Makefile for mixed C/C++ sources and vscode project configuration (https://code.visualstudio.com/docs/languages/cpp)

c_cpp_properties.json

{
    "env": {},
    "configurations": [
        {
            "name": "Mac",
            "includePath": [
                "/usr/local/include",
                "/usr/local/Cellar/gcc/9.1.0/include/c++/9.1.0/",
                "/usr/local/Cellar/gcc/9.1.0/include/c++/9.1.0/x86_64-apple-darwin18",
                "${workspaceFolder}/**"
            ],
            "defines": [
                "DEBUG",
                "ENABLE_LOGGING"
            ],
            "compilerPath": "/usr/local/bin/g++-9",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "gcc-x64",
            "browse": {
                "databaseFilename": "",
                "limitSymbolsToIncludedHeaders": true,
                "path": [
                    "${workspaceRoot}"
                ]
            },
            "macFrameworkPath": []
        }
    ],
    "version": 4
}

keybindings.json

[
    {
        "key": "cmd+f9",
        "command": "workbench.action.tasks.runTask",
        "args": "make"
    },
    {
        "key": "f9",
        "command": "workbench.action.tasks.runTask",
        "args": "make run"
    },
    {
        "key": "f8",
        "command": "workbench.action.tasks.runTask",
    },
]

launch.json

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    // If gdb doesn't work, please check https://forward-in-code.blogspot.com/2018/11/mojave-vs-gdb.html?m=1
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch (gdb)",
            "type": "cppdbg",
            "request": "launch",
            "preLaunchTask": "make",
            "program": "${workspaceFolder}/out/${workspaceFolderBasename}",
            "args": [],
            "stopAtEntry": true,
            "logging": {
                "trace": true,
                "traceResponse": true
            },
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": true,
            "MIMode": "gdb",
            "miDebuggerPath": "/usr/local/bin/gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        },
        {
            "name": "Launch (lldb)",
            "type": "lldb",
            "request": "launch",
            "preLaunchTask": "make",
            "program": "${workspaceFolder}/out/${workspaceFolderBasename}",
            "args": [],
            "cwd": "${workspaceFolder}"
        },
    ]
}

Makefile

#======================================================================
# Makefile for mixed C/C++ sources (igoticecream 2019)
#======================================================================

#----------------------------------------------------------------------
# Project Structure
#----------------------------------------------------------------------
# TARGET    is the name of the output
# BUILD     is the directory where object files & intermediate files will be placed
# OUT       is the directory where target files will be placed
# SOURCES   is a list of directories containing source code
# INCLUDES  is a list of directories containing header files
# LIBRARIES is a list of directories containing libraries, this must be the top level containing include and lib
# DATA      is a list of directories containing data files
# RESOURCES is a list of directories containing other files
#----------------------------------------------------------------------
TARGET    := $(notdir $(CURDIR))
BUILD     := build
OUT       := out
SOURCES   := source
INCLUDES  := include
LIBRARIES := /usr/local
RESOURCES :=
DATA      :=

#----------------------------------------------------------------------
# Languages Standard
#----------------------------------------------------------------------
C_STANDARD   := -std=c11
CXX_STANDARD := -std=c++17

#----------------------------------------------------------------------
# Defined Symbols
#----------------------------------------------------------------------
DEFINES += -DDEBUG
DEFINES += -DENABLE_LOGGING

#----------------------------------------------------------------------
# Sources & Files
#----------------------------------------------------------------------
OUTPUT     := $(CURDIR)/$(OUT)/$(TARGET)
SYMBOLS    := $(CURDIR)/$(BUILD)/$(TARGET).out

CSOURCES   := $(foreach dir,$(SOURCES),$(wildcard $(dir)/*.c))
CXXSOURCES := $(foreach dir,$(SOURCES),$(wildcard $(dir)/*.cpp))
ASMSOURCES := $(foreach dir,$(SOURCES),$(wildcard $(dir)/*.s))

OBJS       := $(patsubst %,$(BUILD)/%.o,$(basename $(CSOURCES)) $(basename $(CXXSOURCES)) $(basename $(ASMSOURCES)))
DEPS       := $(patsubst %,$(BUILD)/%.d,$(basename $(CSOURCES)) $(basename $(CXXSOURCES)) $(basename $(ASMSOURCES)))

INCLUDE    += $(addprefix -I,$(foreach dir,$(INCLUDES), $(wildcard $(dir))))
INCLUDE    += $(addprefix -I,$(foreach dir,$(LIBRARIES),$(wildcard $(dir)/include)))

LDLIBS     += $(addprefix -L,$(foreach dir,$(LIBRARIES),$(wildcard $(dir)/lib)))
LDLIBS     += $(addprefix -L,$(foreach dir,$(LIBRARIES),$(wildcard $(dir)/library)))

#----------------------------------------------------------------------
# Compiler & Linker
#----------------------------------------------------------------------
CC  := /usr/local/bin/gcc-9
CXX := /usr/local/bin/g++-9
AS  := /usr/local/bin/gcc-9
AR  := /usr/local/bin/gcc-ar-9 # or /usr/local/opt/binutils/bin/ar
NM  := /usr/local/bin/gcc-nm-9 # or /usr/local/opt/binutils/bin/nm

#----------------------------------------------------------------------
# Compiler & Linker Flags
#----------------------------------------------------------------------
# CPPFLAGS  C and C++ Compiler Flags
# CFLAGS    C Compiler Flags
# CXXFLAGS  C++ Compiler Flags
# ASFLAGS   ASM Compiler Flags
# LDFLAGS   Linker Flags
#----------------------------------------------------------------------
CPPFLAGS  += $(DEFINES) $(INCLUDE)
CPPFLAGS  += -ggdb
CPPFLAGS  += -g3
CPPFLAGS  += -Og
#CPPFLAGS += -O3
CPPFLAGS  += -fmessage-length=0
CPPFLAGS  += -fsigned-char
CPPFLAGS  += -fPIC

CFLAGS    += $(CPPFLAGS)
CFLAGS    += -Wall
CFLAGS    += -Wextra
CFLAGS    += -Werror
CFLAGS    += -pedantic
CFLAGS    += -pedantic-errors
CFLAGS    += -Wfatal-errors
CFLAGS    += -Wpacked
CFLAGS    += -Winline
CFLAGS    += -Wfloat-equal
CFLAGS    += -Wconversion
CFLAGS    += -Wpointer-arith
CFLAGS    += -Wdisabled-optimization
CFLAGS    += -Wunknown-pragmas
CFLAGS    += -Wno-unused-parameter
CFLAGS    += -Wno-unused-function
CFLAGS    += -Wno-unused-variable

CXXFLAGS  += $(CFLAGS)
CXXFLAGS  += -Weffc++
CXXFLAGS  += -Wfloat-equal
CXXFLAGS  += -Wsign-promo
CXXFLAGS  += -Wmissing-declarations
CXXFLAGS  += -Woverloaded-virtual
CXXFLAGS  += -Wmissing-format-attribute
CXXFLAGS  += -Wold-style-cast
CXXFLAGS  += -Wshadow
CXXFLAGS  += -Wctor-dtor-privacy

ASFLAGS   += $(CPPFLAGS)
ASFLAGS   += -x assembler-with-cpp

LDFLAGS   += -lmbedtls
LDFLAGS   += -lmbedx509
LDFLAGS   += -lmbedcrypto

#----------------------------------------------------------------------
# Compiler & Linker Commands
#----------------------------------------------------------------------
# LINK.o      link object files to binary
# COMPILE.c   compile C source files
# COMPILE.cpp compile C++ source files
#----------------------------------------------------------------------
ifeq ($(strip $(CXXSOURCES)),)
    LD := $(CC)
else
    LD := $(CXX)
endif

DEPFLAGS   += -MT $@
DEPFLAGS   += -MMD
DEPFLAGS   += -MP
DEPFLAGS   += -MF $(BUILD)/$*.d

LINK.o      = $(LD) $(LDFLAGS) $(LDLIBS) $^ -o $@
COMPILE.c   = $(CC) $(C_STANDARD) $(CFLAGS) $(DEPFLAGS) -c $< -o $@
COMPILE.cpp = $(CXX) $(CXX_STANDARD) $(CXXFLAGS) $(DEPFLAGS) -c $< -o $@
COMPILE.s   = $(AS) $(ASFLAGS) $(DEPFLAGS) -c $< -o $@
SYMBOLS.out = $(NM) -CSn $@ > $(SYMBOLS)

#----------------------------------------------------------------------
# Special Built-in Target
#----------------------------------------------------------------------
# .SUFFIXES     disable built-in wildcard rules
# .INTERMEDIATE make will treat targets as intermediate files, and delete them
# .PRECIOUS     make will not be deleted after it is no longer needed. Keep objects to speed up recompilation
# .PHONY        make will run this targets unconditionally, regardless of whether a file with that name exists or what its last-modification time is
#----------------------------------------------------------------------
.SUFFIXES:
.INTERMEDIATE:
.PRECIOUS: $(OBJS) $(DEPS)
.PHONY: all clean help

#----------------------------------------------------------------------
# Targets
#----------------------------------------------------------------------
all: $(OUTPUT)

$(OUTPUT): $(OBJS)
	@mkdir -p $(@D)
	$(LINK.o)
	$(SYMBOLS.out)

$(BUILD)/%.o: %.c
	@mkdir -p $(@D)
	$(COMPILE.c)

$(BUILD)/%.o: %.cpp
	@mkdir -p $(@D)
	$(COMPILE.cpp)

$(BUILD)/%.o: %.s
	@mkdir -p $(@D)
	$(COMPILE.s)

run: $(OUTPUT)
	@$<

clean:
	@$(RM) -r $(BUILD) $(OUT)

help:
	@echo available targets: all run clean

-include $(DEPS)

settings.json

{
    "files.associations": {
        "*.h": "c",
        "*.c": "c",
        "*.hpp": "cpp",
        "*.cpp": "cpp",
    },
    "files.exclude": {
        "**/.envrc": true,
        "**/.DS_Store": true,
        "**/out": true,
        "**/build": true,
    },
    "code-runner.cwd": "$workspaceRoot",
    "code-runner.executorMap": {
        "c":   "make -j4 run",
        "cpp": "make -j4 run",
    },
    "C_Cpp.autoAddFileAssociations": false,
    "C_Cpp.intelliSenseEngine": "Default",
    "C_Cpp.clang_format_fallbackStyle": "{ BasedOnStyle: LLVM, UseTab: Never, IndentWidth: 4, ContinuationIndentWidth: 4, ConstructorInitializerIndentWidth: 4, AccessModifierOffset: -4, NamespaceIndentation: All, AlignConsecutiveAssignments: true, AlignConsecutiveDeclarations: true, AllowShortIfStatementsOnASingleLine: false, IndentCaseLabels: false, ColumnLimit: 0, TabWidth: 4, FixNamespaceComments: false, IndentPPDirectives: AfterHash }",
}

// https://clang.llvm.org/docs/ClangFormatStyleOptions.html

tasks.json

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "options": {
        "shell": {
            "executable": "/bin/zsh",
            "args": ["-c"]
        },
        "env": {},
        "cwd": "${workspaceFolder}",
    },
    "presentation": {
        "clear": true,
        "echo": false,
        "reveal": "always",
        "revealProblems": "onProblem",
        "focus": true,
        "panel": "shared",
        "showReuseMessage": true
    },
    "problemMatcher": [
        "$gcc"
    ],
    "tasks": [
        {
            "label": "make",
            "type": "shell",
            "command": "make -j4",
            "group": {
                "isDefault": true,
                "kind": "build"
            },
            "presentation": {
                "reveal": "silent",
                "focus": false,
                "showReuseMessage": false
            }
        },
        {
            "label": "make run",
            "type": "shell",
            "command": "make -j4 run",
            "group": "build",
            "dependsOn": ["make"]
        },
        {
            "label": "make clean",
            "type": "shell",
            "command": "make -j4 clean",
            "group": "none",
            "presentation": {
                "reveal": "silent",
                "focus": false,
                "showReuseMessage": false
            }
        }
    ]
}