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Error in accel/tcg?

From: Kenneth Adam Miller
Subject: Error in accel/tcg?
Date: Mon, 19 Jul 2021 18:18:53 -0400


I get the following error:

<long cmd here> -c ../accel/tcg/cputlb.c
../qemu/accel/tcg/cputlb.c: In function 'tlb_flush_page_by_mmuidx':
../qemu/accel/tcg/cputlb.c:602:23: error: comparison is always true due to limited range of data type [-Werror=type-limits]
    } else if (idxmap < TARGET_PAGE_SIZE) {

I don't know why that suddenly shows up. The variable idxmap is a uint16_t and I haven't changed that at all. Also, the TARGET_PAGE_SIZE is indicated set by cscope/global tags in a specific header, and there's no reason to believe that the value it takes happens to be larger than a uint16_t, so I suppose that the static tags are lacking where the compiler evaluation would indicate correctly. 

In other parts of the code, I think somehow the meson build system is triggering errors for warnings, so things like uninitialized variables that have their address passed so that a called function can edit them are making. But I didn't specifically turn on any of these warnings to error settings. So my other thought is, perhaps because a version of gcc has some implicit initialization for variables declared without initialization. I checked that and resolved those. But I've been stumped for a while on the idxmap problem.

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