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When a program that depends on implot includes <implot.h>, we have this sequence of includes: <implot.h> -> <implot_internal.h> -> <imgui_internal.h> -> <math.h> Inside <implot_internal.h>'s source code, there's an unqualified call to isnan(). By doing so, it relies on <imgui_internal.h> having isnan() in the global namespace, which <math.h> is guaranteed to do. However, it's possible that implot's user included <cmath> first, which is not guaranteed to put isnan() in the global namespace, and may prevent a later <math.h> from putting isnan() in the global namespace. On NetBSD 10.0 i386, <cmath> doesn't put isnan() in the global namespace and prevents <math.h> from doing so, causing a compile error. Qualify the call to fix it.
guijan
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The NetBSD port will only work after epezent/implot#565 is merged and Dolphin updates to a version with the fix. In the meantime, you can apply the fix yourself to a Dolphin checkout.
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The NetBSD port will only work after epezent/implot#565 is merged and Dolphin updates to a version with the fix. In the meantime, you can apply the fix yourself to a Dolphin checkout.
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@guijan is this still an issue with the latest ImGui? I thought |
brenocq
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I can confirm that this still happens with master. I just came across this issue while trying to cross-compile from x64 to ARM64 on Linux while using glibc in particular. |
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Oh... I've moved the issue to high priority :) Are you able to reproduce the issue by modifying the |
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I've narrowed it down quite a lot, so much so that I can place the reproduction program here: #include <cmath>
#include "implot.h"
#include "implot_internal.h"
int main() { return 0; }Here is what happens when I try to compile this program using glibc and gcc/g++ from x64 to ARM64: Log OutputIt seems including cmath before implot_internal.h causes the issue to show up. This issue does not happen when compiling without a sysroot and cross-compiler, though. |
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brenocq
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Dec 21, 2025
| static inline int ImPosMod(int l, int r) { return (l % r + r) % r; } | ||
| // Returns true if val is NAN | ||
| static inline bool ImNan(double val) { return isnan(val); } | ||
| static inline bool ImNan(double val) { return std::isnan(val); } |
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Looks like this problem is compiler-specific. Can you change it to the below? Then we can merge it.
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| static inline bool ImNan(double val) { return std::isnan(val); } | |
| static inline bool ImNan(double val) { return (val != val); } |
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return (val != val);? Doesn't this always evaluates to false?
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Yep, that looks pretty narrow to me... |
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See the commit message for details. I've tested this change on NetBSD only.
Found while porting dolphin-emu/dolphin to NetBSD: