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Date: Wed, 4 May 2016 13:09:05 +0900
From: Masahiro Yamada <>
To: Emese Revfy <>
Cc: Linux Kbuild mailing list <>,
        PaX Team <>,
        Brad Spengler <>,, Michal Marek <>,
        Kees Cook <>,
        Rasmus Villemoes <>,
        Fengguang Wu <>,
        Dmitry Vyukov <>,
        Linux Kernel Mailing List <>,
        David Brown <>
Subject: Re: [PATCH v7 1/6] Shared library support

Hi Emese,

2016-05-04 6:29 GMT+09:00 Emese Revfy <>:
> On Tue, 3 May 2016 11:00:56 +0900
> Masahiro Yamada <> wrote:
> Hi,
>> # Compile .c file, create position independent .o file
>> # host-cxxshobjs -> .o
>> quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
>>       cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
>>                            $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
>>                            $(call if_changed_dep,host-cxxshobjs)
>> We generally use HOSTCC to compile *.c files,
>> and HOSTCXX to compile *.cc files.
>> But, here, you mention to use HOSTCXX to compile .c files
>> such as cyc_complexity_plugin.c, sancov_plugin.c, etc.
>> This is not straight-forward.  It is worthwhile to comment the reason.
> I wrote a comment about it here:

+# Note that plugin capable gcc versions can be either C or C++ based
+# therefore plugin source files have to be compilable in both C and C++ mode.
+# This is why a C++ compiler is invoked on a .c file.


Please let me confirm if I understood correctly.

We generally have to do something with the name-space conflict
(with 'extern "C"') in the mixture of C/C++.

Depending on the GCC version,
GCC-plugin-related libraries could be built for C or C++.

So, we need to check the GCC version and choose correct one
from C or C++.

Am I right?

Best Regards
Masahiro Yamada

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