[GRASS-dev] [GRASS GIS] #2916: configure bug (?): FORTIFY_SOURCE in CPPFLAGS breaks configure on Arch Linux

[GRASS GIS]

#2916: configure bug (?): FORTIFY_SOURCE in CPPFLAGS breaks configure on Arch
Linux
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  Reporter:  msieczka   |      Owner:  grass-dev@…
      Type:  defect     |     Status:  new
  Priority:  normal     |  Milestone:  7.0.4
 Component:  Compiling  |    Version:  7.0.3
Resolution:             |   Keywords:
       CPU:  All        |   Platform:  Linux
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Comment (by glynn):

 Replying to [comment:17 scimmia]:
 > No, being a "D" flag, CPPFLAGS is correct,

 That would be true ... if it wasn't for the fact that <features.h> has an
 interaction between the setting of _FORTIFY_SOURCE and the setting of
 __OPTIMIZE__. The latter is set by the compiler based upon -O switches,
 which definitely shouldn't go into CPPFLAGS.

 _FORTIFY_SOURCE shouldn't be set to a value other than zero unless
 optimisation is enabled, and CPPFLAGS shouldn't contain any optimisation
 switches. Therefore, CPPFLAGS shouldn't contain a setting for
 _FORTIFY_SOURCE.

 The fact that -D_FORTIFY_SOURCE=1 is interpreted by the preprocessor
 doesn't mean that it's acceptable to set that flag when running the
 preprocessor separately from compilation.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2916#comment:19>
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