gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
** Description changed:
This code shows the bug:
---
#include <stdio.h>
typedef __attribute__ ((__aligned__ (16))) struct _TEST_FLOAT128 {
- __extension__ unsigned long long Part[2];
+ __extension__ unsigned long long Part[2];
} TEST_FLOAT128;
int main( void )
{
- TEST_FLOAT128 tf;
- printf( "alignof(tf) = %d\n",(int)__alignof__(tf) );
+ TEST_FLOAT128 tf;
+ printf( "alignof(tf) = %d\n",(int)__alignof__(tf) );
- printf( "alignof(struct _TEST_FLOAT128) = %d\n",(int)__alignof__(struct
_TEST_FLOAT128) );
- printf( "alignof(TEST_FLOAT128) = %d\n",(int)__alignof__(TEST_FLOAT128) );
+ printf( "alignof(struct _TEST_FLOAT128) = %d\n",(int)__alignof__(struct
_TEST_FLOAT128) );
+ printf( "alignof(TEST_FLOAT128) = %d\n",(int)__alignof__(TEST_FLOAT128) );
- return 0;
+ return 0;
}
---
$ g++-4.9 -O3 -flto -oalign test.cc -Wall -Wextra -g
# compiles without warnings.
$ g++-5 -O3 -flto -oalign test.cc -Wall -Wextra -g
- 1.cc:3:51: warning: type ‘struct _TEST_FLOAT128’ violates one definition rule
[-Wodr]
- typedef __attribute__ ((__aligned__ (16))) struct _TEST_FLOAT128 {
- ^
- 1.cc:5:3: note: a type with different alignment is defined in another
translation unit
- } TEST_FLOAT128;
- ^
+ test.cc:3:51: warning: type ‘struct _TEST_FLOAT128’ violates one definition
rule [-Wodr]
+ typedef __attribute__ ((__aligned__ (16))) struct _TEST_FLOAT128 {
+ ^
+ test.cc:5:3: note: a type with different alignment is defined in another
translation unit
+ } TEST_FLOAT128;
+ ^
# triggers a warning.
** Description changed:
This code shows the bug:
- ---
+ ---test.cc---
#include <stdio.h>
typedef __attribute__ ((__aligned__ (16))) struct _TEST_FLOAT128 {
__extension__ unsigned long long Part[2];
} TEST_FLOAT128;
int main( void )
{
TEST_FLOAT128 tf;
printf( "alignof(tf) = %d\n",(int)__alignof__(tf) );
printf( "alignof(struct _TEST_FLOAT128) = %d\n",(int)__alignof__(struct
_TEST_FLOAT128) );
printf( "alignof(TEST_FLOAT128) = %d\n",(int)__alignof__(TEST_FLOAT128) );
return 0;
}
---
$ g++-4.9 -O3 -flto -oalign test.cc -Wall -Wextra -g
# compiles without warnings.
$ g++-5 -O3 -flto -oalign test.cc -Wall -Wextra -g
test.cc:3:51: warning: type ‘struct _TEST_FLOAT128’ violates one definition
rule [-Wodr]
typedef __attribute__ ((__aligned__ (16))) struct _TEST_FLOAT128 {
^
test.cc:5:3: note: a type with different alignment is defined in another
translation unit
} TEST_FLOAT128;
^
# triggers a warning.
--
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https://bugs.launchpad.net/bugs/1720959
Title:
Bug with LTO optimizations in G++?
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