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Add a check to configure that the libstdc++ selected by Clang isn't
libstdc++v4.6. This is quite hard to test directly, so we test for it by checking a known missing feature in that version that was added in v4.7. This should prevent users from upgrading Clang but not GCC and hosting with a too-old GCC's libstdc++ and getting strange and hard to debug errors when we switch to C++11 by default. Also, switch several of the macros I introduced to use AC_LANG_SOURCE rather than AC_LANG_PROGRAM as we don't need configure's help writing our main function (and we don't need such a function at all for most of the tests). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199313 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
parent
f62176f047
commit
9c62b5eabb
@ -102,15 +102,15 @@ dnl other possible compilers.
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AC_MSG_CHECKING([whether GCC or Clang is our host compiler])
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AC_LANG_PUSH([C++])
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llvm_cv_cxx_compiler=unknown
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#if ! __clang__
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#error
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#endif
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]])],
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#if ! __clang__
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#error
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#endif
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]])],
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llvm_cv_cxx_compiler=clang,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#if ! __GNUC__
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#error
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#endif
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]])],
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#if ! __GNUC__
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#error
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#endif
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]])],
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llvm_cv_cxx_compiler=gcc, [])])
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AC_LANG_POP([C++])
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AC_MSG_RESULT([${llvm_cv_cxx_compiler}])
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@ -129,7 +129,7 @@ case "$enableval" in
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case "$llvm_cv_cxx_compiler" in
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clang)
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AC_MSG_CHECKING([whether Clang is new enough])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#if __clang_major__ < 3 || (__clang_major__ == 3 && __clang_minor__ < 1)
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#error This version of Clang is too old to build LLVM
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#endif
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@ -140,10 +140,34 @@ case "$enableval" in
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The selected Clang compiler is not new enough to build LLVM. Please upgrade to
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Clang 3.1. You may pass --disable-compiler-version-checks to configure to
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bypass these sanity checks.])])
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dnl Note that libstdc++4.6 is known broken for C++11 builds. The errors
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dnl are sometimes deeply confusing though. Here we test for an obvious
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dnl incomplete feature in 4.6's standard library that was completed in
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dnl 4.7's.
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AC_MSG_CHECKING([whether Clang will select a modern C++ standard library])
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llvm_cv_old_cxxflags="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS -std=c++0x"
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AC_LINK_IFELSE([AC_LANG_SOURCE([[
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#include <atomic>
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std::atomic<float> x(0.0f);
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int main() { return (float)x; }
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]])],
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[AC_MSG_RESULT([yes])],
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[AC_MSG_RESULT([no])
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AC_MSG_ERROR([
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We detected a missing feature in the standard C++ library that was known to be
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missing in libstdc++4.6 and implemented in libstdc++4.7. There are numerous
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C++11 problems with 4.6's library, and we don't support GCCs or libstdc++ older
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than 4.7. You will need to update your system and ensure Clang uses the newer
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standard library.
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If this error is incorrect or you need to force things to work, you may pass
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'--disable-compiler-version-checks' to configure to bypass this test.])])
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;;
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gcc)
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AC_MSG_CHECKING([whether GCC is new enough])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
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#error This version of GCC is too old to build LLVM
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#endif
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120
configure
vendored
120
configure
vendored
@ -3593,16 +3593,9 @@ cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#if ! __clang__
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#error
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#endif
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#error
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#endif
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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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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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@ -3650,16 +3643,9 @@ cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#if ! __GNUC__
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#error
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#endif
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#error
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#endif
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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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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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@ -3748,13 +3734,6 @@ cat >>conftest.$ac_ext <<_ACEOF
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#error This version of Clang is too old to build LLVM
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#endif
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int
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main ()
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{
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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@ -3810,6 +3789,88 @@ bypass these sanity checks." >&2;}
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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{ echo "$as_me:$LINENO: checking whether Clang will select a modern C++ standard library" >&5
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echo $ECHO_N "checking whether Clang will select a modern C++ standard library... $ECHO_C" >&6; }
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llvm_cv_old_cxxflags="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS -std=c++0x"
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <atomic>
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std::atomic<float> x(0.0f);
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int main() { return (float)x; }
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_ACEOF
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rm -f conftest.$ac_objext conftest$ac_exeext
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if { (ac_try="$ac_link"
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case "(($ac_try" in
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*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
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*) ac_try_echo=$ac_try;;
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esac
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eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_link") 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -z "$ac_cxx_werror_flag" || test ! -s conftest.err'
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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 "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_try") 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } &&
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{ ac_try='test -s conftest$ac_exeext'
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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 "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
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(eval "$ac_try") 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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{ echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6; }
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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{ echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6; }
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{ { echo "$as_me:$LINENO: error:
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We detected a missing feature in the standard C++ library that was known to be
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missing in libstdc++4.6 and implemented in libstdc++4.7. There are numerous
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C++11 problems with 4.6's library, and we don't support GCCs or libstdc++ older
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than 4.7. You will need to update your system and ensure Clang uses the newer
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standard library.
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If this error is incorrect or you need to force things to work, you may pass
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'--disable-compiler-version-checks' to configure to bypass this test." >&5
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echo "$as_me: error:
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We detected a missing feature in the standard C++ library that was known to be
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missing in libstdc++4.6 and implemented in libstdc++4.7. There are numerous
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C++11 problems with 4.6's library, and we don't support GCCs or libstdc++ older
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than 4.7. You will need to update your system and ensure Clang uses the newer
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standard library.
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If this error is incorrect or you need to force things to work, you may pass
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'--disable-compiler-version-checks' to configure to bypass this test." >&2;}
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{ (exit 1); exit 1; }; }
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fi
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rm -f core conftest.err conftest.$ac_objext \
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conftest$ac_exeext conftest.$ac_ext
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;;
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gcc)
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{ echo "$as_me:$LINENO: checking whether GCC is new enough" >&5
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@ -3825,13 +3886,6 @@ cat >>conftest.$ac_ext <<_ACEOF
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#error This version of GCC is too old to build LLVM
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#endif
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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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rm -f conftest.$ac_objext
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if { (ac_try="$ac_compile"
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@ -10606,7 +10660,7 @@ else
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lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
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lt_status=$lt_dlunknown
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cat > conftest.$ac_ext <<EOF
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#line 10609 "configure"
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#line 10663 "configure"
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#include "confdefs.h"
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#if HAVE_DLFCN_H
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