如何解决gcc linux中的多个定义错误？
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How to solve Multiple definition errors in gcc linux?
提问by SunnyShah
I am facing below errors when trying to statically link libDuma, Can you tell me how to ask g++ to use malloc from libDuma?
我在尝试静态链接 libDuma 时遇到以下错误，你能告诉我如何让 g++ 使用 libDuma 中的 malloc 吗？
sunny@sunny-laptop:~/CodeTest$ g++ ./testDuma.cpp -g -o testDuma -static -lduma -pthread
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libc.a(malloc.o): In function `free':
(.text+0x4b00): multiple definition of `free'
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libduma.a(duma.o):(.text+0x25f0): first defined here
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libc.a(malloc.o): In function `malloc':
(.text+0x4bc0): multiple definition of `malloc'
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libduma.a(duma.o):(.text+0x2730): first defined here
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libc.a(malloc.o): In function `realloc':
(.text+0x5950): multiple definition of `realloc'
/usr/lib/gcc/i686-linux-gnu/4.4.5/../../../../lib/libduma.a(duma.o):(.text+0x23d0): first defined here
collect2: ld returned 1 exit status
采纳答案by Employed Russian
Don't force a completely static link (don't use the -staticflag) -- doing so on any modern UNIX system is an extremely bad idea(TM).
不要强制建立一个完全静态的链接（不要使用-static标志）——在任何现代 UNIX 系统上这样做都是一个非常糟糕的主意 (TM)。
Instead, link just the libduma statically. Either of these commands should work:
相反，只静态链接 libduma。这些命令中的任何一个都应该有效：
g++ ./testDuma.cpp -g -pthread -o testDuma /path/to/libduma.a
g++ ./testDuma.cpp -g -pthread -o testDuma -Wl,-Bstatic -lduma -Wl,-Bdynamic
回答by Piotr Praszmo
Add -nodefaultlibsflag to not link to libc. Or, remove -ldumaand link it dynamically after compilation with:
添加-nodefaultlibs标志以不链接到 libc。或者，-lduma在编译后动态删除并链接它：
LD_PRELOAD=/usr/lib/libduma.so ./testDuma
