GNU make: nesting of $(foreach...) and $(call...) produces Error: *** multiple target patterns. Stop

Question

问题

我正在尝试使用 GNU make 中的通用规则设置多阶段数据处理管道。但是，我收到错误：

Makefile:29: *** multiple target patterns. Stop.

我怀疑这是因为我在嵌套 $(foreach...) 和 $(call...) 函数时犯了错误。

最小示例

项目层次结构

.
├── Makefile
├── data
│   ├── processed
│   └── raw
│       ├── annotations.csv
│       └── observations.csv
└── src
    ├── init.py
    └── parser.py

Makefile

#  targets
#  lauch_code
#  code_prereq
#  data_prereq
#  arguments
# Blank line at the beginning to have line breaks in $(foreach ...)!
define conprod

:   
    mkdir -p $(dir )
    python3  \
        $(foreach dp, , --consume $(dp)) \
        $(foreach t, , --produce $(t)) \
        
endef


params = 60 600
define target_pattern
data/processed/resam_$(param)s/annotated_observations.csv
endef
launch_code = src/parser.py
code_prereq =
data_prereq = data/raw/observations.csv data/raw/annotations.csv

$(info Info start)
$(info $(foreach param,$(params),$(call conprod,$(call target_pattern,$(param)),$(launch_code),$(code_prereq),$(data_prereq),$(param))))
$(info Info end)

$(foreach param,$(params),$(call conprod,$(call target_pattern,$(param)),$(launch_code),$(code_prereq),$(data_prereq),$(param)))

.PHONY: data
data: $(foreach param,$(params),$(call target_pattern,$(param)))

控制台输出

/mnt/c/Users/Public/dummy_projects/minimake$ make data -Bnd
GNU Make 4.2.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Reading makefiles...
Reading makefile 'Makefile'...
Info start

data/processed/resam_60s/annotated_observations.csv: src/parser.py  data/raw/observations.csv data/raw/annotations.csv
        mkdir -p data/processed/resam_60s/
        python3 src/parser.py  --consume data/raw/observations.csv  --consume data/raw/annotations.csv  --produce data/processed/resam_60s/annotated_observations.csv 60
data/processed/resam_600s/annotated_observations.csv: src/parser.py  data/raw/observations.csv data/raw/annotations.csv
        mkdir -p data/processed/resam_600s/
        python3 src/parser.py  --consume data/raw/observations.csv  --consume data/raw/annotations.csv  --produce data/processed/resam_600s/annotated_observations.csv 600
Info end
Makefile:29: *** multiple target patterns.  Stop.

潜在客户

我可以排除的可能原因：

缩进是 IDE 中的制表符（适用于其他目标）
子系统内的文件路径不包含冒号（如控制台输出所示）

“隐形”东西

由于$(foreach ...)生成的字符串，行尾有一个空格（分别在参数60或600之后）

Answer 1

我要冒险，猜想你是 Make 的新手。

如果我能猜出你真正想要什么，它看起来就像

params := 60 600
.PHONY: all data
all: data
data: $(patsubst %,data/processed/resam_%/annotated_observations.csv,$(params))

data/processed/resam_%/annotated_observations.csv: src/parser.py data/raw/observations.csv data/raw/annotations.csv
    mkdir -p data/processed/resam_$*
    python3 $< $(patsubst %,--consume %,$(filter-out $<,$^)) --produce $@ $*

（Stack Overflow 将制表符呈现为空格，因此您无法 copy/paste 不经修改直接将其放入您的 Makefile 中。）

这还是很笨拙的；通过避免讨厌的深层子目录结构，您可能可以将其重构为更简单、更优雅的东西。

GNU make: nesting of $(foreach...) and $(call...) produces Error: *** multiple target patterns. Stop

GNU make: nesting of $(foreach...) and $(call...) produces Error: *** multiple target patterns. Stop

makefile

metaprogramming

gnu-make

template-meta-programming

问题

最小示例

项目层次结构

Makefile

控制台输出

潜在客户

我可以排除的可能原因：

“隐形”东西