Ecore: add a new macro to check if compiler flags are available

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/ecore@71857 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

diff --git a/m4/efl_compiler.m4 b/m4/efl_compiler.m4
new file mode 100644 (file)
index 0000000..86ce806
--- /dev/null
+++ b/m4/efl_compiler.m4
@@ -0,0 +1,51 @@
+dnl Copyright (C) 2012 Vincent Torri <vincent dot torri at gmail dot com>
+dnl This code is public domain and can be freely used or copied.
+
+dnl Macro that check if compiler of linker flags are available
+
+
+dnl Macro that checks for a compiler flag availability
+dnl
+dnl EFL_CHECK_COMPILER_FLAG(EFL, FLAG[, ACTION-IF-FOUND[ ,ACTION-IF-NOT-FOUND]])
+dnl AC_SUBST : EFL_CFLAGS (EFL being replaced by its value)
+dnl AM_CONDITIONAL : EFL_HAVE_FLAG (FLAG being replaced by its value)
+
+AC_DEFUN([EFL_CHECK_COMPILER_FLAG],
+[
+m4_pushdef([UPEFL], m4_translit([$1], [-a-z], [_A-Z]))dnl
+m4_pushdef([UP], m4_translit([$2], [-a-z], [_A-Z]))dnl
+
+CFLAGS_save="${CFLAGS}"
+CFLAGS="${CFLAGS} $2"
+
+AC_LANG_PUSH([C])
+AC_MSG_CHECKING([whether the compiler supports $2])
+
+AC_COMPILE_IFELSE(
+   [AC_LANG_PROGRAM([[]])],
+   [have_flag="yes"],
+   [have_flag="no"])
+AC_MSG_RESULT([${have_flag}])
+
+CFLAGS="${CFLAGS_save}"
+AC_LANG_POP([C])
+
+UPEFL[_CFLAGS]="${UPEFL[_CFLAGS]} [$2]"
+AC_ARG_VAR(UPEFL[_CFLAGS], [preprocessor flags for $2])
+AC_SUBST(UPFEL[_CFLAGS])
+
+AM_CONDITIONAL([EFL_HAVE]UP, [test "x${have_flag}" = "xyes"])
+
+m4_popdef([UP])
+m4_popdef([UPEFL])
+])
+
+dnl Macro that iterates over a sequence of white separated flags
+dnl and that call EFL_CHECK_COMPILER_FLAG() for each of these flags
+dnl
+dnl EFL_CHECK_COMPILER_FLAGS(EFL, FLAGS)
+
+AC_DEFUN([EFL_CHECK_COMPILER_FLAGS],
+[
+m4_foreach_w([flag], [$2], [EFL_CHECK_COMPILER_FLAG($1, m4_defn([flag]))])
+])
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