From b71f9a58a9af53b097aeca2d84413544695643ea Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sat, 25 Jun 2022 20:56:30 -0700
Subject: Include what you use.

---
 Makefile | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index debe4b5..9e84cc8 100644
--- a/Makefile
+++ b/Makefile
@@ -3,10 +3,12 @@ DEBUG ?= -g
 
 AR ?= ar
 CXX ?= g++
+IWYU ?= iwyu
+CHRONIC ?= chronic
 
 CXXFLAGS := -Wall -Werror -std=c++20 -fPIC -iquote . ${OPTIMIZE} ${DEBUG}
 
-.DEFAULT: issim
+.DEFAULT_GOAL := all
 
 VERSION := $(shell git describe --always --dirty --long --tags 2> /dev/null)
 ifndef VERSION
@@ -21,14 +23,19 @@ std::string GIT_TAG = "$(subst ",\",${VERSION})";
 endef
 export GITTAGCPP
 
+ifneq ($(shell which ${IWYU}),)
+iwyu = ${CHRONIC} ${IWYU} -Xiwyu --error ${CXXFLAGS} $(1)
+else
+$(warning Not using IWYU)
+iwyu =
+endif
+
 libname = $(shell realpath --canonicalize-missing --relative-to . build/$(dir $(1))/lib$(notdir $(1)))
 
 define mklib =
 
 ifneq ($(wildcard $(1)/*.cpp),)
 
-$$(info Component $(call libname,$(1)))
-
 $(call libname,$(1).a): $(patsubst %.cpp,build/%.o,$(wildcard $(1)/*.cpp))
 	@mkdir -p $$(dir $$@)
 	$${AR} cr $$@ $$+
@@ -42,15 +49,22 @@ PARTSOS += $(call libname,$(1).so)
 
 else
 
-$$(info Header-only component $(1))
+$(call libname,$(1).cpp):
+	@mkdir -p $$(dir $$@)
+	@tools/iwyu-header $$(wildcard $(1)/*.h) > $$@
+	@$$(call iwyu,$$@)
+.PHONY: $(call libname,$(1).cpp)
+
+EXTRA_TARGETS += $(call libname,$(1).cpp)
 
 endif
 
 endef
 
-PARTS := $(patsubst ./%,%,$(shell find -mindepth 1 -type d -\( -name .\* -prune -o -name build -prune -o -print -\)))
+PARTS := $(patsubst ./%,%,$(shell find -mindepth 1 -type d -\( -name .\* -prune -o -name build -prune -o -name tools -prune -o -print -\)))
 PARTARS :=
 PARTSOS :=
+EXTRA_TARGETS :=
 
 $(foreach part,${PARTS},$(eval $(call mklib,${part})))
 
@@ -59,6 +73,8 @@ MAINOBJS += build/git-tag.o
 
 $(info )
 
+all: ${EXTRA_TARGETS} issim issim-static
+
 issim: build/issim-dynamic
 	@ln -sf $< $@
 .PHONY: issim
@@ -88,6 +104,7 @@ include $(shell find -type f -name \*.d)
 
 build/%.o: %.cpp
 	@mkdir -p $(dir $@)
+	@$(call iwyu,$<)
 	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<
 
 build/%.o: build/%.cpp
-- 
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