在FreeBSD下的错误目录中启动

从FreeBSD make 手册页:

.OBJDIR      A path to the directory where the targets are built.  Its
             value is determined by trying to chdir(2) to the follow-
             ing directories in order and using the first match:

             1.   ${MAKEOBJDIRPREFIX}${.CURDIR}

              (Only if `MAKEOBJDIRPREFIX' is set in the environ-
              ment or on the command line.)

             2.   ${MAKEOBJDIR}

              (Only if `MAKEOBJDIR' is set in the environment or
              on the command line.)

             3.   ${.CURDIR}/obj.${MACHINE}

             4.   ${.CURDIR}/obj

             5.   /usr/obj/${.CURDIR}

             6.   ${.CURDIR}

             Variable expansion is performed on the value before it's
             used, so expressions such as
               ${.CURDIR:S,^/usr/src,/var/obj,}
             may be used.  This is especially useful with
             `MAKEOBJDIR'.

             `.OBJDIR' may be modified in the makefile via the special
             target `.OBJDIR'.  In all cases, make will chdir(2) to
             the specified directory if it exists, and set `.OBJDIR'
             and `PWD' to that directory before executing any targets.

在所有情况下,如果指定目录存在,则将chdir(2)设置为指定目录,并将其设置为 .OBJDIR'

相比之下 GNU make manual page OBJDIR

解决方案是覆盖 通过伪目标的变量 .OBJDIR

.OBJDIR: ./

all:
    cd src && make
clean:
    cd src && make clean

另一种解决方案是在 cd 具有的目标 ${CURDIR} ,在 chdir 进入

我不明白为什么 gmake 然而,他们的行为方式是一样的。对我来说,这感觉就像一个虫子。