Prefer clang over gcc.
We want to use clang on systems where clang is the system compiler. It is less common to have clang installed on systems where gcc is the system compiler.
This commit is contained in:
Todd C. Miller
4
INSTALL
4
INSTALL
@@ -15,6 +15,10 @@ operating system (any modern version of BSD, Linux or Unix should work),
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an ANSI/ISO C compiler that supports the "long long" type, variadic
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macros (a C99 feature) as well as the ar, make and ranlib utilities.
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The configure script will attempt to use clang, gcc or cc as the C
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compiler (in that order). You may set the CC environment variable
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to the C compiler of your choice to overide this.
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If you wish to modify the parser then you will need flex version
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2.5.2 or later and either bison or byacc (sudo comes with a
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pre-generated parser). You'll also have to run configure with the
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347
configure
vendored
347
configure
vendored
@@ -16579,6 +16579,353 @@ if test -n "$with_libraries"; then
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done
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fi
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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if test -n "$ac_tool_prefix"; then
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for ac_prog in clang gcc
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do
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# Extract the first word of "$ac_tool_prefix$ac_prog", so it can be a program name with args.
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set dummy $ac_tool_prefix$ac_prog; ac_word=$2
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
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$as_echo_n "checking for $ac_word... " >&6; }
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if ${ac_cv_prog_CC+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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if test -n "$CC"; then
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ac_cv_prog_CC="$CC" # Let the user override the test.
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else
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as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
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for as_dir in $PATH
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do
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IFS=$as_save_IFS
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test -z "$as_dir" && as_dir=.
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for ac_exec_ext in '' $ac_executable_extensions; do
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if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
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ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
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$as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
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break 2
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fi
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done
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done
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IFS=$as_save_IFS
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fi
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fi
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CC=$ac_cv_prog_CC
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if test -n "$CC"; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
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$as_echo "$CC" >&6; }
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else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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fi
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test -n "$CC" && break
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done
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fi
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if test -z "$CC"; then
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ac_ct_CC=$CC
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for ac_prog in clang gcc
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do
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# Extract the first word of "$ac_prog", so it can be a program name with args.
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set dummy $ac_prog; ac_word=$2
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
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$as_echo_n "checking for $ac_word... " >&6; }
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if ${ac_cv_prog_ac_ct_CC+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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if test -n "$ac_ct_CC"; then
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ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
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else
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as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
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for as_dir in $PATH
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do
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IFS=$as_save_IFS
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test -z "$as_dir" && as_dir=.
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for ac_exec_ext in '' $ac_executable_extensions; do
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if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
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ac_cv_prog_ac_ct_CC="$ac_prog"
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$as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
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break 2
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fi
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done
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done
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IFS=$as_save_IFS
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fi
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fi
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ac_ct_CC=$ac_cv_prog_ac_ct_CC
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if test -n "$ac_ct_CC"; then
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
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$as_echo "$ac_ct_CC" >&6; }
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else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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fi
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test -n "$ac_ct_CC" && break
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done
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if test "x$ac_ct_CC" = x; then
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CC=""
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else
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case $cross_compiling:$ac_tool_warned in
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yes:)
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{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
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$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
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ac_tool_warned=yes ;;
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esac
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CC=$ac_ct_CC
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fi
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fi
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test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
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$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
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as_fn_error $? "no acceptable C compiler found in \$PATH
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See \`config.log' for more details" "$LINENO" 5; }
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# Provide some information about the compiler.
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$as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
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set X $ac_compile
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ac_compiler=$2
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for ac_option in --version -v -V -qversion; do
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{ { ac_try="$ac_compiler $ac_option >&5"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
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$as_echo "$ac_try_echo"; } >&5
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(eval "$ac_compiler $ac_option >&5") 2>conftest.err
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ac_status=$?
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if test -s conftest.err; then
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sed '10a\
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... rest of stderr output deleted ...
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10q' conftest.err >conftest.er1
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cat conftest.er1 >&5
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fi
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rm -f conftest.er1 conftest.err
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$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }
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done
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
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$as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
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if ${ac_cv_c_compiler_gnu+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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#ifndef __GNUC__
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choke me
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#endif
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_compiler_gnu=yes
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else
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ac_compiler_gnu=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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ac_cv_c_compiler_gnu=$ac_compiler_gnu
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_compiler_gnu" >&5
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$as_echo "$ac_cv_c_compiler_gnu" >&6; }
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if test $ac_compiler_gnu = yes; then
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GCC=yes
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else
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GCC=
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fi
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ac_test_CFLAGS=${CFLAGS+set}
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ac_save_CFLAGS=$CFLAGS
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
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$as_echo_n "checking whether $CC accepts -g... " >&6; }
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if ${ac_cv_prog_cc_g+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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ac_cv_prog_cc_g=no
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CFLAGS="-g"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_prog_cc_g=yes
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else
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CFLAGS=""
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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else
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="-g"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_prog_cc_g=yes
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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ac_c_werror_flag=$ac_save_c_werror_flag
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_g" >&5
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$as_echo "$ac_cv_prog_cc_g" >&6; }
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if test "$ac_test_CFLAGS" = set; then
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CFLAGS=$ac_save_CFLAGS
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elif test $ac_cv_prog_cc_g = yes; then
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if test "$GCC" = yes; then
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CFLAGS="-g -O2"
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else
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CFLAGS="-g"
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fi
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else
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if test "$GCC" = yes; then
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CFLAGS="-O2"
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else
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CFLAGS=
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fi
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
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$as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
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if ${ac_cv_prog_cc_c89+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_cv_prog_cc_c89=no
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ac_save_CC=$CC
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#include <stdarg.h>
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#include <stdio.h>
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struct stat;
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/* Most of the following tests are stolen from RCS 5.7's src/conf.sh. */
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struct buf { int x; };
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FILE * (*rcsopen) (struct buf *, struct stat *, int);
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static char *e (p, i)
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char **p;
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int i;
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{
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return p[i];
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}
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static char *f (char * (*g) (char **, int), char **p, ...)
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{
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char *s;
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va_list v;
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va_start (v,p);
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s = g (p, va_arg (v,int));
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va_end (v);
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return s;
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}
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/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default. It has
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function prototypes and stuff, but not '\xHH' hex character constants.
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These don't provoke an error unfortunately, instead are silently treated
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as 'x'. The following induces an error, until -std is added to get
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proper ANSI mode. Curiously '\x00'!='x' always comes out true, for an
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array size at least. It's necessary to write '\x00'==0 to get something
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that's true only with -std. */
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int osf4_cc_array ['\x00' == 0 ? 1 : -1];
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/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
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inside strings and character constants. */
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#define FOO(x) 'x'
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int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
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int test (int i, double x);
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struct s1 {int (*f) (int a);};
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struct s2 {int (*f) (double a);};
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int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
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int argc;
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char **argv;
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int
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main ()
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{
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return f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1];
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;
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return 0;
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}
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_ACEOF
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for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
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-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
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do
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CC="$ac_save_CC $ac_arg"
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if ac_fn_c_try_compile "$LINENO"; then :
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ac_cv_prog_cc_c89=$ac_arg
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fi
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rm -f core conftest.err conftest.$ac_objext
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test "x$ac_cv_prog_cc_c89" != "xno" && break
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done
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rm -f conftest.$ac_ext
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CC=$ac_save_CC
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fi
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# AC_CACHE_VAL
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case "x$ac_cv_prog_cc_c89" in
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x)
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
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$as_echo "none needed" >&6; } ;;
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xno)
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
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$as_echo "unsupported" >&6; } ;;
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*)
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CC="$CC $ac_cv_prog_cc_c89"
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
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$as_echo "$ac_cv_prog_cc_c89" >&6; } ;;
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esac
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if test "x$ac_cv_prog_cc_c89" != xno; then :
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fi
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ac_ext=c
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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case $ac_cv_prog_cc_stdc in #(
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no) :
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ac_cv_prog_cc_c99=no; ac_cv_prog_cc_c89=no ;; #(
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@@ -2350,6 +2350,7 @@ fi
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dnl
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dnl C compiler checks (to be done after os checks)
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||||
dnl
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AC_PROG_CC([clang gcc])
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AC_PROG_CC_STDC
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AC_C_CONST
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||||
AC_C_INLINE
|
||||
|
||||
Reference in New Issue
Block a user