make始终重建Makefile目标

问题描述

我重新设计了我的论文项目的大部分

NOTE: sf.done is a real file (of type, which I call "flag files"), located in a different sub-directory and created/updated upon completion of data collection (import) - dependent step for the target transform.

准备/ Makefile：

IMPORT_DIR=../import

prepare: import \
         transform \
         cleanup \
         merge \
         sample

import: $(IMPORT_DIR)/sf.done
transform: transform.done
cleanup: cleanup.done
merge: merge.done
sample: sample.done

transform.done: transform.R import
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

cleanup.done: cleanup.R transform
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

merge.done: merge.R cleanup
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

sample.done: sample.R merge
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

.PHONY: import transform cleanup merge sample clean

# remove intermediate files
clean:
    rm -f tmp*.bz2 *.Rdata .Rout

更新：

IMPORT_DIR = ../import
IMPORT_DONE = $(IMPORT_DIR)/sf.done

prepare: import \
         transform \
         cleanup \
         merge \
         sample

import: import.done
transform: transform.done
cleanup: cleanup.done
merge: merge.done
sample: sample.done

import.done: $(IMPORT_DONE)
    @cd $(IMPORT_DIR) && $(MAKE)

transform.done: transform.R import.done
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

cleanup.done: cleanup.R transform.done
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

merge.done: merge.R cleanup.done
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

sample.done: sample.R merge.done
    @$(RSCRIPT) $(R_OPTS) $<
    @touch $@

.PHONY: import transform cleanup merge sample clean

推荐答案

您已经宣布了目标 import transform cleanup merge sample clean 为 .PHONY 。这意味着make会永远认为它们已经过时了。

You've declared the targets import transform cleanup merge sample clean to be .PHONY. That means that make will always consider them to be out of date.

然后你声明各种 .done 目标依赖于 .PHONY 目标。由于虚假的目标总是被认为已经过时，那些 .done 目标总是需要更新，食谱总是触发。

Then you declare the various .done targets to depend on those .PHONY targets. Since the phony targets are always considered out of date, those .done targets always need to be updated, and the recipes always fire.

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