diff options
| -rw-r--r-- | configure.ac | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index 24353f63..d7d58e1a 100644 --- a/configure.ac +++ b/configure.ac @@ -75,12 +75,19 @@ AS_IF([test "x$ac_cv_c99" != xyes], AC_MSG_ERROR([gcc with C99 support required])) AC_CACHE_CHECK([for __thread support], ac_cv_tls, [dnl +# Use the same flags that we use for our DSOs, so the test is representative. +# Some old compiler/linker/libc combinations fail some ways and not others. +save_CFLAGS="$CFLAGS" +save_LDFLAGS="$LDFLAGS" +CFLAGS="-fpic $CFLAGS" +LDFLAGS="-shared -Wl,-z,defs,-z,relro $LDFLAGS" AC_LINK_IFELSE([dnl AC_LANG_PROGRAM([[#undef __thread -static __thread int a __attribute__ ((tls_model ("local-dynamic"))); -int foo (int b) { return a + b; }]], +static __thread int a; int foo (int b) { return a + b; }]], [[exit (foo (0));]])], - ac_cv_tls=yes, ac_cv_tls=no)]) + ac_cv_tls=yes, ac_cv_tls=no) +CFLAGS="$save_CFLAGS" +LDFLAGS="$save_LDFLAGS"]) AS_IF([test "x$ac_cv_tls" != xyes], AC_MSG_ERROR([__thread support required])) |