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Fix linking MSP430 files created by gcc's LTO optimizer. 

When invoking GCC with "-g -flto", the compiler will create LTO objects
with debug information. The objects created are "simple ELF" objects (see
libiberty/simple-object-elf.c) and do not have target-specific sections.

When the MSP430 linker sees one of these objects without a .MSP430.attributes
section it errors:

> error: /tmp/cc4LhbEI.ltrans0.ltrans.o uses MSP430X instructions but /tmp/ccynqIwudebugobj uses unknown
> error: /tmp/cc4LhbEI.ltrans0.ltrans.o uses the small code model whereas /tmp/ccynqIwudebugobj uses the unknown code model
> error: /tmp/cc4LhbEI.ltrans0.ltrans.o uses the small data model whereas /tmp/ccynqIwudebugobj uses the unknown data model
> error: /tmp/cc4LhbEI.ltrans0.ltrans.o uses the small code model but /tmp/ccynqIwudebugobj uses the unknown data model
> failed to merge target specific data of file /tmp/cc4LhbEI.ltrans0.ltrans.o

The following patch allows these debug LTO objects to be linked with other
MSP430 objects even if they do not have a .MSP430.attributes section.

bfd	* elf32-msp430.c (elf32_msp430_merge_mspabi_attributes): Do not
	error when .MSP430.attributes section is missing from objects
	created by LTO.
This commit is contained in:
Jozef Lawrynowicz 2018-11-21 16:21:25 +00:00 committed by Nick Clifton
parent b5ffee3181
commit ca94519e70
2 changed files with 12 additions and 0 deletions
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6
bfd/ChangeLog
View File

@ -1,3 +1,9 @@
2018-11-21 Jozef Lawrynowicz <jozef.l@mittosystems.com>
* elf32-msp430.c (elf32_msp430_merge_mspabi_attributes): Do not
error when .MSP430.attributes section is missing from objects
created by LTO.
2018-11-13 Jim Wilson <jimw@sifive.com>
* elfnn-riscv.c (riscv_float_abi_string): New.

6
bfd/elf32-msp430.c
View File

@ -2424,6 +2424,12 @@ elf32_msp430_merge_mspabi_attributes (bfd *ibfd, struct bfd_link_info *info)
if (ibfd->flags & BFD_LINKER_CREATED)
return TRUE;
/* LTO can create temporary files for linking which may not have an attribute
section. */
if (ibfd->lto_output
&& bfd_get_section_by_name (ibfd, ".MSP430.attributes") == NULL)
return TRUE;
/* If this is the first real object just copy the attributes. */
if (!elf_known_obj_attributes_proc (obfd)[0].i)
{