[lttng-ust.git] / m4 / rw_prog_cxx_works.m4

# rw_PROG_CXX_WORKS
#
# Check whether the C++ compiler works. There's a bit of oversight in
# autoconf that will set the C++ compiler to g++ if no compiler is found,
# even if g++ is not present! So we need an extra test to make sure that
# the compiler works.
#
AC_DEFUN([rw_PROG_CXX_WORKS], [
AC_REQUIRE([AC_PROG_CXX])
AC_CACHE_CHECK([whether the C++ compiler works],
	[rw_cv_prog_cxx_works],
	[AC_LANG_PUSH([C++])

	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
		check_cxx_designated_initializers=yes
	], [
		rw_cv_prog_cxx_works=no
	])

	AS_IF([test "x$check_cxx_designated_initializers" = "xyes"], [
		AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
			struct foo { int a; int b; };
			void fct(void)
			{
				struct foo f = { .a = 0, .b = 1 };
			}
		]])], [
			rw_cv_prog_cxx_works=yes
		], [
			rw_cv_prog_cxx_works=no
		])
	])

	AC_LANG_POP([C++])
])
])
Commit	Line	Data
94480b71 MJ	1	# rw_PROG_CXX_WORKS
	2	#
	3	# Check whether the C++ compiler works. There's a bit of oversight in
	4	# autoconf that will set the C++ compiler to g++ if no compiler is found,
	5	# even if g++ is not present! So we need an extra test to make sure that
	6	# the compiler works.
	7	#
	8	AC_DEFUN([rw_PROG_CXX_WORKS], [
	9	AC_REQUIRE([AC_PROG_CXX])
	10	AC_CACHE_CHECK([whether the C++ compiler works],
	11	[rw_cv_prog_cxx_works],
	12	[AC_LANG_PUSH([C++])
	13
	14	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
	15	check_cxx_designated_initializers=yes
	16	], [
	17	rw_cv_prog_cxx_works=no
	18	])
	19
	20	AS_IF([test "x$check_cxx_designated_initializers" = "xyes"], [
	21	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	22	struct foo { int a; int b; };
	23	void fct(void)
	24	{
	25	struct foo f = { .a = 0, .b = 1 };
	26	}
	27	]])], [
	28	rw_cv_prog_cxx_works=yes
	29	], [
	30	rw_cv_prog_cxx_works=no
	31	])
	32	])
	33
	34	AC_LANG_POP([C++])
	35	])
	36	])