[gambit-list] on macos: clang over gcc

Ben mailist.ben at srctxt.com
Fri Oct 6 03:51:33 EDT 2017


maybe this is of interest ...

I couldn't install gcc-7 with brew but gcc-6. 

This will not compile:

    ./configure --enable-single-host CC=gcc-6
     make
....
making all in lib
gcc-6 -Wno-unused -Wno-write-strings -Wdisabled-optimization -O1 -fwrapv
-fno-strict-aliasing -fno-trapping-math -fno-math-errno
-fschedule-insns2 -fomit-frame-pointer -fPIC -fno-common -mieee-fp
-mpc64   -I"../include" -c -o "_kernel.o" -I. -DHAVE_CONFIG_H
-D___GAMBITDIR="\"/usr/local/Gambit\"" -D___SYS_TYPE_CPU="\"x86_64\""
-D___SYS_TYPE_VENDOR="\"apple\"" -D___SYS_TYPE_OS="\"darwin16.7.0\""
-D___CONFIGURE_COMMAND="\"./configure '--enable-single-host'
'CC=gcc-6'"\" -D___OBJ_EXTENSION="\".o\"" -D___EXE_EXTENSION="\"\""
-D___BAT_EXTENSION="\"\"" -D___PRIMAL _kernel.c -D___LIBRARY
_kernel.c: In function '___H__20___kernel':
_kernel.c:6346:27: error: void value not ignored as it ought to be
    ___FLONUM_VAL(___ARG2) = ___set_heartbeat_interval
    (___FLONUM_VAL(___ARG1));
                           ^
make[1]: *** [_kernel.o] Error 1
make: *** [all-recursive] Error 1


On Wed, Sep 20, 2017, at 04:37 PM, Marc Feeley wrote:
> By default the configure script searches for gcc before looking for
> clang.  However… X-code installs “clang” and also “gcc”, and that “gcc”
> is not the GNU gcc… it is a wrapper around clang/llvm.  So to install the
> GNU gcc you need to use homebrew like this:
> 
> % brew install gcc-7
> 
> and then tell the configure script to use that compiler:
> 
> % ./configure --enable-single-host CC=gcc-7
> 
> You will notice a dramatic decrease in compilation time and in execution
> time (about 3 or 4 times faster execution if I recall correctly).  On my
> machine a “make -j8” after a “make clean” takes 30 seconds.
> 
> Marc
> 
> 
> 
> > On Sep 20, 2017, at 3:18 AM, Ben <mailist.ben at srctxt.com> wrote:
> > 
> > hi
> > On macos sierra running the ./configure script gives me the following
> > message:
> > 
> > *** The clang compiler is being used.  Please be aware that the build 
> > ***
> > *** may take a very long time (over 30 minutes on a fairly fast       
> > ***
> > *** machine with clang 3.0).  Configuring with GNU GCC will give a    
> > ***
> > *** faster build (1 min on the same machine with GNU GCC 4.2.1) and   
> > ***
> > *** the executable will be faster.    
> > 
> > 
> > What can I do to enforce GCC? I cannot see any specific configure
> > --options
> > 
> > Attached you'll find the entire configure log.
> > 
> > Thanks,
> > Ben
> > 
> > <configure.log>_______________________________________________
> > Gambit-list mailing list
> > Gambit-list at iro.umontreal.ca
> > https://webmail.iro.umontreal.ca/mailman/listinfo/gambit-list
> 



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