[lttng-tools.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.
# Script copied from the lttng-ust project.
#
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
a9c2df2b FD	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	# Script copied from the lttng-ust project.
	8	#
	9	AC_DEFUN([rw_PROG_CXX_WORKS], [
	10	AC_REQUIRE([AC_PROG_CXX])
	11	AC_CACHE_CHECK([whether the C++ compiler works],
	12	[rw_cv_prog_cxx_works],
	13	[AC_LANG_PUSH([C++])
	14
	15	AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [
	16	check_cxx_designated_initializers=yes
	17	], [
	18	rw_cv_prog_cxx_works=no
	19	])
	20
	21	AS_IF([test "x$check_cxx_designated_initializers" = "xyes"], [
	22	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
	23	struct foo { int a; int b; };
	24	void fct(void)
	25	{
	26	struct foo f = { .a = 0, .b = 1 };
	27	}
	28	]])], [
	29	rw_cv_prog_cxx_works=yes
	30	], [
	31	rw_cv_prog_cxx_works=no
	32	])
	33	])
	34
	35	AC_LANG_POP([C++])
	36	])
	37	])