https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100357
Sebastian Huber <sebastian.hu...@embedded-brains.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|attribute noinit with |unexpected behaviour of
|-fdata-sections unexpected |attribute noinit
|behaviour |
--- Comment #1 from Sebastian Huber <sebastian.hu...@embedded-brains.de> ---
Consider the following test code:
__attribute__(( __noinit__ )) int a;
__attribute__(( __noinit__ )) int b;
On a target with a small data area (e.g. powerpc) this yields:
powerpc-rtems6-gcc -O2 -S -o - test.c
.file "test.c"
.machine ppc
.section ".text"
.globl B
.globl a
.section .sbss,"aw",@nobits
.align 2
.type B, @object
.size B, 4
B:
.zero 4
.type a, @object
.size a, 4
a:
.zero 4
.ident "GCC: (GNU) 10.2.1 20210113 (RTEMS 6, RSB
3d30ecae960152dd5a0e1be55de97dd46486ac53, Newlib 415fdd4)"
.section .note.GNU-stack,"",@progbits
On arm you get the expected result:
arm-rtems6-gcc -O2 -S -o - test.c
.cpu arm7tdmi
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 2
.eabi_attribute 34, 0
.eabi_attribute 18, 4
.file "test.c"
.text
.global B
.global a
.section .noinit,"aw"
.align 2
.type B, %object
.size B, 4
B:
.space 4
.type a, %object
.size a, 4
a:
.space 4
.ident "GCC: (GNU) 10.2.1 20210113 (RTEMS 6, RSB
3d30ecae960152dd5a0e1be55de97dd46486ac53, Newlib 415fdd4)"
However, with -fdata-sections you get:
arm-rtems6-gcc -O2 -S -o - test.c -fdata-sections
.cpu arm7tdmi
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 2
.eabi_attribute 34, 0
.eabi_attribute 18, 4
.file "test.c"
.text
.global B
.global a
.section .bss.B,"aw",%nobits
.align 2
.type B, %object
.size B, 4
B:
.space 4
.section .bss.a,"aw",%nobits
.align 2
.type a, %object
.size a, 4
a:
.space 4
.ident "GCC: (GNU) 10.2.1 20210113 (RTEMS 6, RSB
3d30ecae960152dd5a0e1be55de97dd46486ac53, Newlib 415fdd4)"
