Very stange compile error on Windows

[Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>]

Folks,

 

I just tried to build ADCore on Windows, which has worked fine in the past.  Today I got an error compiling ADApp/pluginSrc/NDPluginCircularBuff.cpp.

 

I managed to reduce the problem to a 2-line test program that fails to compile.  This is test.cpp.

 

#include <epicsMath.h>

#include <epicsTime.h>

 

This is the error output when test.cpp is compiled:

 

cl -EHsc -GR           -DBUILDING_NDPlugin_API     -nologo -FC -D__STDC__=0 -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE    -Ox -Oy-   -W3 -w44355 -w44344 -w44251 -D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING     -DHAVE_JPEG -DHAVE_BLOSC -DHAVE_BITSHUFFLE -DLIBXML_STATIC -DLIBTIFF_STATIC -DH5_BUILT_AS_STATIC_LIB    -MT  -TP   -I. -I../O.Common -I. -I. -I.. -I../../../include/compiler/msvc -I../../../include/os/WIN32 -I../../../include      -IJ:/epics/support/asyn-4-44-2/include     -IJ:/epics/support/areaDetector-3-13/ADSupport/include/os/WIN32 -IJ:/epics/support/areaDetector-3-13/ADSupport/include   -IJ:/epics/support/areaDetector-3-13/ADCore/include -IH:/epics/base-7.0.7/include/compiler/msvc -IH:/epics/base-7.0.7/include/os/WIN32 -IH:/epics/base-7.0.7/include        -c ../test.cpp

test.cpp

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2588: '::!_finite': illegal global finalizer

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2143: syntax error: missing ')' before '!'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2143: syntax error: missing ';' before '!'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2270: '_finite': modifiers not allowed on nonmember functions

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2588: '::!_isnan': illegal global finalizer

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C2059: syntax error: ')'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(signed char) noexcept': overloaded function differs only by return type from 'int _isnan(signed char) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2371: '_isnan': redefinition; different basic types

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(unsigned char) noexcept': overloaded function differs only by return type from 'int _isnan(unsigned char) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(short) noexcept': overloaded function differs only by return type from 'int _isnan(short) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(unsigned short) noexcept': overloaded function differs only by return type from 'int _isnan(unsigned short) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(int) noexcept': overloaded function differs only by return type from 'int _isnan(int) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): error C2556: 'bool _isnan(unsigned int) noexcept': overloaded function differs only by return type from 'int _isnan(unsigned int) noexcept'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(831): note: see declaration of '_isnan'

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\cmath(832): fatal error C1003: error count exceeds 100; stopping compilation

make[1]: *** [H:/epics/base-7.0.7/configure/RULES_BUILD:267: test.obj] Error 2

make[1]: Leaving directory 'J:/epics/support/areaDetector-3-13/ADCore/ADApp/pluginSrc/O.windows-x64-static'

make: *** [H:/epics/base-7.0.7/configure/RULES_ARCHS:58: install.windows-x64-static] Error 2

 

If I reverse the order of the 2 includes in test.cpp, i.e. include epicsTime.h before epicsMath.h then it builds fine.

 

cl -EHsc -GR           -DBUILDING_NDPlugin_API     -nologo -FC -D__STDC__=0 -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE    -Ox -Oy-   -W3 -w44355 -w44344 -w44251 -D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING     -DHAVE_JPEG -DHAVE_BLOSC -DHAVE_BITSHUFFLE -DLIBXML_STATIC -DLIBTIFF_STATIC -DH5_BUILT_AS_STATIC_LIB    -MT  -TP   -I. -I../O.Common -I. -I. -I.. -I../../../include/compiler/msvc -I../../../include/os/WIN32 -I../../../include      -IJ:/epics/support/asyn-4-44-2/include     -IJ:/epics/support/areaDetector-3-13/ADSupport/include/os/WIN32 -IJ:/epics/support/areaDetector-3-13/ADSupport/include   -IJ:/epics/support/areaDetector-3-13/ADCore/include -IH:/epics/base-7.0.7/include/compiler/msvc -IH:/epics/base-7.0.7/include/os/WIN32 -IH:/epics/base-7.0.7/include        -c ../test.cpp

test.cpp

(no error)

 

I was able to fix the problem with compiling NDPluginCircularBuff.cpp by including epicsTime.h before epicsMath.h.

 

There are 2 things that I don’t understand:

• Why is this failing to compile.
• Why did it previously work?  I have not knowingly updated Visual Studio or EPICS base (7.0.7), and NDPluginCircularBuffer.cpp was last changed in 2020.

 

Thanks,

Mark