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build: make prefix mapping of debug information optional

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Remapping the local build path in debug information makes debugging
using ./scripts/remote-gdb harder, because files no longer refer to the full
path on the build host.

For local builds, debug information does not need to be reproducible,
since it will be stripped out of packages anyway.

For buildbot builds, it makes sense to keep debug information reproducible,
since the full path is not needed (nor desired) anywhere.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-06-22 21:44:37 +02:00 committed by CN_SZTL
parent 3a8faed93d
commit f37d0b447f
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GPG Key ID: 6850B6345C862176
2 changed files with 10 additions and 1 deletions
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9
config/Config-build.in
View File

@ -85,6 +85,15 @@ menu "Global build settings"
help
If enabled, config.seed will be stored in /etc/build.config of firmware.
config REPRODUCIBLE_DEBUG_INFO
bool "Make debug information reproducible"
default BUILDBOT
help
This strips the local build path out of debug information. This has the
advantage of making it reproducible, but the disadvantage of making local
debugging using ./scripts/remote-gdb harder, since the debug data will
no longer point to the full path on the build host.
config COLLECT_KERNEL_DEBUG
bool
prompt "Collect kernel debug information"

2
rules.mk
View File

@ -144,7 +144,7 @@ ifeq ($(or $(CONFIG_EXTERNAL_TOOLCHAIN),$(CONFIG_TARGET_uml)),)
ifeq ($(CONFIG_GCC_USE_IREMAP),y)
iremap = -iremap$(1):$(2)
else
iremap = -ffile-prefix-map=$(1)=$(2)
iremap = -f$(if $(CONFIG_REPRODUCIBLE_DEBUG_INFO),file,macro)-prefix-map=$(1)=$(2)
endif
endif