Hello,
there seems to be still a problem with 'pragma Linker_Section':
package test is
eeprom : constant String := "12345678901234567"; -- 17 byte
pragma Linker_Section (Entity => eeprom,
Section => ".eeprom");
type Eeprom_String is new String;
pragma Linker_Section (Entity => Eeprom_String,
Section => ".eeprom");
Data_1 : constant Eeprom_String := "12345678901234567"; -- 17 byte
Data_2 : constant String := "1234567890123456"; -- 16 byte
pragma Linker_Section (Entity => Data_2,
Section => ".eeprom");
end;
$ gcc -c test.ads
$ readelf -a test.o
[..]
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00000000 000034 000000 00 AX 0 0 4
[ 2] .data PROGBITS 00000000 000034 000022 00 WA 0 0 4
[ 3] .bss NOBITS 00000000 000058 000000 00 WA 0 0 4
[ 4] .eeprom PROGBITS 00000000 000058 000011 00 WA 0 0 1
[..]
Symbol table '.symtab' contains 12 entries:
Num: Value Size Type Bind Vis Ndx Name
[..]
9: 00000000 17 OBJECT GLOBAL DEFAULT 4 test__eeprom
10: 00000001 17 OBJECT GLOBAL DEFAULT 2 test__data_1
11: 00000012 16 OBJECT GLOBAL DEFAULT 2 test__data_2
The problems I can see are:
1. The minimum usable length is 17 byte!
2. gcc ignors 'pragma Linker_Section' for types.
gcc version 4.0.0 20041123 (experimental)
--
Summary: pragma Linker_Section problems
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ada
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: berndtrog at yahoo dot com
CC: gcc-bugs at gcc dot gnu dot org
GCC host triplet: i686-gnu-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18680
