cat <<EOF > t.c
int foo(){}
#pragma pack(1)
EOF
gcc -S -fprofile-generate t.c
grep '^\.LPBX' -A 2 t.s
.LPBX0:
.long 875574314
.quad 0
The padding ('.zero 4') between .long and .quad that correspond to the first
two fields of struct gcov_info (an int and a ptr) is gone. This makes building
Firefox with profile feedback impossible on amd64. At least gcc-4.[1345]
behave this way.
--
Summary: pragma pack changes padding in struct gcov_info on 64-
bit archs
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: amonakov at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43341
