With a source as simple as the following:
-----8<--------
int foo(int a, int b) {
return a + b;
}
-----8<--------
a .eh_frame section is created on x86-64 when using -fno-exceptions. The
section is *not* created on x86.
on x86-64:
$ g++ -o test.o -c test.cpp -fno-exceptions
$ objdump -h test.o
test.o: file format elf64-x86-64
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000015 0000000000000000 0000000000000000 00000040 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 0000000000000000 0000000000000000 00000058 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 0000000000000000 0000000000000000 00000058 2**2
ALLOC
3 .comment 0000001d 0000000000000000 0000000000000000 00000058 2**0
CONTENTS, READONLY
4 .note.GNU-stack 00000000 0000000000000000 0000000000000000 00000075
2**0
CONTENTS, READONLY
5 .eh_frame 00000038 0000000000000000 0000000000000000 00000078 2**3
CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
on x86:
$ g++ -o test.o -c test.cpp -fno-exceptions
$ objdump -h test.o
test.o: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 0000000e 00000000 00000000 00000034 2**2
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000000 00000000 00000000 00000044 2**2
CONTENTS, ALLOC, LOAD, DATA
2 .bss 00000000 00000000 00000000 00000044 2**2
ALLOC
3 .comment 0000001d 00000000 00000000 00000044 2**0
CONTENTS, READONLY
4 .note.GNU-stack 00000000 00000000 00000000 00000061 2**0
CONTENTS, READONLY
The section is created on x86 when not using -fno-exceptions, which is not a
surprise.
--
Summary: .eh_frame section created despite -fno-exceptions
Product: gcc
Version: 4.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mh+gcc at glandium dot org
GCC build triplet: x86_64-linux-gnu
GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43232
