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configure: Try compiler flags to get to C++11 (#2502)

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This commit is contained in:
Wilson Snyder 2020-08-17 07:40:07 -04:00
parent ea9b65fe6d
commit 698e0fbbd1
4 changed files with 24 additions and 20 deletions
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4
Makefile.in
View File

@ -89,7 +89,6 @@ datarootdir = @datarootdir@
CFG_WITH_CCWARN = @CFG_WITH_CCWARN@
CFG_WITH_DEFENV = @CFG_WITH_DEFENV@
CFG_WITH_LONGTESTS = @CFG_WITH_LONGTESTS@
CFG_WITH_THREADED = @CFG_WITH_THREADED@
PACKAGE_VERSION = @PACKAGE_VERSION@
#### End of system configuration section. ####
@ -546,9 +545,6 @@ dist-file-list:
@echo $(wildcard $(DISTFILES))
@echo "end-dist-file-list:"; # Scripts look for this
print-cfg-with-threaded:
@echo $(CFG_WITH_THREADED)
######################################################################
# Distributions

34
configure.ac
View File

@ -394,12 +394,17 @@ _MY_LDLIBS_CHECK_IFELSE(
fi])
AC_SUBST(CFG_LIBS)
# Set CFG_WITH_THREADED if can support threading
AC_MSG_CHECKING(whether $CXX supports Verilated threads)
ACO_SAVE_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_STD_NEWEST $CFG_CXXFLAGS_NO_UNUSED"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <thread>], [[ ]])],
# Need C++11 at least
#Alternative: AX_CXX_COMPILE_STDCXX([11])
AC_DEFUN([_MY_CXX_CHECK_CXX_VER],
[# _MY_CXX_CHECK_CXX_VER(flag) -- Check if compiler runs C++11
# Set $_my_result
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <thread>
#if (__cplusplus < 201103L)
# error "Too old"
#endif
], [[ ]])],
[_my_result=yes
if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
@ -407,13 +412,18 @@ AC_LINK_IFELSE(
fi
fi],
[_my_result=no])
CFG_WITH_THREADED=$_my_result
AC_SUBST(CFG_WITH_THREADED)
AC_MSG_RESULT($CFG_WITH_THREADED)
CXXFLAGS="$ACO_SAVE_CXXFLAGS"
])
# Check compiler flag
if test "$CFG_WITH_THREADED" = "no" ; then
AC_MSG_CHECKING(whether $CXX supports C++11)
_MY_CXX_CHECK_CXX_VER()
AC_MSG_RESULT($_my_result)
if test "$_my_result" = "no" ; then
CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_STD_NEWEST"
AC_MSG_CHECKING(whether $CXX supports C++11 with $CFG_CXXFLAGS_STD_NEWEST)
_MY_CXX_CHECK_CXX_VER()
AC_MSG_RESULT($_my_result)
fi
if test "$_my_result" = "no" ; then
AC_MSG_NOTICE([[]])
AC_MSG_ERROR([[the $CXX compiler appears to not support C++11.

2
include/verilatedos.h
View File

@ -122,7 +122,7 @@
# if defined(_MSC_VER) && _MSC_VER >= 1900
# define VL_THREAD_LOCAL thread_local
# elif defined(__GNUC__)
# if (__cplusplus < 201103L) && !defined(VL_THREADED_NO_C11_WARNING)
# if (__cplusplus < 201103L)
# error "VL_THREADED/--threads support requires C++-11 or newer only; use newer compiler"
# endif
# else

4
test_regress/driver.pl
View File

@ -2250,10 +2250,8 @@ sub cxx_version {
return $_Cxx_Version;
}
our $_Cfg_With_Threaded;
sub cfg_with_threaded {
$_Cfg_With_Threaded ||= `$ENV{MAKE} -C $ENV{VERILATOR_ROOT} -f Makefile print-cfg-with-threaded`;
return ($_Cfg_With_Threaded =~ /yes/i) ? 1:0;
return 1; # C++11 now always required
}
sub tries {