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Compilers and Libraries forum Ramfunction with armclang and LTO and -Oz

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Ramfunction with armclang and LTO and -Oz

Roman Khazanskii over 4 years ago

I'm migrating from arm compiler 5 to armclang and I'm struggling with placing functions in RAM.

I tried using what this page suggests - https://www.keil.com/support/docs/3228.htm - and it works, if LTO is disabled.

If I enable LTO and set optimization level to -Oz, function gets inlined in 'normal' flash-function. Using -fno-inline or __attribute__((noinline)) doesn't affect this.

How can I prevent this?

Top replies

Roman Khazanskii over 4 years ago in reply to Ronan Synnott +2

Oh dear, I'm so sorry. Somehow I got all mixed up; the function wasn't inlined in the first place, even with LTO enabled everywhere.
Ronan Synnott over 4 years ago +1 verified

Hi Roman, this is the nature of LTO (link time optimization) - you are asking the linker to put this function in the most optimal place based on how other objects interact with it. LTO will result in a...