使用gcc，我无法获得第三方库，Cairo，链接/编译 [英] Using gcc, I am unable to get 3rd party library, Cairo, to link/compile

问题描述

显示的错误是未定义的符号，而不是我从示例复制的Cairo函数，但我猜测是内部函数。我已经环顾四周并尝试使用$（pkg-config --cflags --libs cairo），从一个常见的在线示例使用终端逐字处理。

The errors that show up are for undefined symbols, not the Cairo functions I copied from the example, but what I guess are internal functions. I have looked around and tried using $(pkg-config --cflags --libs cairo), verbatim from a common online example using the terminal.

使用EXPORT =（我的路径到cairos .ps文件）。

I tried that after using EXPORT=(my path to cairos .ps file).

我在链接器设置中的CodeBlocks'Link Libraries'目前有一个选项：
/usr/lib/x86-linux-gnu/libcairo.a

I currently have one option in CodeBlocks 'Link Libraries' in the linker settings: /usr/lib/x86-linux-gnu/libcairo.a

此外，我有 / usr / include / cairo 在我的编译器选项中。

Also, I have /usr/include/cairo in my compiler options.

错误：

/usr/lib/x86_64-linux-gnu/libcairo.a（cairo-image-source.o）||在函数 _cairo_image_source_finish'：|
（.text + 0x1c）||未定义的引用 pixman_image_unref'|

/usr/lib/x86_64-linux-gnu/libcairo.a(cairo-image-source.o)||In function _cairo_image_source_finish':| (.text+0x1c)||undefined reference topixman_image_unref'|

这是由以下main.c生成的：

Which are generated from the following, main.c:

include cairo.h (with # and <>)

int main()
{

    cairo_surface_t *surface =
        cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 240, 80);
    cairo_t *cr =
        cairo_create (surface);

    cairo_select_font_face (cr, "serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
    cairo_set_font_size (cr, 32.0);
    cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
    cairo_move_to (cr, 10.0, 50.0);
    cairo_show_text (cr, "Hello, world");

    cairo_destroy (cr);
    cairo_surface_write_to_png (surface, "hello.png");
    cairo_surface_destroy (surface);

    return 0;
}

任何帮助修复和了解非常感谢。
感谢。

Any help fixing and understanding what's going on would be greatly appreciated. Thanks.

推荐答案

所以这个问题的解决方案如下：

So the solution for this problem was as follows:

对所有正确的包含使用pkg-config。通过添加以下操作自动执行此操作：

pkg-config --cflags --libs cairo （由`

Use pkg-config for all the correct includes. Do so automatically by adding:

pkg-config --cflags --libs cairo (surrounded by " ` ", on the tilde key.)

to my "Other options" tab in the compiler settings.

我对链接器其他选项选项卡使用了以下命令：

pkg-config --libs cairo （也被`包围，重音符号）

I did the same for the linker "Other options" tab using:

pkg-config --libs cairo (also surrounded by " ` ", the accent grave)

和编译没有错误，但是当我运行它，我看不到任何东西，但一个空的控制台窗口：/

Now I build and compile with no errors, but when I run it, I don't see anything but an empty console window : /

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