[Bug fortran/46520] [4.6 Regression] libquadmath: fails at link test on bare irons

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46520

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.6 Regression]            |[4.6 Regression]
                   |libquadmath: Build also     |libquadmath: fails at link
                   |with --enable-languages=c;  |test on bare irons
                   |fails with some cross       |
                   |targets                     |

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> 2010-12-14 20:19:20 UTC ---
Current result for picochip-unknown-none:

checking how to run the C preprocessor... [...]
checking for sqrtl in -lm... configure: error: Link tests are not allowed after
GCC_NO_EXECUTABLES.
make[2]: *** [configure-target-libquadmath] Error 1

Draft patch - might be insufficient:

--- a/libquadmath/configure.ac
+++ b/libquadmath/configure.ac
@@ -109,8 +109,10 @@ esac
 AC_SUBST(toolexecdir)
 AC_SUBST(toolexeclibdir)

-AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes sqrtl])])
-AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes cbrtl])])
+if test x$gcc_no_link != xyes; then
+  AC_CHECK_LIB([m],[sqrtl],[AC_DEFINE([HAVE_SQRTL],[1],[libm includes
sqrtl])])
+  AC_CHECK_LIB([m],[cbrtl],[AC_DEFINE([HAVE_CBRTL],[1],[libm includes
cbrtl])])
+fi

 # Check for symbol versioning (copied from libssp).
 AC_MSG_CHECKING([whether symbol versioning is supported])