如何使用 automake 检查 OS

How to check the OS with automake

我有一个项目使用 automake 创建 configure 和所有相关文件(我正在使用 autoreconf 命令来制作所有这些东西)。因此,我试图在项目为 macOS (OS X)、Windows 或 Linux 编译时设置一些条件文件进行编译。但它失败了:

 $ autoreconf -i ..
src/Makefile.am:30: error: LINUX does not appear in AM_CONDITIONAL
autoreconf: automake failed with exit status: 1

包含 Makefile.am 错误的部分如下:

if OSX
    butt_SOURCES += CurrentTrackOSX.h CurrentTrackOSX.m
endif
if LINUX
    butt_SOURCES += currentTrack.h currentTrackLinux.cpp
endif
if WINDOWS
    butt_SOURCES += currentTrack.h currentTrack.cpp
endif

我的问题是,如何检查 OS 是否为 Linux?如果可能的话,有没有更好的方法来检查 automake 中的 OS?

您是否尝试过使用lsb_release命令来确定操作系统的类型和版本?

您可以检测到它 directly in the Makefile,或者在配置源文件中定义条件(可能 configure.ac),因为您使用的是 autoreconf:

# AC_CANONICAL_HOST is needed to access the 'host_os' variable    
AC_CANONICAL_HOST

build_linux=no
build_windows=no
build_mac=no

# Detect the target system
case "${host_os}" in
    linux*)
        build_linux=yes
        ;;
    cygwin*|mingw*)
        build_windows=yes
        ;;
    darwin*)
        build_mac=yes
        ;;
    *)
        AC_MSG_ERROR(["OS $host_os is not supported"])
        ;;
esac

# Pass the conditionals to automake
AM_CONDITIONAL([LINUX], [test "$build_linux" = "yes"])
AM_CONDITIONAL([WINDOWS], [test "$build_windows" = "yes"])
AM_CONDITIONAL([OSX], [test "$build_mac" = "yes"])

Note: host_os refers to the target system, so if you are cross-compiling it sets the OS conditional of the system you are compiling to.