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kbuild: -ffunction-sections fix for archs with conflicting sections

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Enabling -ffunction-sections modified the generic linker script to
pull .text.* sections into regular TEXT_TEXT section, conflicting
with some architectures. Revert that change and require archs that
enable the option to ensure they have no conflicting section names,
and do the appropriate merging.

Reported-by: Guenter Roeck <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Fixes: b67067f117 ("kbuild: allow archs to select link dead code/data elimination")
Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Nicholas Piggin 2016-09-14 12:24:03 +10:00 • committed by Michal Marek
commit 0f4c4af06e
2 changed files with 13 additions and 6 deletions
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4
arch/Kconfig
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@ -478,7 +478,9 @@ config LD_DEAD_CODE_DATA_ELIMINATION
This requires that the arch annotates or otherwise protects
its external entry points from being discarded. Linker scripts
must also merge .text.*, .data.*, and .bss.* correctly into
output sections.
output sections. Care must be taken not to pull in unrelated
sections (e.g., '.text.init'). Typically '.' in section names
is used to distinguish them from label names / C identifiers.
config HAVE_CONTEXT_TRACKING
bool