RE: libcilkrts breaks non-bootstrap build

["Iyer, Balaji V" <balaji dot v dot iyer at intel dot com>]

Hi Tom,
	Please see my response below:

Thanks,

Balaji V. Iyer.

> -----Original Message-----
> From: Tom de Vries [mailto:Tom_deVries@mentor.com]
> Sent: Monday, November 4, 2013 2:15 PM
> To: gcc@gcc.gnu.org
> Cc: Iyer, Balaji V
> Subject: libcilkrts breaks non-bootstrap build
> 
> Hi,
> 
> When configuring a gcc build with "--disable-bootstrap --enable-
> languages=c" I run into this error:
> ...
> libtool: compile:  g++
> -B/home/vries/gcc_versions/devel/lean-c/install/x86_64-unknown-linux-
> gnu/bin/
> -B/home/vries/gcc_versions/devel/lean-c/install/x86_64-unknown-linux-
> gnu/lib/
> -isystem
> /home/vries/gcc_versions/devel/lean-c/install/x86_64-unknown-linux-
> gnu/include
> -isystem
> /home/vries/gcc_versions/devel/lean-c/install/x86_64-unknown-linux-
> gnu/sys-include
> "-DPACKAGE_NAME=\"Cilk Runtime Library\""
> -DPACKAGE_TARNAME=\"cilk-runtime-library\" -
> DPACKAGE_VERSION=\"2.0\"
> "-DPACKAGE_STRING=\"Cilk Runtime Library 2.0\""
> -DPACKAGE_BUGREPORT=\"cilk@intel.com\" -DPACKAGE_URL=\"\"
> -DPACKAGE=\"cilk-runtime-library\" -DVERSION=\"2.0\" -DSTDC_HEADERS=1
> -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -
> DHAVE_STRING_H=1
> -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -
> DHAVE_STDINT_H=1
> -DHAVE_UNISTD_H=1 -DHAVE_ALLOCA_H=1 -DHAVE_ALLOCA=1 -
> DHAVE_DLFCN_H=1 -DLT_OBJDIR=\".libs/\" -I. -
> I/home/vries/gcc_versions/devel/src/libcilkrts
> -I/home/vries/gcc_versions/devel/src/libcilkrts/include
> -I/home/vries/gcc_versions/devel/src/libcilkrts/runtime
> -I/home/vries/gcc_versions/devel/src/libcilkrts/runtime/config/x86
> -DIN_CILK_RUNTIME=1 -D_Cilk_spawn= -D_Cilk_sync= -D_Cilk_for=for -
> fcilkplus -g3
> -O0 -dH -D_GNU_SOURCE -MT bug.lo -MD -MP -MF .deps/bug.Tpo -c
> /home/vries/gcc_versions/devel/src/libcilkrts/runtime/bug.cpp  -fPIC -DPIC -
> o .libs/bug.o
> g++: error: unrecognized command line option '-fcilkplus'
> make[2]: *** [bug.lo] Error 1
> make[2]: Leaving directory
> `/home/vries/gcc_versions/devel/lean-c/build/x86_64-unknown-linux-
> gnu/libcilkrts'
> ...
> 
> The error occurs because the compiler doesn't support -fcilkplus.
> 
> Should configure disable libcilkplus when c++ is not enabled?
> 

Yes, I should do that. Thanks for catching this.

> I see the same error with "--disable-bootstrap --enable-languages=c,c++".
> Should configure test the compiler for support of -fcilkplus and disable
> libcilkplus if not?
> 

Hmm, I generally build using the two flags and it always works for me. Let me try it again and get back to you.



> Thanks,
> - Tom