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Detect linker requirements for multithreaded runtime.

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This commit is contained in:
Wilson Snyder 2018-05-13 19:47:35 -04:00
parent 9ba6fc9279
commit 4abf5be9ce
2 changed files with 38 additions and 0 deletions
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35
configure.ac
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@ -165,6 +165,34 @@ AC_DEFUN([_MY_CXX_CHECK_OPT],
fi
])
AC_DEFUN([_MY_LDLIBS_CHECK_FLAG],
[# _MY_LDLIBS_CHECK_FLAG(flag) -- Check if linker supports specific options
# Set $_my_result appropriately
ACO_SAVE_LIBS="$LIBS"
LIBS="$LIBS $1"
AC_MSG_CHECKING([whether $CXX linker accepts $1])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[]])],
[_my_result=yes
if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
_my_result=no
fi
fi],
[_my_result=no])
AC_MSG_RESULT($_my_result)
LIBS="$ACO_SAVE_LIBS"
])
AC_DEFUN([_MY_LDLIBS_CHECK_OPT],
[# _MY_LDLIBS_CHECK_OPT(flag) -- Check if linker supports specific options
# If it does, append flag to variable
_MY_LDLIBS_CHECK_FLAG($2)
if test "$_my_result" = "yes" ; then
$1="$$1 $2"
fi
])
# Flag to select newest language standard supported
# Macros work such that first option that passes is the one we take
# gnu++14 is the newest that Verilator supports
@ -232,6 +260,13 @@ _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-unused-variable)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-Wno-shadow)
AC_SUBST(CFG_CXXFLAGS_NO_UNUSED)
# Find multithread linker flags
_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-mt)
_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-pthread)
_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-lpthread)
_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,-latomic)
AC_SUBST(CFG_LDLIBS_THREADS)
# Set CFG_WITH_THREADED if can support threading
AC_MSG_CHECKING(whether $CXX supports Verilated threads)
ACO_SAVE_CXXFLAGS="$CXXFLAGS"

3
include/verilated.mk.in
View File

@ -24,6 +24,8 @@ CFG_CXXFLAGS_STD_OLDEST = @CFG_CXXFLAGS_STD_OLDEST@
CFG_CXXFLAGS_NO_UNUSED = @CFG_CXXFLAGS_NO_UNUSED@
# Compiler flags that turn on extra warnings
CFG_CXXFLAGS_WEXTRA = @CFG_CXXFLAGS_WEXTRA@
# Linker libraries for multithreading
CFG_LDLIBS_THREADS = @CFG_LDLIBS_THREADS@
######################################################################
# Programs
@ -116,6 +118,7 @@ ifneq ($(VM_THREADS),0)
ifneq ($(VM_THREADS),)
# Need C++11 at least, so always default to newest
CPPFLAGS += -DVL_THREADED $(CFG_CXXFLAGS_STD_NEWEST)
LDLIBS += $(CFG_LDLIBS_THREADS)
endif
endif