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
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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Reference in New Issue
Block a user