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==GNU ar== |
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GNU ar is a utility that archives a series of files. It is used to take a group of files, and combine them all into one. This allows one to then compress, send, or most importantly and commonly, link the files into a program. |
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The tool itself is about as simple as its purpose. To archive a series of object files: |
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You have many object files and your linking line for a program in your OS grows longer and longer? GNU AR helps. |
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Then, to link against them: |
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It creates archives of object files alongside with a table of the symbols, which each object file (==member) sports. |
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cc example.c archive.a -o example.bin |
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| ⚫ | '''Important''': If you link other object files besides the library ''archive.a'', take care that the ''archive.a'' is right behind these object files (or have it be the very last file in the list of files to link) - so the linker can resolve the one or other occurrence of a symbol which is covered by some member of the ''archive.a'' library. |
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==See Also== |
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You link your program's object file against =crt0.o= and the =archive.a= file. |
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| ⚫ | Important: If you link other object files besides the library |
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Revision as of 04:22, 7 July 2007
GNU ar
GNU ar is a utility that archives a series of files. It is used to take a group of files, and combine them all into one. This allows one to then compress, send, or most importantly and commonly, link the files into a program.
The tool itself is about as simple as its purpose. To archive a series of object files:
ar -rcs archive.a obj_fil1.o obj_fil2.o obj_fil3.o obj_fil4.o ... obj_filN.o
Then, to link against them:
cc example.c archive.a -o example.bin
Important: If you link other object files besides the library archive.a, take care that the archive.a is right behind these object files (or have it be the very last file in the list of files to link) - so the linker can resolve the one or other occurrence of a symbol which is covered by some member of the archive.a library.