问题描述
我正在尝试使用 cygwin 编译在 os x 和 linux 上运行的代码.但是,我发现 gcc 的参数顺序给出了意想不到的结果.
I am trying to compile code that works on os x and linux using cygwin. However, I am finding that the argument order to gcc gives unanticipated results.
例如,以下失败:
gcc -std=gnu99 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lglib-2.0 -lintl -liconv -fgnu89-inline -fno-leading-underscore -o nb-learn.exe nb-learn.c
但以下有效:
gcc -std=gnu99 -fgnu89-inline -fno-leading-underscore -o nb-learn.exe nb-learn.c -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lglib-2.0 -lintl -liconv
有人可以解释一下这是如何工作的吗?另外,是否有我可以查看的技术或代码来让 autoconf 根据平台更改参数顺序?
Can someone explains how this works? Also, are there techniques or code I can look at for getting autoconf to change the argument order depending on the platform?
这是错误信息的前两行:
Here are the first two lines of the error message:
/cygdrive/c/Users/aischein/AppData/Local/Temp/cc9MvUsf.o:nb-learn.c:(.text+0x260): undefined reference to `_g_hash_table_size'
/cygdrive/c/Users/aischein/AppData/Local/Temp/cc9MvUsf.o:nb-learn.c:(.text+0x29c): undefined reference to `_g_hash_table_get_keys'
谢谢,
设置Jmp(gcc 4.3.4)
SetJmp(gcc 4.3.4)
推荐答案
-l
库
-l
库
链接时搜索名为library的库.(将库作为单独参数的第二种选择仅适用于 POSIX 合规性,不推荐使用.)
Search the library named library when linking. (The second alternative with the library as a separate argument is only for POSIX compliance and is not recommended.)
在命令中编写此选项的位置有所不同;链接器按照指定的顺序搜索和处理库和目标文件.
It makes a difference where in the command you write this option; the linker searches and processes libraries and object files in the order they are specified.
因此,`foo.o -lz bar.o
' 在文件 foo.o
之后但在 之前搜索库`
.如果 z
'>bar.obar.o
引用了 `z
' 中的函数,这些函数可能不会被加载.
Thus, `foo.o -lz bar.o
' searches library `z
' after file foo.o
but before bar.o
. If bar.o
refers to functions in `z
', those functions may not be loaded.
-Wl,--start-group
和 -Wl,--end-group
选项有时对于避免此类问题很有用.
-Wl,--start-group
and -Wl,--end-group
options are useful sometimes for avoiding such problems.
如果您只使用共享库,所有这些都不是问题.
All this isn't a problem if you use only shared libraries.
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