Date: Wed, 4 May 2016 13:09:05 +0900 From: Masahiro Yamada <yamada.masahiro@...ionext.com> To: Emese Revfy <re.emese@...il.com> Cc: Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>, kernel-hardening@...ts.openwall.com, Michal Marek <mmarek@...e.com>, Kees Cook <keescook@...omium.org>, Rasmus Villemoes <linux@...musvillemoes.dk>, Fengguang Wu <fengguang.wu@...el.com>, Dmitry Vyukov <dvyukov@...gle.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, David Brown <david.brown@...aro.org> Subject: Re: [PATCH v7 1/6] Shared library support Hi Emese, 2016-05-04 6:29 GMT+09:00 Emese Revfy <re.emese@...il.com>: > On Tue, 3 May 2016 11:00:56 +0900 > Masahiro Yamada <yamada.masahiro@...ionext.com> 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: > https://github.com/ephox-gcc-plugins/gcc-plugins_linux-next/commit/74f6343a7f13c071e00c417332051e25f15009ea > +# 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. Thanks. 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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