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Date: Fri, 11 Jan 2008 02:28:00 -0000
Subject: [Bug c++/34734]  New: attribute((progmem)) not handled properly in C++ for AVRs
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Using the progmem attribute in C++ sources produce warning messages about
uninitialized variables. The following preprocessor output works correctly
under 4.1 but produces said warnings (in every warning level):

# 1 "is.cpp"
# 1 "<built-in>"
# 1 "<command-line>"
# 1 "is.cpp"
int i1 __attribute__((__progmem__)) = 1;
int __attribute__((__progmem__)) i2 = 2;
__attribute__((__progmem__)) int i3 = 3;
extern int i4 __attribute__((__progmem__)); int i4 = 4;
extern int __attribute__((__progmem__)) i5; int i5 = 5;
extern __attribute__((__progmem__)) int i6; int i6 = 6;
typedef int i7_t __attribute__((__progmem__)); i7_t i7 = 7;
typedef int __attribute__((__progmem__)) i8_t; i8_t i8 = 8;
typedef __attribute__((__progmem__)) int i9_t; i9_t i9 = 9;
const char s1[] __attribute__((__progmem__)) = "string 1";
const char __attribute__((__progmem__)) s2[] = "string 2";
const __attribute__((__progmem__)) char s3[] = "string 3";
__attribute__((__progmem__)) const char s4[] = "string 4";
extern const char s5[] __attribute__((__progmem__)); const char s5[] = "string
5";
extern const char __attribute__((__progmem__)) s6[]; const char s6[] = "string
6";
extern const __attribute__((__progmem__)) char s7[]; const char s7[] = "string
7";
extern __attribute__((__progmem__)) const char s8[]; const char s8[] = "string
8";
typedef const char s9_t __attribute__((__progmem__)); const s9_t s9[] = "string
9";
typedef const char __attribute__((__progmem__)) s10_t; const s10_t s10[] =
"string 10";
typedef const __attribute__((__progmem__)) char s11_t; const s11_t s11[] =
"string 11";
typedef __attribute__((__progmem__)) const char s12_t; const s12_t s12[] =
"string 12";

This is the used command line and the compiler output:

/usr/local/avr-4.2.2/bin/avr-gcc -Wall -save-temps -mmcu=atmega88 -Os -c -o
/tmp/x.o is.cpp
is.cpp:1: warning: only initialized variables can be placed into program memory
area
is.cpp:2: warning: only initialized variables can be placed into program memory
area
is.cpp:3: warning: only initialized variables can be placed into program memory
area
is.cpp:10: warning: only initialized variables can be placed into program
memory area
is.cpp:11: warning: only initialized variables can be placed into program
memory area
is.cpp:12: warning: only initialized variables can be placed into program
memory area
is.cpp:13: warning: only initialized variables can be placed into program
memory area

Please note that the same source compiled as C works properly without any
warnings.


-- 
           Summary: attribute((progmem)) not handled properly in C++ for
                    AVRs
           Product: gcc
           Version: 4.2.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: markuslampert at yahoo dot com
  GCC host triplet: x86
GCC target triplet: avr


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34734