http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54854
Bug #: 54854
Summary: [avr] Deprecate and finally remove the -mshort-calls
command line option
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: g...@gcc.gnu.org
ReportedBy: g...@gcc.gnu.org
Target: avr
-mshort-calls uses RJMP/RCALL regardless of the flash size of the target
device. This will lead to a linker error if a JMP/CALL target is out of reach
of RJMP/RCALL:
file.c:(.text+0x1234): relocation truncated to fit: R_AVR_13_PCREL against
symbol `function' defined in in module.o
The -mshort-calls option dates back to the times before the linker could relax
JMP/CALL to RJMP/RCALL if the jump offset allows this.
The above error message is a blocker and hard to understand for users.
Instead of -mstort-calls, the compiler can be called with -mrelax or
-Wl,--relax to direct the linker to use the shortest possible instruction.
