问题描述
我想为大量目标（单元测试C ++文件）设置相同的LDADD属性（单元测试库）。我首先虽然也许automake有AM_LDADD变量添加该库到文件中的所有目标，但不是这样。
在某些邮件列表中，我发现了一些简短的讨论，要求添加它：
I want to set the same LDADD attribute (Unit test library) to a large number of targets (unit test C++ files). I first though that maybe automake has AM_LDADD variable to add that library to all the targets within the file but is not the case.In some mail list I found some short discussion asking to add it:http://gnu-automake.7480.n7.nabble.com/AM-LIBS-AM-LDADD-td3698.html
我的问题是，你如何处理？是否有任何方法避免手动添加LDADD属性到每个目标？
My question is, how do you deal with that? is it there any way to avoid manually adding LDADD attribute to each target?
到目前为止，我的Makefile.am看起来像：
So far my Makefile.am looks like:
test1_SOURCES = ...
test1_LDADD = -llibrary
...
...
test20_SOURCES = ...
test20_LDADD = -llibrary
推荐答案
AM_LDADD 变量只是。例如
The equivalent of an AM_LDADD variable is simply LDADD. e.g.,
LDADD = -llibrary
test1_SOURCES = ...
...
test20_SOURCES = ...
如果您需要覆盖 LDADD 对于特定程序： prog ，那么 prog_LDADD 将始终优先。
If you need to override LDADD for a particular program: prog, then prog_LDADD will always take precedence.
我总是假定因为没有 LDADD 标准环境变量传递到 configure - 你可以看到 configure --help - 没有真正的原因，一个 AM_LDADD 。这种方式有意义，因为 configure 脚本和任何选项，例如 - with-foo =< path>
I always assumed that since there was no LDADD standard environment variable passed to configure - as you can see with configure --help - there is no real reason for an AM_LDADD. This kind of makes sense, as the configure script, and any options, e.g., --with-foo=<path> should (ideally) work out the library dependencies.
另一方面，传递 CFLAGS via configure 可能仍需要一个 AM_CFLAGS ，它结合了 CFLAGS 编译器标志由configure脚本决定;或者甚至是 foo_CFLAGS 覆盖。由于配置必须通知您的自定义 CFLAGS 。
On the other hand, passing CFLAGS via configure might still need an AM_CFLAGS that combines CFLAGS and with other compiler flags determined by the configure script; or even a foo_CFLAGS override. Since configure must be informed of your custom CFLAGS.
此外，我不知道 test< n> 程序是否只有一个C ++源文件， ，您可以简化 Makefile.am ：
Also, I don't know if the test<n> programs only take a single C++ source file, but if so, you can simplify the Makefile.am with:
LDADD = -llibrary
check_PROGRAMS = test1 test2 ... test20
AM_DEFAULT_SOURCE_EXT = .cc # or .cpp
（如所述） 。
对于您的评论，您可以使用，对于测试程序使用的常用代码尤其有用：
In regards to your comment, your can use a convenience library for that purpose - which is particularly useful for common code used by test programs:
noinst_LIBRARIES = libfoo.a # or noinst_LTLIBRARIES = libfoo.la
libfoo_a_SOURCES = MyClass.hh MyClass.cc # or libfoo_la_SOURCES
LDADD = ./libfoo.a -llibrary # or libfoo.la if using libtool.
... etc ...
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