使用gcc --shared -m64 -Wl, - whole-archive ./*.a从静态库创建动态库

Question

我收到这组gcc错误,我似乎无法从谷歌或手册页得到答案.任何洞察这些意味着什么或从哪里开始寻找？

这是makefile中的行:

#After building several otehr bits of code into static libraries
...
# Grand finally link all the object files into one
        gcc --shared  \
        -m64 \
        -Wl,--whole-archive ./release64/*.a \
        -o ./release64/libMYLIB.so.1.0
        ln -sf libArcGIS.so.1.0 ./release64/libMYLIB.so
        ln -sf libArcGIS.so.1.0 ./release64/libMYLIB.so.1

我得到了以下错误(还有更多我采取了前n只是为了给出一个想法:

/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_muldi3.o): In function `__multi3':
(.text+0x0): multiple definition of `__multi3'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_muldi3.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_negdi2.o): In function `__negti2':
(.text+0x0): multiple definition of `__negti2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_negdi2.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_lshrdi3.o): In function `__lshrti3':
(.text+0x0): multiple definition of `__lshrti3'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_lshrdi3.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ashldi3.o): In function `__ashlti3':
(.text+0x0): multiple definition of `__ashlti3'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ashldi3.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ashrdi3.o): In function `__ashrti3':
(.text+0x0): multiple definition of `__ashrti3'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ashrdi3.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_cmpdi2.o): In function `__cmpti2':
(.text+0x0): multiple definition of `__cmpti2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_cmpdi2.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ucmpdi2.o): In function `__ucmpti2':
(.text+0x0): multiple definition of `__ucmpti2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_ucmpdi2.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_clear_cache.o): In function `__clear_cache':
(.text+0x0): multiple definition of `__clear_cache'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_clear_cache.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_enable_execute_stack.o): In function `__enable_execute_stack':
(.text+0x0): multiple definition of `__enable_execute_stack'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_enable_execute_stack.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvsi2.o): In function `__absvsi2':
(.text+0x0): multiple definition of `__absvsi2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvsi2.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvsi2.o): In function `__absvdi2':
(.text+0x20): multiple definition of `__absvdi2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvsi2.o):(.text+0x20): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvdi2.o): In function `__absvti2':
(.text+0x0): multiple definition of `__absvti2'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_absvdi2.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_addvsi3.o): In function `__addvsi3':
(.text+0x0): multiple definition of `__addvsi3'
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_addvsi3.o):(.text+0x0): first defined here
/usr/lib/gcc/x86_64-redhat-linux/4.4.5/libgcc.a(_addvsi3.o): In function `__addvdi3':

---

更新

我想要组合的静态库是:

-rw-rw-r-- 1 mehoggan mehoggan  487770 Jan  3 11:17 libfreetype.a
-rw-rw-r-- 1 mehoggan mehoggan  227814 Jan  3 11:17 libjpeg.a
-rw-rw-r-- 1 mehoggan mehoggan  258576 Jan  3 11:17 libpng.a
-rw-rw-r-- 1 mehoggan mehoggan 2392136 Jan  3 11:17 libSkia.a
-rw-rw-r-- 1 mehoggan mehoggan  696756 Jan  3 11:17 libSQlite.a
-rw-rw-r-- 1 mehoggan mehoggan 1517832 Jan  3 11:16 libSymbolXLib.a
-rw-rw-r-- 1 mehoggan mehoggan  928934 Jan  3 11:17 libxml2.a

我对每个文件执行了单独的编译,因此没有执行任何链接.我查看了源代码,但没有看到任何涉及libgcc的内容.这就是为什么错误对我不起作用的原因.

Answer 1

你错过了收盘--no-whole-archive.那是

    gcc --shared  \
    -m64 \
    -Wl,--whole-archive ./release64/*.a -Wl,--no-whole-archive \
    -o ./release64/libMYLIB.so.1.0
    ln -sf libArcGIS.so.1.0 ./release64/libMYLIB.so
    ln -sf libArcGIS.so.1.0 ./release64/libMYLIB.so.1

如果没有关闭--no-whole-archive,初始化--whole-archive将影响传递给链接器的所有库,特别是libgcc,它总是隐式传递.这就是你得到重复符号的原因.

Answer 2

它的意思就是它所说的。有两个或多个 .a 文件包含 .o 文件，这些文件包含这些函数的定义。特别是，您的目录似乎包含 libgcc.a 的两个变体或包含其副本的内容。

根本不要对 libgcc.a 执行此操作。要省略 libgcc，请添加 -nostdlib 甚至 -nodefaultlibs。