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Improve TLS detection for systems with compiler support but no libc support.

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* acinclude.m4 (GUILE_THREAD_LOCAL_STORAGE): Use `AC_LINK_IFELSE'
  instead of `AC_COMPILE_IFELSE'.
This commit is contained in:
Ludovic Courtès 2009-10-15 23:52:00 +02:00
parent d94dcf59c6
commit 96e15df109
1 changed files with 5 additions and 2 deletions
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7
acinclude.m4
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@ -341,8 +341,11 @@ dnl Check for compiler thread-local storage (TLS) support.
AC_DEFUN([GUILE_THREAD_LOCAL_STORAGE], [
AC_CACHE_CHECK([whether the `__thread' storage class is available],
[ac_cv_have_thread_storage_class],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([__thread int tls_integer;],
[tls_integer = 123;])],
[dnl On some systems, e.g., NetBSD 5.0 with GCC 4.1, `__thread' is
dnl properly compiled but fails to link due to the lack of TLS
dnl support in the C library. Thus we try to link, not just compile.
AC_LINK_IFELSE([AC_LANG_PROGRAM([__thread int tls_integer;],
[tls_integer = 123;])],
[ac_cv_have_thread_storage_class="yes"],
[ac_cv_have_thread_storage_class="no"])])