在PintOS上运行make时获取未定义的“floor”参考 [英] Getting undefined reference to `floor' on running make in PintOS

问题描述

我试图在PintOS makefile上运行make，但是我一直收到未定义的对'floor'错误的引用。下面是makefile。我使用gcc 4.6.1运行Ubuntu 11.10。任何帮助表示赞赏。

 全部：setitimer-helper squish-pty squish-unix 
 CC = gcc 
 CFLAGS = -Wall -W 
 LDFLAGS = -lm 
 setitimer-helper：setitimer-helper.o 
 squish-pty：squish-pty.o 
 squish-unix：squish -unix.o 
 
 clean：
 rm -f * .o setitimer-helper squish-pty squish-unix 
  

〜

解决方案

-lm 应该在 LDLIBS 中，而不是 LDFLAGS 。

  $（CC）$（LDFLAGS）no $ （LOADLIBES）$（LDLIBS）
  

和 ld （由GCC调用）具有严格的从左到右的依赖关系解析算法。

I am trying to run make on a PintOS makefile but I keep getting the undefined reference to `floor' error. The makefile is below. I am running Ubuntu 11.10 with gcc 4.6.1. Any help is appreciated.

    all: setitimer-helper squish-pty squish-unix
    CC = gcc
    CFLAGS = -Wall -W
    LDFLAGS = -lm
    setitimer-helper: setitimer-helper.o
    squish-pty: squish-pty.o
    squish-unix: squish-unix.o

    clean: 
          rm -f *.o setitimer-helper squish-pty squish-unix

~

解决方案

-lm should be in LDLIBS, not LDFLAGS.

The difference is important, because the implicit rule for linking executables is:

$(CC) $(LDFLAGS) n.o $(LOADLIBES) $(LDLIBS)

and ld (invoked by GCC) has a strict left-to-right dependency-resolution algorithm.

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