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📄 configure

📁 glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料
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# This file is generated from configure.in by Autoconf.  DO NOT EDIT! # Local configure fragment for sysdeps/ieee754/ldbl-opt/.echo "$as_me:$LINENO: checking whether $CC $CFLAGS supports -mlong-double-128" >&5echo $ECHO_N "checking whether $CC $CFLAGS supports -mlong-double-128... $ECHO_C" >&6if test "${libc_cv_mlong_double_128+set}" = set; then  echo $ECHO_N "(cached) $ECHO_C" >&6else  save_CFLAGS="$CFLAGS"CFLAGS="$CFLAGS -mlong-double-128"cat >conftest.$ac_ext <<_ACEOF/* confdefs.h.  */_ACEOFcat confdefs.h >>conftest.$ac_extcat >>conftest.$ac_ext <<_ACEOF/* end confdefs.h.  */intmain (){#ifndef __LONG_DOUBLE_128__# error "compiler did not predefine __LONG_DOUBLE_128__ as expected"#endiflong double foobar (long double x) { return x; }  ;  return 0;}_ACEOFrm -f conftest.$ac_objextif { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5  (eval $ac_compile) 2>conftest.er1  ac_status=$?  grep -v '^ *+' conftest.er1 >conftest.err  rm -f conftest.er1  cat conftest.err >&5  echo "$as_me:$LINENO: \$? = $ac_status" >&5  (exit $ac_status); } &&	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5  (eval $ac_try) 2>&5  ac_status=$?  echo "$as_me:$LINENO: \$? = $ac_status" >&5  (exit $ac_status); }; } &&	 { ac_try='test -s conftest.$ac_objext'  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5  (eval $ac_try) 2>&5  ac_status=$?  echo "$as_me:$LINENO: \$? = $ac_status" >&5  (exit $ac_status); }; }; then  libc_cv_mlong_double_128=yeselse  echo "$as_me: failed program was:" >&5sed 's/^/| /' conftest.$ac_ext >&5libc_cv_mlong_double_128=nofirm -f conftest.err conftest.$ac_objext conftest.$ac_extCFLAGS="$save_CFLAGS"fiecho "$as_me:$LINENO: result: $libc_cv_mlong_double_128" >&5echo "${ECHO_T}$libc_cv_mlong_double_128" >&6if test "$libc_cv_mlong_double_128" = no; then  { { echo "$as_me:$LINENO: error: this configuration requires -mlong-double-128 support" >&5echo "$as_me: error: this configuration requires -mlong-double-128 support" >&2;}   { (exit 1); exit 1; }; }fi

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