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| author | Joseph Myers <joseph@codesourcery.com> | 2009-07-16 23:21:15 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2009-07-16 23:21:15 +0000 |
| commit | a0b0f93b04d2c7b1d3d1f591fcf7610cf1b2ed0c (patch) | |
| tree | 318c6101bfae8df71f36549407b2406c3b63fe93 /config/tls.m4 | |
| parent | afeb3d7fac9407747a42b0f90f3330ecb6f9754f (diff) | |
| download | binutils-a0b0f93b04d2c7b1d3d1f591fcf7610cf1b2ed0c.tar.gz binutils-a0b0f93b04d2c7b1d3d1f591fcf7610cf1b2ed0c.tar.bz2 binutils-a0b0f93b04d2c7b1d3d1f591fcf7610cf1b2ed0c.zip | |
* tls.m4 (GCC_CHECK_TLS): Also test TLS in a shared library when
cross-compiling.
Diffstat (limited to 'config/tls.m4')
| -rw-r--r-- | config/tls.m4 | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/config/tls.m4 b/config/tls.m4 index acb123f6986..4648a909880 100644 --- a/config/tls.m4 +++ b/config/tls.m4 @@ -1,5 +1,6 @@ dnl Check whether the target supports TLS. AC_DEFUN([GCC_CHECK_TLS], [ + AC_REQUIRE([AC_CANONICAL_HOST]) GCC_ENABLE(tls, yes, [], [Use thread-local storage]) AC_CACHE_CHECK([whether the target supports thread-local storage], gcc_cv_have_tls, [ @@ -66,7 +67,24 @@ AC_DEFUN([GCC_CHECK_TLS], [ [dnl This is the cross-compiling case. Assume libc supports TLS if the dnl binutils and the compiler do. AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }], - [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no]) + [chktls_save_LDFLAGS="$LDFLAGS" + dnl Shared library options may depend on the host; this check + dnl is only known to be needed for GNU/Linux. + case $host in + *-*-linux*) + LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS" + ;; + esac + chktls_save_CFLAGS="$CFLAGS" + CFLAGS="-fPIC $CFLAGS" + dnl If -shared works, test if TLS works in a shared library. + AC_LINK_IFELSE([int f() { return 0; }], + AC_LINK_IFELSE([__thread int a; int b; int f() { return a = b; }], + [gcc_cv_have_tls=yes], + [gcc_cv_have_tls=no]), + [gcc_cv_have_tls=yes]) + CFLAGS="$chktls_save_CFLAGS" + LDFLAGS="$chktls_save_LDFLAGS"], [gcc_cv_have_tls=no]) ] )]) if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then |