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  VS Arduino › Visual Micro › Installation & Troubleshooting › ONE global var declaration, but multiple instantiations ?
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Normal Topic ONE global var declaration, but multiple instantiations ? (Read 1074 times)
GoofBall
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ONE global var declaration, but multiple instantiations ?
Jan 22nd, 2021 at 10:17pm
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I have a.h  and a.cpp,  as well as b.h and b.cpp.  This is in addition to myproject.ino, and all in the same folder.

a.h has global var declaration: static char schedfile[1000]; 

b.cpp has:  #include "a.h"

But upon compilation:  TWO instantiations are shown in the .map file:
.bss._ZL9schedfile
                0x3fff1224      0x3e8 project_main.cpp.o
.bss._ZL9schedfile
                0x3fff160c      0x3e8 schedule_file.cpp.o

I'm baffled.  Anyone have any ideas?
  
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Simon@Visual Micro
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Re: ONE global var declaration, but multiple instantiations ?
Reply #1 - Jan 23rd, 2021 at 12:40pm
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Do you get the same issue compiling in Arduino IDE?

Does the variable need to be marked "extern" so it is the only one referenced by all instances?

  
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Tim@Visual Micro
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Re: ONE global var declaration, but multiple instantiations ?
Reply #2 - Feb 4th, 2021 at 6:23pm
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Also to ensure you use our or an arduino example to create a header file. Those examples add a condition to the top of the header that ensures the header is compiled only once. Without that your report would be normal behavour.
  
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