From 3484a99ba1ecddd221c9c77b321d66edb456a7fc Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Thu, 19 Jan 2006 08:31:08 +0000
Subject: [PATCH] Make sure that libm is used during config tests so that ceil,
 floor, and friends are actually detected.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25454 91177308-0d34-0410-b5e6-96231b3b80d8
---
 autoconf/configure.ac           |  2 +-
 configure                       | 73 +++++++++++++++++++++++++++++++++
 include/llvm/Config/config.h.in |  3 ++
 3 files changed, 77 insertions(+), 1 deletion(-)

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 1ccef0ad97b..2573f7ee2d9 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -450,7 +450,7 @@ dnl===-----------------------------------------------------------------------===
 
 dnl libelf is for sparc only; we can ignore it if we don't have it
 AC_CHECK_LIB(elf, elf_begin)
-
+AC_CHECK_LIB(m,sin)
 
 dnl lt_dlopen may be required for plugin support.
 AC_SEARCH_LIBS(lt_dlopen,ltdl,AC_DEFINE([HAVE_LT_DLOPEN],[1],
diff --git a/configure b/configure
index 9daf472f1b8..05d9b125a09 100755
--- a/configure
+++ b/configure
@@ -24981,6 +24981,79 @@ _ACEOF
 fi
 
 
+echo "$as_me:$LINENO: checking for sin in -lm" >&5
+echo $ECHO_N "checking for sin in -lm... $ECHO_C" >&6
+if test "${ac_cv_lib_m_sin+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lm  $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+/* Override any gcc2 internal prototype to avoid an error.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+   builtin and then its argument prototype would still apply.  */
+char sin ();
+int
+main ()
+{
+sin ();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_lib_m_sin=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_lib_m_sin=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_m_sin" >&5
+echo "${ECHO_T}$ac_cv_lib_m_sin" >&6
+if test $ac_cv_lib_m_sin = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBM 1
+_ACEOF
+
+  LIBS="-lm $LIBS"
+
+fi
+
 
 echo "$as_me:$LINENO: checking for library containing lt_dlopen" >&5
 echo $ECHO_N "checking for library containing lt_dlopen... $ECHO_C" >&6
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index 2166163f488..92cdaaa1f75 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -172,6 +172,9 @@
 /* Define to 1 if you have the `elf' library (-lelf). */
 #undef HAVE_LIBELF
 
+/* Define to 1 if you have the `m' library (-lm). */
+#undef HAVE_LIBM
+
 /* Define to 1 if you have the `pthread' library (-lpthread). */
 #undef HAVE_LIBPTHREAD
 
-- 
2.34.1