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-rw-r--r--libgcc-math/configure.ac22
1 files changed, 22 insertions, 0 deletions
diff --git a/libgcc-math/configure.ac b/libgcc-math/configure.ac
index 3928552..7fa9e72 100644
--- a/libgcc-math/configure.ac
+++ b/libgcc-math/configure.ac
@@ -124,6 +124,25 @@ else
fi
+# Check for target library dependencies
+cannot_build=no
+
+AC_MSG_CHECKING([whether math.h conflicts with defining __isinf])
+AC_TRY_LINK([
+#include "math.h"
+int __isinf (double x)
+{
+}
+], [
+return __isinf (1.0);
+], [
+AC_MSG_RESULT([no])
+], [
+AC_MSG_RESULT([yes])
+cannot_build=yes
+])
+
+
# Now check which parts we include in the library.
arch_subdirs=
@@ -141,6 +160,9 @@ esac
AC_SUBST(arch_subdirs)
AC_SUBST(arch_libraries)
AC_SUBST(arch_maps)
+if test "$cannot_build" = "yes"; then
+ arch_subdirs=
+fi
AM_CONDITIONAL(BUILD_LIBGCC_MATH, [test "x$arch_subdirs" != x])