On Wed, 2018-06-06 at 23:30 -0500, Bruce Dubbs wrote: > On 06/06/2018 04:39 PM, Wayne Blaszczyk wrote: > > On Wed, 2018-06-06 at 22:45 +0200, Christopher Gregory wrote: > > > In the command explanation section it has the following note: > > > > > > CC=gcc: This environment variable ensures that gcc is used, if clang is > > > installed. Remove it, if you prefer to use clang. Using clang almost > > > doubles build time and slightly decreases build disk > > > space. Installed disk space is not appreciably modified. > > > > > > I found that just having CC=gcc was not enough to get this to correctly > > > build, as for some reason the build would still try using clang to, if I > > > have the term correct, linking, ie using clang > > > equivalent of g++ > > > > > > This was not my doing. I am just following what is currently listed in > > > svn for the instructions for both systemd version and for sysv of the > > > book. > > > Christopher. > > FWIW, I've been using both CC=gcc CXX=g++ in my Cups build for quite some > > time, for the very same reason mentioned by Christopher. > > Looking back at my history, it was at the time when > > -DLLVM_LINK_LLVM_DYLIB=ON was added to llvm. > > Wayne. > > I don't dny your experience, but I have in my logs/scripts: > > Fri May 11 20:34:12 CDT 2018 /usr/src/llvm/llvm-6.0.0.src.tar.xz > Tue May 15 16:10:10 CDT 2018 /usr/src/cups/cups-2.2.7-source.tar.gz > > CC=gcc \ > ./configure --libdir=/usr/lib \ > --disable-systemd \ > --with-rcdir=/tmp/cupsinit \ > --with-system-groups=lpadmin \ > --with-docdir=/usr/share/cups/doc-$VER > > For llvm I do have -DLLVM_LINK_LLVM_DYLIB=ON > > In my cups build log I have: > > Using CC=gcc > Using CXX=gcc > > In my build directory, there are no .cc or .cpp files. > > I cannot duplicate the issue. > > You might want to run 'make --trace' to get a verbose listing to see > what is happening. > > Also take a look at the Makedefs file. The relevant definitions I have > does have CXX = clang++ and DSOXX = $(CXX) and LD_CXX = $(CXX). There > are some cxx files in the scheduler/ and ppdc/ directories. > > I do note that my build log also has: > > Compiling cups-driverd.cxx... > warning: unknown warning option '-Wno-format-truncation' > [-Wunknown-warning-option] > > But that didn't break the build for me. > > -- Bruce > > > > > -- Bruce
I build llvm and clang separately and use slightly different parameters to the book, hence why I didn't report this issue myself. But looking at the configure script, (and I'm not expert reading these scripts), but to me it looks like if it finds clang++, it will use it rather than g++. I would be interested in your configure output around this area: checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for clang++... clang++ checking whether we are using the GNU C++ compiler... yes checking whether clang++ accepts -g... yes checking for ranlib... ranlib checking for ar... /usr/bin/ar checking for chmod... /bin/chmod Wayne. -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
