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configure: Add a specific GCC test to guarantee user exported CXX=g++6

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This commit is contained in:
Jason Volk 2018-06-14 20:44:20 -06:00
parent b33b37e9e0
commit 67d912d16d
1 changed files with 24 additions and 0 deletions
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24
configure.ac
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@ -142,6 +142,30 @@ AM_CONDITIONAL([SOLARIS], [[[[ $host_os = *solaris* ]]]])
RB_DEFINE_UNQUOTED([OS], ["$host_os"], [Host operating system])
dnl
dnl The CXX standard check even with the sd6 check wasn't enough for GCC. This
dnl is because we're developing with C++15'ish, which is in some grey area
dnl between C++14 and C++17 and the implementation differs between GCC 5.x and
dnl GCC 6.x. The build will b0rk with GCC 5.x so the version must be checked.
dnl
AC_MSG_CHECKING(whether specific compiler version is sufficient)
AM_COND_IF([GCC],
[
gvmaj=`$CXX -dumpversion | cut -d"." -f1`
gvmin=`$CXX -dumpversion | cut -d"." -f2`
if [[ "$gvmaj" -ge "6" ]]; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([Did you forget to export CXX=g++-6 ?])
fi
], [
AC_MSG_RESULT([yes])
])
dnl ***************************************************************************
dnl Developer options