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Erroneous warning: will never be executed regression from 3.4
- From: Bill Priest <priestwilliaml at yahoo dot com>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 2 Jul 2002 12:08:21 -0700 (PDT)
- Subject: Erroneous warning: will never be executed regression from 3.4
All,
With gcc 3.1 on linux x86 I get the subject
with the following command line:
gcc -Wunreachable-code -c -o t.o t.c
t.c
-------------------------------------------
typedef struct
{
unsigned one_B;
unsigned two_B;
unsigned three_B;
unsigned four_B;
unsigned five_B;
unsigned six_B;
unsigned seven_B;
unsigned eight_B;
unsigned nine_B;
unsigned ten_B;
unsigned eleven_B;
unsigned twelve_B;
unsigned thirteen_B;
unsigned fourteen_B;
unsigned fifteen_B;
unsigned sixteen_B;
unsigned seventeen_B;
unsigned eighteen_B ;
unsigned nineteen_B;
unsigned twenty_B;
unsigned twenty_one_B ;
unsigned twenty_two_B;
unsigned twenty_three_B;
}A_TYPE;
extern A_TYPE a;
void t(void)
{
if ((a.one_B == 0) || (a.eleven_B != 0))
{
#ifdef WARNING_GOES_AWAY
a.twenty_two_B = 1;
#endif
return;
}
a.twenty_one_B = 1;
}
--------------------------------------------------
gcc -Wunreachable-code -c -o t.o t.c
t.c: In function `t':
t.c:36: warning: will never be executed
gcc -Wunreachable-code -c -o t.o t.c
-DWARNING_GOES_AWAY
gcc 3.4 doesn't have this warning
FYI,
Bill
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