libtool不提供要链接的库依赖项 [英] libtool doesn't provide library dependencies to link

问题描述

我在ubuntu lucid上使用libtool 2.2.6b，在ubuntu precision上使用libtool 2.4.2.清楚地讲，我的项目将正确链接.确切地说，它无法链接.这是演示我的问题的示例代码；

configure.ac

AC_INIT([ltp], [0.0.1], [someone])
AM_INIT_AUTOMAKE
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([.m4])
AC_CONFIG_FILES([Makefile foo/Makefile bar/Makefile wah/Makefile])
AC_PROG_CXX
AC_PROG_LIBTOOL
AM_SANITY_CHECK
AC_LANG_CPLUSPLUS
AC_OUTPUT

Makefile.am

SUBDIRS = foo bar wah
ACLOCAL_AMFLAGS = -I .m4

foo/Foo.h

#ifndef FOO_FOO_H_
#define FOO_FOO_H_
namespace Foo
{
  class Foo
  {
  public:
    Foo(long l);
  private:
    long l;
  };
}
#endif

foo/Foo.cpp

#include "foo/Foo.h"
namespace Foo
{
  Foo::Foo(long l) : l(l) {}
}

foo/Makefile.am

lib_LTLIBRARIES = libfoo.la
libfoo_la_SOURCES = Foo.cpp
libfoo_la_CPPFLAGS =
libfoo_la_LDFLAGS = -release 0.0.1
libfoo_la_LIBADD =

bar/Bar.h

#ifndef BAR_BAR_H_
#define BAR_BAR_H_
#include "foo/Foo.h"
namespace Bar
{
  class Bar
  {
  public:
    Bar(const Foo::Foo & f);
  private:
    Foo::Foo f;
  };
}
#endif

bar/Bar.cpp

#include "bar/Bar.h"
namespace Bar
{
  Bar::Bar(const Foo::Foo & f) : f(f) { }
}

bar/Makefile.am

lib_LTLIBRARIES = libbar.la
libbar_la_SOURCES = Bar.cpp
libbar_la_CPPFLAGS =
libbar_la_LDFLAGS = -release 0.0.1
libbar_la_LIBADD = -L../foo -lfoo

wah/main.cpp

#include "bar/Bar.h"
int main(int argc, char * argv[])
{
  Bar::Bar( 5 );
  return 0;
}

wah/Makefile.am

bin_PROGRAMS = wah
wah_SOURCES = main.cpp
wah_CPPFLAGS =
wah_LDADD = -L../bar -lbar

在Lucid上，哇链接，在Precise上，失败并显示:

wah/main.cpp:5 undefined reference to `Foo::Foo::Foo(long)'

我可以通过将-L../foo -lfoo添加到wah_LDADD来解决此问题，但实际上，libtool是否应该自动为我做到这一点?关于链接可执行文件"的libtool手册部分似乎表明这正是它应该做的.

解决方案

在我用于开发的任何Debian机器上，我都必须手工编译和安装Libtool，因为Debian提供的版本已打补丁并以某种方式忽略了依赖关系破坏了我的身材.

如果Ubuntu的版本与此类似，则您可能还想从源代码中安装Libtool ./p>

I am using libtool 2.2.6b on ubuntu lucid, and libtool 2.4.2 on ubuntu precise. On lucid my project will link properly. On precise it fails to link. Here's example code that demonstrates my problem;

configure.ac

AC_INIT([ltp], [0.0.1], [someone])
AM_INIT_AUTOMAKE
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([.m4])
AC_CONFIG_FILES([Makefile foo/Makefile bar/Makefile wah/Makefile])
AC_PROG_CXX
AC_PROG_LIBTOOL
AM_SANITY_CHECK
AC_LANG_CPLUSPLUS
AC_OUTPUT

Makefile.am

SUBDIRS = foo bar wah
ACLOCAL_AMFLAGS = -I .m4

foo/Foo.h

#ifndef FOO_FOO_H_
#define FOO_FOO_H_
namespace Foo
{
  class Foo
  {
  public:
    Foo(long l);
  private:
    long l;
  };
}
#endif

foo/Foo.cpp

#include "foo/Foo.h"
namespace Foo
{
  Foo::Foo(long l) : l(l) {}
}

foo/Makefile.am

lib_LTLIBRARIES = libfoo.la
libfoo_la_SOURCES = Foo.cpp
libfoo_la_CPPFLAGS =
libfoo_la_LDFLAGS = -release 0.0.1
libfoo_la_LIBADD =

bar/Bar.h

#ifndef BAR_BAR_H_
#define BAR_BAR_H_
#include "foo/Foo.h"
namespace Bar
{
  class Bar
  {
  public:
    Bar(const Foo::Foo & f);
  private:
    Foo::Foo f;
  };
}
#endif

bar/Bar.cpp

#include "bar/Bar.h"
namespace Bar
{
  Bar::Bar(const Foo::Foo & f) : f(f) { }
}

bar/Makefile.am

lib_LTLIBRARIES = libbar.la
libbar_la_SOURCES = Bar.cpp
libbar_la_CPPFLAGS =
libbar_la_LDFLAGS = -release 0.0.1
libbar_la_LIBADD = -L../foo -lfoo

wah/main.cpp

#include "bar/Bar.h"
int main(int argc, char * argv[])
{
  Bar::Bar( 5 );
  return 0;
}

wah/Makefile.am

bin_PROGRAMS = wah
wah_SOURCES = main.cpp
wah_CPPFLAGS =
wah_LDADD = -L../bar -lbar

On Lucid, wah links, on Precise, it fails with:

wah/main.cpp:5 undefined reference to `Foo::Foo::Foo(long)'

I can fix this by adding -L../foo -lfoo to wah_LDADD, but really, isn't libtool supposed to do that for me automagically? The libtool manual section on `Linking executables' seems to indicate that is exactly what it should do.

解决方案

On any Debian machine I use for development, I have to compile and install Libtool by hand, because the Debian-supplied version is patched and ignores dependencies in a way that break my builds.

If Ubuntu's version is similar, you might want to install Libtool from source too.

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