November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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706
20
章
make
で
C
プログラムをビルドする
circle: circle.o $(call getmodulename,circulararea.o,$(STATIC))
$(CC) -o $@ $^
ifndef STATIC
%.so: %.o
$(CC) -shared -o $@ $<
endif
$(call
…
)
関数はマクロ
getmodulename
をテキスト
circulararea.o
か、もし
STATIC
が定
義されていなければ、
circulararea.so
に展開する。
例20-5のオブ ジェクトファイル
circulararea.o
をビルドするルールは、次の主 題、
STATIC
フラグをクエリするもう1つの方法、条件指令
ifndef
を示している。
20.10
指令
単純展開変数すなわち関数を生成する
define
指令は既に取り上げた。他のmake指令に
は、makeファイルのある行を変数条件に依存させる、または、追
加makeファイルをその
場で挿入してmakeファイルの実効内容に動的に影響を与えるものがある。
20.10.1
条件
makeファイルの一部を
ifdef
または
ifndef
指令を用いて変数が存在するかどうかによ
る条件分岐にすることができる。これらは同じ名前のCプリプロセッサ指令と、makeでは
未定義変数が値が空の変数と同じということを除いて、同様に働く。次に例を示す。
OBJ = circle.o
LIB = -lm
ifdef SHAREDLIBS
LIB += circulararea.so ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.