pkg-config无法在sysroot目录下找到软件包 [英] pkg-config fails to find package under sysroot directory

问题描述

谁能告诉我为什么这可能会失败:

Can anyone please tell me why this might fail:

afeder@ubuntu:~/android/toolchain/sysroot$ ls $PKG_CONFIG_SYSROOT_DIR/usr/local/lib/pkgconfig/mozjs185.pc
/home/afeder/android/toolchain/sysroot/usr/local/lib/pkgconfig/mozjs185.pc

afeder@ubuntu:~/android/toolchain/sysroot$ pkg-config mozjs185 --cflags
Package mozjs185 was not found in the pkg-config search path.
Perhaps you should add the directory containing `mozjs185.pc'
to the PKG_CONFIG_PATH environment variable
No package 'mozjs185' found

根据man pkg-config(1) ，/usr/local/lib/pkgconfig应该是默认的搜索路径之一.

According to man pkg-config(1), /usr/local/lib/pkgconfig is supposed to be one of the default search paths.

推荐答案

我在这里找到了答案: http://www.flameeyes.eu/autotools-mythbuster/pkgconfig/cross-compiling.html

I found the answer here: http://www.flameeyes.eu/autotools-mythbuster/pkgconfig/cross-compiling.html

包装脚本不仅应设置PKG_CONFIG_SYSROOT_DIR 变量:交叉编译时，您想忽略软件包 安装在系统中，而是仅依赖于安装在系统中的那些 交叉编译的环境.这可以通过重置来实现 PKG_CONFIG_DIR(列出其他搜索路径)，并且在同一位置 时间设置PKG_CONFIG_LIBDIR以覆盖默认的基本搜索 路径.

The wrapper script should not only set the PKG_CONFIG_SYSROOT_DIR variable: when cross-compiling you want to ignore the packages installed in the system, and instead rely only on those installed in the cross-compiled environment. This is achieved by resetting PKG_CONFIG_DIR (which lists additional search paths), and at the same time setting PKG_CONFIG_LIBDIR to override the default base search paths.

---

生成的CMake文件将如下所示:

---

The resulting CMake File would be something like this:

set(CMAKE_SYSROOT "/path/to/sysroot")

set(ENV{PKG_CONFIG_DIR} "")
set(ENV{PKG_CONFIG_LIBDIR} "${CMAKE_SYSROOT}/usr/lib/pkgconfig:${CMAKE_SYSROOT}/usr/share/pkgconfig")
set(ENV{PKG_CONFIG_SYSROOT_DIR} ${CMAKE_SYSROOT})

免责声明:我使用了CMAKE_SYSROOT变量，当您要将-sysroot传递给g++时，该变量很有用.如果您不希望这样做，则应使用其他名称来命名变量.

Disclaimer: I used the CMAKE_SYSROOT variable which is useful when you want to pass -sysroot to g++. If you don't want this you should name your variable differently.

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