc_library(

MODULE.bazel

@@ -9,6 +9,7 @@ module(
 )
 
 bazel_dep(name = "googletest", version = "1.15.2")
+bazel_dep(name = "abseil-cpp", version = "20240722.0")
 
 # Hedron's Compile Commands Extractor for Bazel
 # https://github.com/hedronvision/bazel-compile-commands-extractor

hello_main.cc

@@ -1,7 +1,12 @@
+#include "absl/flags/flag.h"
+#include "absl/flags/parse.h"
 #include "hello_world.h"
 #include <iostream>
 
-int main() {
-  HelloWorld(std::cout);
+ABSL_FLAG(std::string, name, "World", "name to say hello to");
+
+int main(int argc, char **argv) {
+  absl::ParseCommandLine(argc, argv);
+  HelloWorld(absl::GetFlag(FLAGS_name), std::cout);
   return 0;
 }

hello_world.cc

@@ -1,5 +1,5 @@
 #include <ostream>
 
-void HelloWorld(std::ostream &ostream) {
-  ostream << "Hello World!" << std::endl;
+void HelloWorld(const std::string &name, std::ostream &ostream) {
+  ostream << "Hello " << name << "!" << std::endl;
 }

hello_world.h

@@ -3,6 +3,6 @@
 
 #include <ostream>
 
-void HelloWorld(std::ostream &ostream);
+void HelloWorld(const std::string &name, std::ostream &ostream);
 
 #endif // !HELLO_WORLD_H

hello_world_test.cc

@@ -5,7 +5,7 @@
 TEST(HelloWorld, PrintsHelloWorld) {
   std::ostringstream output_stream;
 
-  HelloWorld(output_stream);
+  HelloWorld("World", output_stream);
 
   EXPECT_EQ(output_stream.str(), "Hello World!\n");
 }