Hello, This change is a proposal to introduce a target overridable macro to replace the hardcoded value used in common.opt to initialize dwarf_version.
The main advantage compared to special code in a target
override_options hook is that redefinitions by target config files
are visible by both the compiler proper and by the driver, which
might refer to dwarf_version in ASM_DEBUG_SPECs and friends.
This is useful at least on VxWorks, where we usually need to
default to dwarf 4 or even 2 to accommodate non-gdb debuggers
provided by the environment, including for assembly sources
used in libgcc for some ports (witnessed with lse.S on aarch64).
We have been using this in a lot of gcc-11 based toolchains
for various configurations for a while, cross and native.
This is a noop for anything but VxWorks and helped cure crashes
of target debuggers in VxWorks environments.
Bootstrapped and regression tested for mainline on x86_64-linux.
Is this ok to commit?
Thanks in advance!
Best Regards,
Olivier
2022-09-30 Olivier Hainque <hain...@adacore.com>
gcc/
* defaults.h (DWARF_DEFAULT_VERSION): Define if not
defined already.
* common.opt (gdwarf-): Use it.
* doc/tm.texi.in (DWARF_DEFAULT_VERSION): Document.
* doc/tm.texi: Update accordingly.
* config/vxworks.h (DWARF_DEFAULT_VERSION): Redefine.
* config/vxworks.cc: Remove code setting dwarf_version, now
handled by the DWARF_DEFAULT_VERSION redefinition.
0012-Introduce-DWARF_VERSION_DEFAULT-and-redefine-for-VxW.patch
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