fedora 20: gcc installation does not support plugins

[joe]

Hi,

I'm having the same issue as this one here https://forums.grsecurity.net/viewtopic.php?f=3&t=3484

I'm using Fedora 20.

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Your gcc installation does not support plugins.  If the necessary headers for plugin support are missing, they should be installed.  On Debian, apt-get install gcc-<ver>-plugin-dev.  If you choose to ignore this error and lessen the improvements provided by this patch, re-run make with the DISABLE_PAX_PLUGINS=y argument..  Stop.


I tried to collect all information requested in that other thread for debugging:

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gcc -E -shared - -o /dev/null -I`gcc -print-file-name=plugin`/include 2>&1 <<EOF
> #include "gcc-plugin.h"
> #include "tree.h"
> #include "tm.h"
> #include "rtl.h"
> #ifdef ENABLE_BUILD_WITH_CXX
> #warning g++
> #else
> #warning gcc
> #endif
> EOF


output:

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<stdin>:8:2: warning: #warning gcc [-Wcpp]


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rpm -qa gcc*
gcc-4.8.2-7.fc20.x86_64
gcc-plugin-devel-4.8.2-7.fc20.x86_64


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bash ./scripts/gcc-plugin.sh gcc g++ gcc
g++


Do you have any hints for me on how to find out why it fails or how this issue can be fixed?

thanks in advance!

[PaX Team]

which grsec version are you using? also try to run bash -x scripts/gcc-plugin.sh g++ g++ gcc and post me the output please.

[joe]

sorry forgot about the grsec version:
grsecurity-3.0-3.14.6-201406101411

[ updated: removed irrelevant cmd output ]

[joe]

the previous post did not contain the actual requested command, but here we go:

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bash -x scripts/gcc-plugin.sh g++ g++ gcc
++ dirname scripts/gcc-plugin.sh
+ srctree=scripts
++ gcc -print-file-name=plugin
+ gccplugins_dir=/usr/lib/gcc/x86_64-redhat-linux/4.8.2/plugin
++ g++ -E -shared - -o /dev/null -Iscripts/../tools/gcc -I/usr/lib/gcc/x86_64-redhat-linux/4.8.2/plugin/include
+ plugincc='scripts/gcc-plugin.sh: line 12: g++: command not found'
+ '[' 127 -eq 0 ']'


[joe]

installing it fixed the issue:

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yum install gcc-c++


thank you!!

[PaX Team]

yes, from gcc 4.8 on you need g++ (or any capable c++ compiler, clang works too) to compile gcc plugins as gcc itself is compiled as c++ code (gcc 4.7 supports both ways, most distros opted for c++ mode already at that time, the gcc-plugin.sh scripts detects this too).