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Compiler Command-line Options
Restrictions
The compiler defines and undefines macros in the following order:
1. compiler predefined macros
2. macros defined explicitly, using -Dname
3. macros explicitly undefined, using -Uname.
Example
Specifying the option:
-DMAX(X,Y)="((X > Y) X : Y)"
on the command line is equivalent to defining the macro:
#define MAX(X, Y) ((X > Y) X : Y)
at the head of each source file.
See also
• -C on page 2-22
• -E on page 2-52
• -Uname on page 2-127
• Compiler predefines on page 4-198.
2.1.36 --data_reorder, --no_data_reorder
This option enables or disables automatic reordering of top-level data items, for
example global variables.
The compiler can save memory by eliminating wasted space between data items.
However, --data_reorder can break legacy code, if the code makes invalid assumptions
about ordering of data by the compiler.
The ISO C Standard does not guarantee data order, so you must avoid writing code that
depends on any assumed ordering. If you require data ordering, place the data items into
a structure.
Default
The default is --data_reorder.
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