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m (added some information on DSO linking and corrected some typos)
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'''Note: gcc has upgraded from 4.4.2 to 4.4.3'''
 
'''Note: gcc has upgraded from 4.4.2 to 4.4.3'''
 
This includes gcc, gcc-c++, gcc-fortran, gcc-gnat, and gcc-objc.
 
This includes gcc, gcc-c++, gcc-fortran, gcc-gnat, and gcc-objc.
GCC now use DSO linking (Dynamic Shared Object linking)  
+
GCC now uses DSO linking (Dynamic Shared Object linking)  
  
  

Revision as of 21:34, 12 March 2010

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GCC upgraded in alpha

Note: gcc has upgraded from 4.4.2 to 4.4.3 This includes gcc, gcc-c++, gcc-fortran, gcc-gnat, and gcc-objc. GCC now uses DSO linking (Dynamic Shared Object linking)


Implicit DSO Linking Key points:

  1. ld will no longer automatically search in the dependencies of linked objects.
  2. If your project used both libraries A and B, it will not compile unless A and B are both explicitly linked.
  3. There are more explanations on the Features page. here

Under the new changes, if your package fails its build with a message like:

 /usr/bin/ld: gpx-parser.o: undefined reference to symbol 'acos@@GLIBC_2.0'
 /usr/bin/ld: note: 'acos@@GLIBC_2.0' is defined in DSO /lib/libm.so.6 so try adding it to the linker command line

Then the line that builds the specified .o needs to explicitly link libm.