[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
------------------------+-------------------------
  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
------------------------+-------------------------

Comment (by msieczka):

 Replying to [comment:7 glynn]:
 > Replying to [ticket:2916 msieczka]:
 > > Arch Linux build system by default sets
 CPPFLAGS="-D_FORTIFY_SOURCE=2".
 > >
 > > If I unset FORTIFY_SOURCE, configure and make passes. But when it's
 set, configure in GRASS 6 and 7 fails.
 >
 > {{{
 > configure:2722: checking how to run the C preprocessor
 > configure:2741: gcc -E -D_FORTIFY_SOURCE=2 conftest.c >/dev/null
 2>conftest.out
 > In file included from /usr/include/assert.h:35:0,
 >                  from configure:2736:
 > /usr/include/features.h:328:4: warning: #warning _FORTIFY_SOURCE
 requires compiling with optimization (-O) [-Wcpp]
 >  #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
 >     ^
 > configure: failed program was:
 > }}}
 >
 > This all arises because autoconf tends to treat ANYTHING written to
 stderr as indicating a failure.

 Thanks for the explanation. Do you know why this "_FORTIFY_SOURCE requires
 compiling with optimization (-O)" warning is triggered? I think it
 shouldn't be, because I do have optimization enabled in my build
 environment:

 {{{
 $ grep '\-O' /etc/makepkg.conf
 CFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong"
 CXXFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong"
 LDFLAGS="-Wl,-O1,--sort-common,--as-needed,-z,relro"
 }}}

 config.log-fail contents also reflect this.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2916#comment:10>
GRASS GIS <https://grass.osgeo.org>