forked from OSchip/llvm-project
Configure: if we compile with clang, check that it is not broken
Some linux distibutions (for example, Mageia 2, Fedora 17) ship Clang that is essentially broken for the end user. Clang can not find or compile libstdc++ headers. The issue is that our configure prefers clang over gcc, thus selecting a broken Clang when a working GCC is available. Now we detect this issue by compiling a simple program. If it does not compile, configure stops with an error suggesting the user to select a different compiler. llvm-svn: 171975
This commit is contained in:
Dmitri Gribenko
parent
52b1515405
commit
06358bd078
|
|
@ -65,6 +65,32 @@ AC_PROG_CC(clang llvm-gcc gcc)
|
|||
AC_PROG_CXX(clang++ llvm-g++ g++)
|
||||
AC_PROG_CPP
|
||||
|
||||
dnl If CXX is Clang, check that it can find and parse C++ standard library
|
||||
dnl headers.
|
||||
if test "$CXX" = "clang++" ; then
|
||||
AC_MSG_CHECKING([whether clang works])
|
||||
AC_LANG_PUSH([C++])
|
||||
dnl Note that space between 'include' and '(' is required. There's a broken
|
||||
dnl regex in aclocal that otherwise will think that we call m4's include
|
||||
dnl builtin.
|
||||
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <limits>
|
||||
#if __has_include (<cxxabi.h>)
|
||||
#include <cxxabi.h>
|
||||
#endif
|
||||
#if __has_include (<unwind.h>)
|
||||
#include <unwind.h>
|
||||
#endif
|
||||
]])],
|
||||
[
|
||||
AC_MSG_RESULT([yes])
|
||||
],
|
||||
[
|
||||
AC_MSG_RESULT([no])
|
||||
AC_MSG_ERROR([Selected compiler could not find or parse C++ standard library headers. Rerun with CC=c-compiler CXX=c++-compiler ./configure ...])
|
||||
])
|
||||
AC_LANG_POP([C++])
|
||||
fi
|
||||
|
||||
dnl Configure all of the projects present in our source tree. While we could
|
||||
dnl just AC_CONFIG_SUBDIRS on the set of directories in projects that have a
|
||||
dnl configure script, that usage of the AC_CONFIG_SUBDIRS macro is deprecated.
|
||||
|
|
|
|||
|
|
@ -3471,6 +3471,98 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
|
|||
ac_compiler_gnu=$ac_cv_c_compiler_gnu
|
||||
|
||||
|
||||
if test "$CXX" = "clang++" ; then
|
||||
{ echo "$as_me:$LINENO: checking whether clang works" >&5
|
||||
echo $ECHO_N "checking whether clang works... $ECHO_C" >&6; }
|
||||
ac_ext=cpp
|
||||
ac_cpp='$CXXCPP $CPPFLAGS'
|
||||
ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
|
||||
ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
|
||||
ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
|
||||
|
||||
|
||||
cat >conftest.$ac_ext <<_ACEOF
|
||||
/* confdefs.h. */
|
||||
_ACEOF
|
||||
cat confdefs.h >>conftest.$ac_ext
|
||||
cat >>conftest.$ac_ext <<_ACEOF
|
||||
/* end confdefs.h. */
|
||||
#include <limits>
|
||||
#if __has_include (<cxxabi.h>)
|
||||
#include <cxxabi.h>
|
||||
#endif
|
||||
#if __has_include (<unwind.h>)
|
||||
#include <unwind.h>
|
||||
#endif
|
||||
|
||||
int
|
||||
main ()
|
||||
{
|
||||
|
||||
;
|
||||
return 0;
|
||||
}
|
||||
_ACEOF
|
||||
rm -f conftest.$ac_objext
|
||||
if { (ac_try="$ac_compile"
|
||||
case "(($ac_try" in
|
||||
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
|
||||
*) ac_try_echo=$ac_try;;
|
||||
esac
|
||||
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
|
||||
(eval "$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_cxx_werror_flag" || test ! -s conftest.err'
|
||||
{ (case "(($ac_try" in
|
||||
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
|
||||
*) ac_try_echo=$ac_try;;
|
||||
esac
|
||||
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
|
||||
(eval "$ac_try") 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; } &&
|
||||
{ ac_try='test -s conftest.$ac_objext'
|
||||
{ (case "(($ac_try" in
|
||||
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
|
||||
*) ac_try_echo=$ac_try;;
|
||||
esac
|
||||
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
|
||||
(eval "$ac_try") 2>&5
|
||||
ac_status=$?
|
||||
echo "$as_me:$LINENO: \$? = $ac_status" >&5
|
||||
(exit $ac_status); }; }; then
|
||||
|
||||
{ echo "$as_me:$LINENO: result: yes" >&5
|
||||
echo "${ECHO_T}yes" >&6; }
|
||||
|
||||
else
|
||||
echo "$as_me: failed program was:" >&5
|
||||
sed 's/^/| /' conftest.$ac_ext >&5
|
||||
|
||||
|
||||
{ echo "$as_me:$LINENO: result: no" >&5
|
||||
echo "${ECHO_T}no" >&6; }
|
||||
{ { echo "$as_me:$LINENO: error: Selected compiler could not find or parse C++ standard library headers. Rerun with CC=c-compiler CXX=c++-compiler ./configure ..." >&5
|
||||
echo "$as_me: error: Selected compiler could not find or parse C++ standard library headers. Rerun with CC=c-compiler CXX=c++-compiler ./configure ..." >&2;}
|
||||
{ (exit 1); exit 1; }; }
|
||||
|
||||
fi
|
||||
|
||||
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
|
||||
ac_ext=c
|
||||
ac_cpp='$CPP $CPPFLAGS'
|
||||
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
|
||||
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
|
||||
ac_compiler_gnu=$ac_cv_c_compiler_gnu
|
||||
|
||||
fi
|
||||
|
||||
|
||||
|
||||
if test -d ${srcdir}/projects/llvm-gcc ; then
|
||||
|
|
@ -10393,7 +10485,7 @@ else
|
|||
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
|
||||
lt_status=$lt_dlunknown
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 10396 "configure"
|
||||
#line 10488 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
#if HAVE_DLFCN_H
|
||||
|
|
@ -16330,7 +16422,6 @@ rm -f core conftest.err conftest.$ac_objext \
|
|||
|
||||
|
||||
|
||||
|
||||
{ echo "$as_me:$LINENO: checking for HUGE_VAL sanity" >&5
|
||||
echo $ECHO_N "checking for HUGE_VAL sanity... $ECHO_C" >&6; }
|
||||
if test "${ac_cv_huge_val_sanity+set}" = set; then
|
||||
|
|
|
|||
Loading…
Reference in New Issue