AN3350 datasheet(80/185 Pages) STMICROELECTRONICS

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Working with the ELF linker

AN3350

80/185

Doc ID 018512 Rev 2

For more information, read Section 11.4.2: ALIGN.

11.3.2

Arithmetic operations

You can use standard C arithmetic and logical operations when you define and use symbols

in linker command files. Table 10 shows the order of precedence for each operator. All

operators are left-associative. To learn more about C operators, refer to the C Compiler.

11.3.3

Comments

You can add comments to your file by using the C++ style double slash characters (//), C-

style slash and asterisks (/*, */). The linker ignores comments. For example, the

comments shown in Example 15 are valid comments.

Example 15 Example comments

/* This is a

multiline comment */

* (.text) // This is a partial-line comment

You can also place comments in a special section,.comment.

.comment_section :

{

*(.comment)

} > .comment

11.3.4

Dead strip prevention

Linkers remove unused code and data from the output file in a process known as dead

stripping. To prevent the linker from stripping unreferenced code and data, use the

FORCE_ACTIVE

, KEEP_SECTION, and REF_INCLUDE directives. Details about these

directives can be found in Section 11.4.3: FORCE_ACTIVE, Section 11.4.4:

KEEP_SECTION, Section 11.4.7: REF_INCLUDE and Section 11.4.5: FORCE_FILE.

Table 10.

Arithmetic operators

Precedence

Operators

1 (highest)

- ˜ !

* / %

3+ -

>> <<

== != > < <= >=

9 (lowest)

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