If subdir-objects is made the default Automake behaviour, packages
will need to add AM_PROG_CC_C_O to their configure.ac. Instead of
that, let's just make the functionality provided by AM_PROG_CC_C_O
mandatory for C projects, and have Automake automatically call it
as required.
This change should have no effect on packages which explicitly call
AM_PROG_CC_C_O already.
* m4/init.m4: Have AM_INIT_AUTOMAKE arrange for AM_PROG_CC_C_O to be
called if necessary.
---
m4/init.m4 | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/m4/init.m4 b/m4/init.m4
index 7535706..6c48704 100644
--- a/m4/init.m4
+++ b/m4/init.m4
@@ -109,6 +109,11 @@ AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
[m4_define([AC_PROG_OBJCXX],
m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
])
+dnl Automatically invoke AM_PROG_CC_C_O as necessary. Since AC_PROG_CC is
+dnl usually called after AM_INIT_AUTOMAKE, we arrange for the test to be
+dnl done later by AC_CONFIG_COMMANDS_PRE.
+AC_CONFIG_COMMANDS_PRE([AC_PROVIDE_IFELSE([AC_PROG_CC],
+ [AC_LANG([C]) AM_PROG_CC_C_O])])dnl
AC_REQUIRE([AM_SILENT_RULES])dnl
dnl The testsuite driver may need to know about EXEEXT, so add the
dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen. This
--
1.8.1
