Add macro for detecting the output filename for gcc -MD...

[apt.git] / buildlib / tools.m4

diff --git a/buildlib/tools.m4 b/buildlib/tools.m4
index cb57bb34fdbd0c74944b34754cc4a8675bf12514..9ad0bd05a1d4df8be09a4a1f3f709e2d554ba702 100644 (file)
--- a/buildlib/tools.m4
+++ b/buildlib/tools.m4
@@ -135,3 +135,23 @@ _LIBSTDCPP_
        fi
        AC_SUBST(LIBSTDCPP_VER)
 ])
+
+AC_DEFUN(ah_GCC3DEP,[
+       AC_MSG_CHECKING(if $CXX -MD works)
+       touch gcc3dep.cc
+       ${CXX-c++} -MD -o gcc3dep_test.o -c gcc3dep.cc
+       rm -f gcc3dep.cc gcc3dep_test.o
+       if test -e gcc3dep.d; then
+               rm -f gcc3dep.d
+               GCC_MD=input
+               GCC3DEP=no
+       elif test -e gcc3dep_test.d; then
+               rm -f gcc3dep_test.d
+               GCC_MD=output
+               GCC3DEP=yes
+       else
+               AC_MSG_ERROR(no)
+       fi
+       AC_MSG_RESULT([yes, for $GCC_MD])
+       AC_SUBST(GCC3DEP)
+])