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shundhammer/libyui-compiler-options.md

Last active December 9, 2020 09:29
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Libyui Compiler Options
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libyui-compiler-options.md

Building libyui with the new CMake Build Environment

Compiler options can now easily be changed in the toplevel CMakeLists.txt:

add_compile_options( "-Wall" )
add_compile_options( "-O3 -g" )

No Compiler Options (GCC Defaults):

% size libyui.so.14.0.0
   text	   data	    bss	    dec	    hex	filename
1792378	  55352	   3216	1850946	 1c3e42	libyui.so.14.0.0

% ls -lh libyui.so.14.0.0
-rwxr-xr-x 1 sh users 2.4M Dez  9 10:07 libyui.so.14.0.0

stripped: 1.8 MB

With -O3:

% size libyui.so.14.0.0 
   text	   data	    bss	    dec	    hex	filename
 970813	  29352	   3064	1003229	  f4edd	libyui.so.14.0.0

% ls -lh libyui.so.14.0.0 
-rwxr-xr-x 1 sh users 1.2M Dez  9 10:13 libyui.so.14.0.0

stripped: 985 KB

With -O3 -g:

 % ls -lh libyui.so.14.0.0
-rwxr-xr-x 1 sh users 20M Dez  9 10:16 libyui.so.14.0.0

% size libyui.so.14.0.0
   text	   data	    bss	    dec	    hex	filename
 970813	  29352	   3064	1003229	  f4edd	libyui.so.14.0.0

stripped: 985 KB

With -Os (Optimize for Size):

% ls -lh libyui.so.14.0.0
-rwxr-xr-x 1 sh users 934K Dez  9 10:21 libyui.so.14.0.0

% size libyui.so.14.0.0
   text	   data	    bss	    dec	    hex	filename
 699525	  30728	   3064	 733317	  b3085	libyui.so.14.0.0

stripped: 722 KB

Reference

https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html

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