Can GCC compiler compile both Objective-C and C code?

Can GCC compiler compile both Objective-C and C code?

References

Reference NO 1

http://stackoverflow.com/questions/15197359/can-gcc-compiler-compile-both-objective-c-and-c-code

Reference NO 2

http://gcc.gnu.org/onlinedocs/gcc/Objective_002dC-and-Objective_002dC_002b_002b-Dialect-Options.html

Reference NO 3

http://codeseekah.com/2012/09/12/compiling-objective-c-without-a-gui/

Reference NO 4

http://www.informit.com/articles/article.aspx?p=1315356

Reference NO 5

http://www.linuxforums.org/forum/programming-scripting/101326-how-2-compile-objective-c-using-gcc-compiler.html

Reference NO 6

http://ubuntuforums.org/showthread.php?t=1064045

Reference NO 7

http://en.wikipedia.org/wiki/Objective-C

Reference NO 8

http://wiki.codeblocks.org/index.php?title=Installing_Objective-C_Compiler