Avoid invalid memory optimizations (#20389)
When building for AVR, merge-all-constants can incorrectly combine constants stored in flash with constants stored in RAM. These have different access requirements, leading to undefined behavior during execution. Co-authored-by: ellensp <ellensp@hotmail.com>
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@ -203,7 +203,7 @@ extra_scripts =
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pre:buildroot/share/PlatformIO/scripts/common-dependencies.py
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pre:buildroot/share/PlatformIO/scripts/common-cxxflags.py
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post:buildroot/share/PlatformIO/scripts/common-dependencies-post.py
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build_flags = -fmax-errors=5 -g -D__MARLIN_FIRMWARE__ -fmerge-all-constants
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build_flags = -fmax-errors=5 -g -D__MARLIN_FIRMWARE__ -fmerge-constants
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lib_deps =
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#
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