abacus: bootstrap build system

meson.build

@@ -0,0 +1,13 @@
+project(
+  'abacus',
+  'cpp',
+  version: '0.0.0',
+  license: 'MIT',
+  default_options: [
+    'warning_level=3',
+    'cpp_std=c++17',
+  ],
+)
+
+subdir('src')
+subdir('tests')

src/abacus.cc

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+#include <iostream>
+
+int main() {
+    std::cout << "Hello World!\n";
+}

src/meson.build

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+abacus_sources = files(
+  'abacus.cc',
+)
+
+abacus = executable(
+  'abacus',
+  sources: abacus_sources,
+)

tests/meson.build

@@ -0,0 +1 @@
+subdir('unit')

tests/unit/base.cc

@@ -0,0 +1,5 @@
+#include <gtest/gtest.h>
+
+TEST(misc, passing) {
+    ASSERT_EQ(1, 1);
+}

tests/unit/meson.build

@@ -0,0 +1,25 @@
+gtest = dependency(
+  'gtest',
+  main: true,
+  required: false,
+)
+
+if gtest.found()
+  unit_test_sources = files(
+    'base.cc',
+  )
+
+  unit_tests = executable(
+    'unit_tests',
+    sources: unit_test_sources,
+    dependencies: [
+      gtest,
+    ],
+  )
+
+  test(
+    'unit tests',
+    unit_tests,
+    protocol: 'gtest',
+  )
+endif