https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230492
Bug ID: 230492
Summary: make: -C options doesn't work as explained in man page
about value of ${.CURDIR} when logical and physical
directory are different.
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
In the man page of make(1) '-C' options is explained as following.
----------------------------------------------------------------------
-C directory
Change to directory before reading the makefiles or doing
anything else. If multiple -C options are specified, each is
interpreted relative to the previous one: -C / -C etc is
equivalent to -C /etc.
----------------------------------------------------------------------
This means 'make -C /foo/bar/baz' works same as 'cd /foo/bar/baz; make'.
But there is an case that make doesn't behaves so. As explained in summary it
is about value of ${.CURDIR} and happens when logical and physical directory
are different.
Let me explain it by providing an example.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[2018]% pwd
/home/yasu/tmp
yasu@rolling-vm-freebsd1[2019]% ls -l
total 1
lrwxr-xr-x 1 yasu user 3 8月 10 08:21 bar@ -> foo
drwxr-xr-x 2 yasu user 3 8月 10 08:20 foo/
----------------------------------------------------------------------
/home/yasu/tmp/foo is real directory and /home/yasu/tmp/bar is symbolic link to
it. So logical and physical expression of /home/yasu/tmp/bar is different.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[2020]% cd /home/yasu/tmp/bar
yasu@rolling-vm-freebsd1[2021]% /bin/pwd -L
/home/yasu/tmp/bar
yasu@rolling-vm-freebsd1[2022]% /bin/pwd -P
/home/yasu/tmp/foo
----------------------------------------------------------------------
And there is following Makefile under /home/yasu/tmp/bar.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[2023]% cat Makefile
~/tmp/bar
all:
@echo ${.CURDIR}
----------------------------------------------------------------------
It simply displays value of ${.CURDIR}.
Now let's execute make without any arguments. It causes following result.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[2024]% make
~/tmp/bar
/home/yasu/tmp/foo
----------------------------------------------------------------------
Physical expression of current working directory is displayed.
Next, let's execute make with -C options and logical expression of current
working directory. In this case it result as following.
----------------------------------------------------------------------
yasu@rolling-vm-freebsd1[2025]% make -C /home/yasu/tmp/bar
~/tmp/bar
/home/yasu/tmp/bar
----------------------------------------------------------------------
If '-C' options works exactly as explained in man page, same value as previous
execution, that is, physical expression of current working directory should be
displayed. Actually, however, what is displayed is logical expression of
current working directory. This means '-C' option doesn't work as explained in
man page.
I confirmed it happens on both 11.2-RELEASE and 12.0-CURRENT (r337160).
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