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Warning about __STDC_FORMAT_MACROS #91

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chishiro opened this issue Sep 24, 2016 · 0 comments · May be fixed by #127
Open

Warning about __STDC_FORMAT_MACROS #91

chishiro opened this issue Sep 24, 2016 · 0 comments · May be fixed by #127

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@chishiro
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Hi!

I use picojson in my software.
Thank you for developing picojson!
Before including picojson.h, my software defines __STDC_FORMAT_MACROS and includes inttypes.h.
In this case, there is a warning about __STDC_FORMAT_MACROS.

picojson.h:71:10 warning: '__STDC_FORMAT_MACROS' macro redefined [-Wmacro-redefined]

To solve this problem, include guard is required as follows.

ifndef __STDC_FORMAT_MACROS

define __STDC_FORMAT_MACROS

endif

Please consider this revision.
NikolausDemmel added a commit to NikolausDemmel/picojson that referenced this issue May 13, 2020
@NikolausDemmel
fix compiler warning on __STDC_FORMAT_MACROS redef
43fd9d8 
Fixes kazuho#91 

Without this, if I include 2 libraries that define this macro, I get warnings like

```
warning: '__STDC_FORMAT_MACROS' macro redefined [-Wmacro-redefined]
```

This is on macos 10.15 with AppleClang 11.
@NikolausDemmel NikolausDemmel linked a pull request May 13, 2020 that will close this issue
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fix compiler warning on __STDC_FORMAT_MACROS redef NikolausDemmel/picojson
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@chishiro