[英]Calling a GNU ar script in Makefile
I'm having some trouble using GNU ar script from a Makefile.我在使用来自 Makefile 的 GNU ar脚本时遇到了一些麻烦。 Specifically, I'm trying to follow an answer to How can I combine several C/C++ libraries into one?
具体来说,我正在尝试遵循如何将多个 C/C++ 库合并为一个的答案? , but ar scripting isn't well supported by
make
, as most Makefiles use the ar
command-line interface and not a script. ,但是
make
不能很好地支持 ar 脚本,因为大多数 Makefile 使用ar
命令行界面而不是脚本。 ar
needs each line to be terminated by a new line ( \n
). ar
需要每行以新行( \n
)终止。 This is not the same as multiple shell commands which can use a semicolon as a separator.这与可以使用分号作为分隔符的多个 shell 命令不同。
The ar commands are: ar 命令是:
ar -M <<CREATE libab.a
ADDLIB liba.a
ADDLIB libb.a
SAVE
END
ranlib libab.a
I'm trying to merge the libraries because I'm creating a static library in a Makefile which depends on another static library, but the second one is created with CMake. I'm trying to merge the libraries because I'm creating a static library in a Makefile which depends on another static library, but the second one is created with CMake.
foo.a: foo.o
$(AR) $(ARFLAGS) $@ $^
final_lib.c: foo.a the_cmake_library.a
$(AR) -M <<CREATE $@
ADDLIB foo.a
ADDLIB the_cmake_library.a
SAVE
END
ranlib $@
The above doesn't work because make
is interpreting the ar
commands as its own, so I'm getting a以上不起作用,因为
make
将ar
命令解释为它自己的命令,所以我得到了
make: CREATE: Command not found
If these were bash commands, I could use something like this answer , but that doesn't work:如果这些是 bash 命令,我可以使用类似这个答案的东西,但这不起作用:
ar -M <<CREATE libab.a; ADDLIB liba.a; ADDLIB libb.a; SAVE; END
ar
doesn't have a command-line version of the ADDLIB
command. ar
没有ADDLIB
命令的命令行版本。
My current solution is:我目前的解决方案是:
final_lib.c: foo.a the_cmake_library.a
$(shell printf "EOM\nCREATE $@\nADDLIB foo.a\nADDLIB the_cmake_library.a\nSAVE\nEND\nEOM\n" > ARCMDS.txt)
$(AR) -M < ARCMDS.txt
ranlib $@
I find that very clumsy.我觉得这很笨拙。 Does anyone know of a better way to handle
ar
scripts in a Makefile?有谁知道在 Makefile 中处理
ar
脚本的更好方法? Thanks!谢谢!
You don't need to use the shell
function and you don't need to write it to a file.您不需要使用
shell
function 也不需要将其写入文件。 ar
is taking from stdin anyway so why not just use a pipe? ar
无论如何都是从标准输入中获取的,那么为什么不只使用 pipe 呢?
Either:任何一个:
final_lib.c: foo.a the_cmake_library.a
printf "EOM\nCREATE $@\nADDLIB foo.a\nADDLIB the_cmake_library.a\nSAVE\nEND\nEOM\n" | $(AR) -M
ranlib $@
Or something like:或类似的东西:
final_lib.c: foo.a the_cmake_library.a
(echo EOM; \
echo "CREATE $@"; \
echo ADDLIB foo.a; \
echo ADDLIB the_cmake_library.a; \
echo SAVE; \
echo END; \
echo EOM) \
| $(AR) -M
ranlib $@
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