交叉编译-Autotools交叉编译和生成的源

我正在尝试使用自动工具(autoconf,automake,libtool)作为构建系统来创建一个库.库必须是可交叉编译的,但是构建库的步骤之一是在整个过程中通过从源代码构建的可执行文件生成源代码.

问题是我不能使用automake的系统来构建中间二进制文件,因为当它被交叉编译时,它不会在’–build’上运行以生成源代码.

解决该问题的一种方法是创建单独的autools项目以构建中间二进制文件,但我想避免使用它,因为中间可执行文件和最终库有许多通用的标头和其他“数据”文件,因此我想将其保存在一个位置,除了那些中间的二进制文件应该是“ noinst”.

还有其他方法可以使其正常工作并保持可移植性吗?我试图使用ax_prog_cxx_for_build,但在交叉编译时找不到–build的EXEEXT.

这是一个问题的示例,仅用于说明我的问题:

configure.ac

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.68])
AC_INIT([libfoobar], [0.1.0], [<NOBUGS>])
AM_INIT_AUTOMAKE([foreign])
LT_INIT

AC_CONFIG_SRCDIR([src/bar.cpp])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_FILES([Makefile
                 src/Makefile])

# Checks for programs.
AC_PROG_CXX

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_OUTPUT

Makefile.am

ACLOCAL_AMFLAGS = -I m4

SUBDIRS = src

SRC / Makefile.am

bin_PROGRAMS = bar
lib_LTLIBRARIES = libfoo.la

noinst_bar_SOURCES = bar.cpp

libfoo_la_SOURCES = foo.cpp
nodist_libfoo_la_SOURCES = foobar.h

BUILT_SOURCES: foobar.h

foobar.h: bar$(EXEEXT) Makefile
    ./$< >$@
CLEANFILES = foobar.h

SRC / Foo.cpp中

#include "foobar.h"

extern "C" int foo() {
    return foobar_value;
}

SRC / bar.cpp

#include <iostream>

int main() {
    std::cout << "#ifndef FOOBAR_H" << std::endl;
    std::cout << "#define FOOBAR_H" << std::endl;
    std::cout << std::endl;
    std::cout << "static const int foobar_value = 0xdeadbeef;" << std::endl;
    std::cout << std::endl;
    std::cout << "#endif" << std::endl;
}
最佳答案
如果您使用的是AX_PROG_CXX_FOR_BUILD,则您应该使用的EXEEXT是BUILD_EXEEXT,它在宏AX_PROG_CC_FOR_BUILD中定义(AX_PROG_CXX_FOR_BUILD要求).对CXX_FOR_BUILD构建的东西使用EXEEXT将会是一个错误,因为那是主机工具链的扩展.因此,在这种情况下,您将需要更多类似的东西:

configure.ac

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.68])
AC_INIT([libfoobar], [0.1.0], [<NOBUGS>])
AM_INIT_AUTOMAKE([foreign])
LT_INIT
AC_CANONICAL_BUILD
AC_CANONICAL_HOST

AC_CONFIG_SRCDIR([src/bar.cpp])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_FILES([Makefile
                 src/Makefile])

# Checks for programs.
AC_PROG_CXX
AX_PROG_CXX_FOR_BUILD

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_OUTPUT

SRC / Makefile.am

noinst_PROGRAMS = bar
lib_LTLIBRARIES = libfoo.la

bar_SOURCES = bar.cpp

LINK_FOR_BUILD.cpp = $(CXX_FOR_BUILD) $(CXXFLAGS_FOR_BUILD) $(CPPFLAGS_FOR_BUILD) $(LDFLAGS_FOR_BUILD) $(TARGET_ARCH_FOR_BUILD)

bar$(BUILD_EXEEXT) : $(bar_OBJECTS)
            $(LINK_FOR_BUILD.cpp) $^ $(LOADLIBES_FOR_BUILD) $(LDLIBS_FOR_BUILD) -o $@

$(bar_OBJECTS) : CC=$(CC_FOR_BUILD)
$(bar_OBJECTS) : CXXFLAGS=$(CXXFLAGS_FOR_BUILD)
$(bar_OBJECTS) : CPPFLAGS=$(CPPFLAGS_FOR_BUILD)

libfoo_la_SOURCES = foo.cpp
nodist_libfoo_la_SOURCES = foobar.h

BUILT_SOURCES: foobar.h

foobar.h: bar$(BUILD_EXEEXT) Makefile
    ./$< >$@
CLEANFILES = foobar.h

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