我正在尝试学习gobject系统,所以我阅读了gnome网站上的一些文档,并为GObject创建了一个简单的gobject。每次我想编译时,我都不想继续运行gcc
作业,我也想同时学习构建系统。我尝试了autotools,我开始工作到pkg-config
搜索gobject-2.0的程度。
要从命令行编译我的项目,我这样做:gcc *.c $(pkg-config --cflags --libs gobject-2.0)
(我必须取出格式的额外刻度)。无论如何< ---这个命令有效。
然而:gcc $(pkg-config --cflags --libs gobject-2.0) *.c
,它应该是同一个命令,返回:
main.c: In function 'main':
main.c:10:10: warning: initialization from incompatible pointer type [enabled by default]
/tmp/ccxO7wkX.o: In function `main':
main.c:(.text+0x1a): undefined reference to `g_type_init'
main.c:(.text+0x27): undefined reference to `g_type_create_instance'
/tmp/ccPu2beU.o: In function `a_get_type':
myobject.c:(.text+0x57): undefined reference to `g_type_register_static'
collect2: ld returned 1 exit status
是的,这是与另一个命令完全相同的命令。我不知道出了什么问题。以下是autotools / automake的构建方式:
gcc -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -lgobject-2.0 -lglib-2.0 -o GObjectTest main.o myobject.o
main.o: In function `main':
/home/aj/Desktop/GObjectTest/src/main.c:9: undefined reference to `g_type_init'
/home/aj/Desktop/GObjectTest/src/main.c:10: undefined reference to `g_type_create_instance'
myobject.o: In function `a_get_type':
/home/aj/Desktop/GObjectTest/src/myobject.c:19: undefined reference to `g_type_register_static'
collect2: ld returned 1 exit status
make: *** [GObjectTest] Error 1
这是一些古怪的gcc编译事吗?我试过clang也无济于事,这让我觉得这是一个链接器问题?我真的不知道,并希望有人会在那里。这非常令人沮丧。
以下是“违规代码”:
GType a_get_type (void)
{
if (type == 0) {
GTypeInfo info = {
sizeof(AClass),
NULL,
NULL,
(GClassInitFunc) a_class_init,
NULL,
NULL,
sizeof(A),
0,
(GInstanceInitFunc) NULL
};
type = g_type_register_static (G_TYPE_OBJECT,
"AType",
&info, 0);
}
return type;
}
编辑:这是我的autotools构建的输出,无论如何是make部分:
$ make
make all-recursive
make[1]: Entering directory `/home/aj/Desktop/GObjectTest'
Making all in src
make[2]: Entering directory `/home/aj/Desktop/GObjectTest/src'
gcc -DHAVE_CONFIG_H -I. -I.. -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -MT main.o -MD -MP -MF .deps/main.Tpo -c -o main.o main.c
main.c: In function 'main':
main.c:10:10: warning: initialization from incompatible pointer type [enabled by default]
mv -f .deps/main.Tpo .deps/main.Po
gcc -DHAVE_CONFIG_H -I. -I.. -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -MT myobject.o -MD -MP -MF .deps/myobject.Tpo -c -o myobject.o myobject.c
mv -f .deps/myobject.Tpo .deps/myobject.Po
gcc -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -lgobject-2.0 -lglib-2.0 -o GObjectTest main.o myobject.o
main.o: In function `main':
/home/aj/Desktop/GObjectTest/src/main.c:9: undefined reference to `g_type_init'
/home/aj/Desktop/GObjectTest/src/main.c:10: undefined reference to `g_type_create_instance'
myobject.o: In function `a_get_type':
/home/aj/Desktop/GObjectTest/src/myobject.c:19: undefined reference to `g_type_register_static'
collect2: ld returned 1 exit status
make[2]: *** [GObjectTest] Error 1
make[2]: Leaving directory `/home/aj/Desktop/GObjectTest/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/aj/Desktop/GObjectTest'
make: *** [all] Error 2
以下是有趣的部分:将gcc -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -lgobject-2.0 -lglib-2.0 -o GObjectTest main.o myobject.o
替换为gcc -o GObjectTest main.o myobject.o -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -g -O2 -lgobject-2.0 -lglib-2.0
并且它有效。