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Pragmas for code generation

AN3350

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Doc ID 018512 Rev 2

Syntax

#pragma min_enum_size 1 | 2 | 4

Remarks

Turning on the enumsalwaysint pragma overrides this pragma. The default is 1.

21.11

pool_strings

Controls how string literals are stored.

Syntax

#pragma pool_strings on | off | reset

Remarks

If you enable this pragma, the compiler collects all string constants into a single data object

so your program needs one data section for all of them. If you disable this pragma, the

compiler creates a unique data object for each string constant. While this decreases the

number of data sections in your program, on some processors it also makes your program

bigger because it uses a less efficient method to store the address of the string.

This pragma is especially useful if your program is large and has many string constants.

Note:

If you enable this pragma, the compiler ignores the setting of the pcrelstrings pragma.

21.12

readonly_strings

Controls whether string objects are placed in a read-write or a read-only data section.

Syntax

#pragma readonly_strings on | off | reset

Remarks

If you enable this pragma, literal strings used in your source code are output to the read-only

data section instead of the global data section. In effect, these strings act like const char

, even though their type is really char *.

This pragma does not correspond to any IDE panel setting.

21.13

reverse_bitfields

Controls whether or not the compiler reverses the bitfield allocation.

Syntax

#pragma reverse_bitfields on | off | reset

AN3350 데이터시트(PDF) 168 Page - STMicroelectronics