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cmake: LD: Allow input sections to remain unsorted

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We have users that have problems in their linker scripts where the
order of input sections matters.

To allow users to use the latest Zephyr while working on a fix to
their linker scripts we add an option to allow leaving the sections
unsorted.

See discussion here for more details
https://github.com/zephyrproject-rtos/zephyr/pull/14183

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This commit is contained in:
Sebastian Bøe 2019-03-15 14:05:09 +01:00 committed by Carles Cufí
parent 5895f8d8f1
commit 3a0597f099
2 changed files with 10 additions and 1 deletions
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3
CMakeLists.txt
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@ -396,7 +396,8 @@ zephyr_ld_options(
# Sort the common symbols and each input section by alignment # Sort the common symbols and each input section by alignment
# in descending order to minimize padding between these symbols. # in descending order to minimize padding between these symbols.
zephyr_ld_options( zephyr_ld_option_ifdef(
CONFIG_LINKER_SORT_BY_ALIGNMENT
${LINKERFLAGPREFIX},--sort-common=descending ${LINKERFLAGPREFIX},--sort-common=descending
${LINKERFLAGPREFIX},--sort-section=alignment ${LINKERFLAGPREFIX},--sort-section=alignment
) )

8
Kconfig.zephyr
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@ -186,6 +186,14 @@ config CHECK_LINK_MAP
Run a linker address generation validity checker at the end of the Run a linker address generation validity checker at the end of the
build. build.
config LINKER_SORT_BY_ALIGNMENT
bool "Sort input sections by alignment"
default y
help
This turns on the linker flag to sort sections by alignment
in decreasing size of symbols. This helps to minimize
padding between symbols.
endmenu endmenu
menu "Compiler Options" menu "Compiler Options"