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Ensure autoconf doesn't downgrade us to C99

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* configure.ac: Add -std=gnu11 if the compiler is GCC (or clang).  This
  prevents AC_PROG_CC_C99 from downgrading us by adding -std=gnu99.
  Fixes regression whereby we were always using the fallback
  implementation of atomics.
This commit is contained in:
Andy Wingo 2016-11-27 20:56:59 +01:00
parent 668153dbb6
commit 7b6b86f255
1 changed files with 12 additions and 0 deletions
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12
configure.ac
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@ -66,6 +66,18 @@ AC_LIBTOOL_WIN32_DLL
AC_PROG_INSTALL
AC_PROG_CC
# Sadly, there is no released version of Autoconf with a nice
# C11-ensuring macro. This should work for gcc/clang within the last 5
# years though.
AC_MSG_CHECKING([how to enable C11 support])
if test "$GCC" = yes; then
AC_MSG_RESULT([-std=gnu11])
CC="$CC -std=gnu11"
else
AC_MSG_RESULT([assuming $CC supports C11 by default])
fi
gl_EARLY
AC_PROG_CPP
AC_PROG_SED