CODEWITHSUNDEEP
clibclang
kfc9001
kfc9001

Reputation: 41

Statically linking libclang in C code

I'm trying to write a simple syntax checker for C code using the frontend available in libclang. Due to deployment concerns, I need to be able to statically link all the libraries in libclang, and not pass around the .so file that has all the libraries.

I'm building clang/llvm from source, and in llvm/Release+Asserts/lib I have a bunch of .a files that I think I should be able to use, but it never seems to work (the linker spews out thousands of errors about missing symbols). However, when I compile it using the libclang.so also present in that directory as follows:

clang main.c -o bin/dlc -I../llvm/tools/clang/include -L../llvm/Release+Asserts/lib/ -lclang

Everything seems to work well.

What is the minimum set of .a files I need to include to make this work? I've tried including absolutely all of the .a files in the build output directory, with them provided to clang/gcc in different orders, without any success. I only need the functions mentioned in libclang's Index.h, but there don't seem to be any resources or documentation on what the various libclang*.a files are for. It would be very helpful to know which files libclang.so pulls in.

Upvotes: 4

Views: 4224

Answers (1)

hdante
hdante

Reputation: 8020

The following is supposed to work, as long the whole project has all static libraries (I counted 116 in my Release/lib directory).

clang main.c -o bin/dlc -I../llvm/tools/clang/include ../llvm/Release/lib/*.a

[edit: clang main.c -o bin/dlc -I../llvm/tools/clang/include ../llvm/Release/lib/libclang.a ../llvm/Release/lib/*.a]

Note that the output binary is not static, so you don't need any -static flag for gcc or ld, if you're using this syntax.

If that doesn't work you might need to list the libraries in order: if some library requires a function available in another library, then it may be necessary to list it first in the command line. See comments about link order at: http://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Link-Options.html#Link-Options

Upvotes: 1

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