#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
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Comment (by 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.
It then goes on to try:
{{{
configure:2758: gcc -E -traditional-cpp -D_FORTIFY_SOURCE=2 conftest.c
>/dev/null 2>conftest.out
In file included from /usr/include/assert.h:36:0,
from configure:2754:
/usr/include/features.h:328:4: warning: #warning _FORTIFY_SOURCE requires
compiling with optimization (-O) [-Wcpp]
# warning _FORTIFY_SOURCE requires compiling with optimization (-O)
}}}
which fails for the same reason.
Finally it tries:
{{{
configure:2775: gcc -nologo -E -D_FORTIFY_SOURCE=2 conftest.c >/dev/null
2>conftest.out
gcc: error: unrecognized command line option '-nologo'
}}}
After everything it has tried has failed (by its standards), it
unconditionally sets CPP to /lib/cpp and uses that (resulting in every
subsequent use of $(CPP) failing).
The first thing it tried (gcc -E) would actually work, but it doesn't know
that.
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2916#comment:7>
GRASS GIS <https://grass.osgeo.org>
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