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| author | Ludovic Courtès <ludo@gnu.org> | 2009-10-15 23:52:00 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2009-10-15 23:52:00 +0200 |
| commit | 96e15df109ccfdcc2f6b2cffc0b64a083f000903 (patch) | |
| tree | 1f5a87a5156b2698d1d46d1a650309685f54bdee /acinclude.m4 | |
| parent | d94dcf59c684c3cf52c148ebd3867b0e98b6faa0 (diff) | |
| download | guile-96e15df109ccfdcc2f6b2cffc0b64a083f000903.tar.gz | |
Improve TLS detection for systems with compiler support but no libc support.release_1-9-4
* acinclude.m4 (GUILE_THREAD_LOCAL_STORAGE): Use `AC_LINK_IFELSE'
instead of `AC_COMPILE_IFELSE'.
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/acinclude.m4 b/acinclude.m4 index ed537d0bd..43a227bc9 100644 --- a/acinclude.m4 +++ b/acinclude.m4 @@ -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"])]) |