Question

我正在尝试编译一些第三方代码并且遇到了一些奇怪的NMAKE行为。

Makefile中的行是

cholmod_aat.o: ../Core/cholmod_aat.c
        $(C) -c $(I) $< -Fo$@

会产生以下错误：


Wed, Aug 15 2012 23:25:20           ../Include/cholmod.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_blas.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_check.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_cholesky.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_complexity.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_config.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_core.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_internal.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_matrixops.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_modify.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_partition.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_supernodal.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_template.h
Fri, Aug 17 2012 16:06:24           ../Core/cholmod_aat.c
                                  cholmod_aat.o target does not exist
NMAKE : warning U4006: special macro undefined : '$<'
        cl -O2 -nologo -D__MINGW32__ /MD -DNPARTITION -c -I../../AMD/Include -I.
./../AMD/Source -I../../COLAMD/Include  -I../../metis-4.0/Lib -I../../CCOLAMD/In
clude -I../../CAMD/Include  -I../Include -I../../UFconfig  -Focholmod_aat.o
cl : Command line error D8003 : missing source filename
NMAKE : fatal error U1077: '"c:\Program Files (x86)\Microsoft Visual Studio 10.0
\VC\BIN\cl.EXE"' : return code '0x2'
Stop.

为什么nmake说'$＆lt;'当它事先将cholmod_aat.c列为依赖项时，它是“未定义的”吗？更令人困惑的是，如果我更换$＆lt;用$？在makefile中，nmake扩展'$？'很好：


Wed, Aug 15 2012 23:25:20           ../Include/cholmod.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_blas.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_check.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_cholesky.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_complexity.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_config.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_core.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_internal.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_matrixops.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_modify.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_partition.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_supernodal.h
Wed, Aug 15 2012 23:25:20           ../Include/cholmod_template.h
Fri, Aug 17 2012 16:06:24           ../Core/cholmod_aat.c
                                  cholmod_aat.o target does not exist
        cl -O2 -nologo -D_MINGW32_ /MD -DNPARTITION -c -I../../AMD/Include -I.
./../AMD/Source -I../../COLAMD/Include  -I../../metis-4.0/Lib -I../../CCOLAMD/In
clude -I../../CAMD/Include  -I../Include -I../../UFconfig ../Include/cholmod.h .
./Include/cholmod_blas.h ../Include/cholmod_check.h ../Include/cholmod_cholesky.
h ../Include/cholmod_complexity.h ../Include/cholmod_config.h ../Include/cholmod
_core.h ../Include/cholmod_internal.h ../Include/cholmod_matrixops.h ../Include/
cholmod_modify.h ../Include/cholmod_partition.h ../Include/cholmod_supernodal.h
../Include/cholmod_template.h ../Core/cholmod_aat.c -Focholmod_aat.o

发生了什么事？

Answer 1

答案在MSDN：

$＆LT; - 具有比当前目标更晚的时间戳的从属文件。仅在推理规则中的命令中有效。

它不在“推理规则”中，它位于“描述块”中，因为这些内容在NMAKE中被调用。

--- 编辑：扩展我的原始答案---

术语有点奇怪，因此在这种情况下，最简单的例子就是显示。我创建了一个包含2个规则的makefile - 描述块（a.k.a.目标规则）和推理规则。

C:\temp>type makefile.txt
c.txt : a.txt b.txt
        @echo $?
        @echo %s

.SUFFIXES: .log

.log.txt:
        @echo $<

我为虚拟输入创建了空文件a.txt，b.txt和d.log。然后我在目标c.txt和d.txt上运行了makefile：

C:\temp>nmake /f makefile.txt c.txt d.txt

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

a.txt b.txt
a.txt
d.log

C:\temp>

希望这说明$？，％s和$＆lt;之间的区别。 MSDN文档相当简洁，但代码确实可以正常工作。诚实！

Answer 2

您可以尝试以下方法：

cholmod_aat.obj: ../Core/cholmod_aat.c
        $(C) -c $(I) %s -Fo$@

符号％s映射到列表中的第一个依赖项

微软nmake：$？扩大但$＆lt;才不是

2 个答案: