Add Makefile

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
+indent_size = 4
+
+[{*.c,*.h,*.cpp,*.cc}]
+indent_style = space
+indent_size = 4

.gitignore

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+example_binary
+*.o

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

Makefile

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+# 2024 by Alexander Popov <iiiypuk@fastmail.fm>
+
+# Имя исполняемого файла
+PROGRAM		= example_binary
+
+# Компиляторы
+CC			= gcc
+CXX			= clang-16
+
+# Флаги компиляции для исходных файлов C
+CFLAGS		= -O2 -Wall
+# Флаги компиляции для исходных файлов C++
+CXXFLAGS	= -std=c++17 -O2 -Wall
+# Флаги для Си препроцессора (обычно включают пути к файлам и символы, определенные в командной строке), используемые C и C++
+CPPFLAGS	= -g
+
+# Флаги компоновщика
+LDFLAGS		= -O2 -Wall -g
+
+# Библиотеки
+LDLIBS		= -lstdc++
+
+# Файлы исходных кодов
+SRC			= lib.c main.cc
+# Объектные файлы
+OBJ			= $(subst .cc,.o,$(SRC))
+OBJ			:= $(subst .c,.o,$(OBJ))
+
+RM			= rm -f
+
+# Правило по умолчанию
+all: $(PROGRAM)
+
+# Сборка иисполняемого файла
+$(PROGRAM): $(OBJ)
+	$(CXX) $(LDFLAGS) -o $@ $(OBJ) $(LDLIBS)
+
+# Сборка объектных файлов
+lib.o: lib.c lib.h
+main.o: main.cc lib.h
+
+# Очистка скомпилированных файлов
+clean:
+	$(RM) $(OBJ)
+
+# Удаление программы
+distclean: clean
+	$(RM) $(PROGRAM)

lib.c

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+#include "lib.h"
+
+int calc_num(int a, int b) { return a + b; }

lib.h

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+#ifndef LIB_H_
+#define LIB_H_
+
+int calc_num(int a, int b);
+
+#endif // LIB_H_

main.cc

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+#include <iostream>
+
+extern "C" {
+#include "lib.h"
+}
+
+int main(int argc, char const *argv[]) {
+  int x, y, sum;
+
+  x = 15;
+  y = 8;
+  sum = calc_num(x, y);
+
+  std::cout << "Sum: " << sum << std::endl;
+
+  return 0;
+}