Bug 5560 – unittests add code size when compiling with -lib and without -unittest

When compiling a lib with that has unit tests, but without -unittest, each unit test for some reason adds a small amount of space. For example: lib1.d: void foo() {} lib2.d: void foo() {} unittest {} lib3.d void foo() {} unittest {} unittest {} results: steves@steve-laptop:~/testd/unittestbug$ ~/dmd-2.051/linux/bin/dmd -lib -oflib1.a lib1.d steves@steve-laptop:~/testd/unittestbug$ ~/dmd-2.051/linux/bin/dmd -lib -oflib2.a lib2.d steves@steve-laptop:~/testd/unittestbug$ ~/dmd-2.051/linux/bin/dmd -lib -oflib3.a lib3.d steves@steve-laptop:~/testd/unittestbug$ ls -l *.a -rw-r--r-- 1 steves steves 3070 2011-02-10 17:07 lib1.a -rw-r--r-- 1 steves steves 3914 2011-02-10 17:07 lib2.a -rw-r--r-- 1 steves steves 4758 2011-02-10 17:07 lib3.a If I compile these files with the -c option: steves@steve-laptop:~/testd/unittestbug$ ~/dmd-2.051/linux/bin/dmd -c *.d steves@steve-laptop:~/testd/unittestbug$ ls -l *.o -rw-r--r-- 1 steves steves 1184 2011-02-10 17:08 lib1.o -rw-r--r-- 1 steves steves 1184 2011-02-10 17:08 lib2.o -rw-r--r-- 1 steves steves 1184 2011-02-10 17:08 lib3.o So clearly it has something to do with the -lib option, but I'm not sure what.

The size of libphobos.a has nothing to do with the size of an executable linked with Phobos. Multiobj will increase the size of the library simply because there's a lot of bookkeeping overhead for each .o file - overhead that does not go into the executable.

You are right, in the final executable, the size is the same. I'm not sure why the discrepancy in the object file, but clearly it's not affecting the exe.