Hello,
I'm compiling for arm with and without optimization and get different
sections for the initialized static variable myvar.
Unexpected section (wrong):
clang -std=c99 --target=thumbv7em-unknown-none-eabihf -g3 -O1 -gdwarf-2
-gstrict-dwarf -fdebug-macro -c main.c
llvm-objdump.exe .\main.o -t
- shows that the static initialized variable myvar is in section
.bss instead of section .data.myvar as expected:
- 00000004 l O .bss 00000001 myvar
Correct (expected) section without optimization (level 0):
clang -std=c99 --target=thumbv7em-unknown-none-eabihf -g3 -O0 -gdwarf-2
-gstrict-dwarf -fdebug-macro -c main.c
llvm-objdump.exe .\main.o -t
- shows that the static initialized variable myvar is in section
.data.myvar instead of section .data as expected:
- 00000000 l O .data_myvar 00000004 myvar
My example code:
Main.c
typedef enum
{
myinit = 0x1,
myidle = 0x2,
mybusy = 0x3
} myenumvar;
int startcond; // -> .bss
# pragma clang section data=".data_myvar"
static myenumvar myvar = myinit;
# pragma clang section data=""
int main(void)
{
startcond = 1;
if(1 == startcond)
{
if(myinit == myvar)
{
myvar = mybusy;
}
startcond = 0;
}
while(1);
return 0;
}
I wonder if this is a bug or am I missing some other option flags?
Best regards,
Helmut
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