RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
• Template instantiations and their local static variables.
• Elimination of unused variables and functions. However, using #pragma arm
section enables the linker to eliminate a function or variable that might otherwise
be kept because it is in the same section as a used function or variable.
• The order that definitions are written to the object file.
Example
int x1 = 5;
int y1[100];
int const z1[3] = {1,2,3};
// in .data (default)
// in .bss (default)
// in .constdata (default)
#pragma arm section rwdata = "foo", rodata = "bar"
int x2 = 5;
int y2[100];
int const z2[3] = {1,2,3};
char *s2 = "abc";
#pragma arm section rodata
int x3 = 5;
int y3[100];
int const z3[3] = {1,2,3};
char *s3 = "abc";
#pragma arm section code = "foo"
int add1(int x)
{
return x+1;
}
// in foo (data part of region)
// in .bss
// in bar
// s2 in foo, "abc" in .conststring
// in foo
// in .bss
// in .constdata
// s3 in foo, "abc" in .conststring
// in foo (code part of region)
#pragma arm section code
See also
• __attribute__((section)) on page 4-34
• Chapter 5 Using Scatter-loading Description Files in the Linker Guide.
4.6.4 #pragma diag_default tag[,tag,...]
This pragma returns the severity of the diagnostic messages that have the specified tags
to the severities that were in effect before any pragmas were issued.
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