trunk/m4/pragma_diagnostics.m4

dnl Christian Schoenebeck  2016-10-31
dnl --------------------------------------------------------------------------
dnl
dnl Synopsis:
dnl
dnl    ACX_CXX_PRAGMA_DIAGNOSTICS
dnl
dnl Check the compiler for supported pragma diagnostics capablities.
dnl It takes no arguments.
dnl
dnl At the moment this configure check only checks whether the compiler
dnl supports embedding pragma diagnostic statements between parts of
dnl statements.
dnl
dnl --------------------------------------------------------------------------
AC_DEFUN([ACX_CXX_PRAGMA_DIAGNOSTICS],
[

  AC_MSG_CHECKING(for compiler's pragma diagnostics)

  AC_LANG_PUSH([C++])

  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[

#include <stdlib.h>

int foo(int a, int b) {
    int i =
        _Pragma("GCC diagnostic push")
        _Pragma("GCC diagnostic ignored \"-Winvalid-offsetof\"")
        (a + b)
        _Pragma("GCC diagnostic pop")
        ;
    return i;
}

  ]])],[
    AC_MSG_RESULT(yes)
    have_embedded_pragma_diag=1
  ], [
    AC_MSG_RESULT(no)
    have_embedded_pragma_diag=0
  ])
  AC_DEFINE_UNQUOTED(HAVE_CXX_EMBEDDED_PRAGMA_DIAGNOSTICS,$have_embedded_pragma_diag,[Define to 1 if your compiler supports embedded pragma diagnostics.])

  AC_LANG_POP([C++])
])
1	schoenebeck	3035	dnl Christian Schoenebeck 2016-10-31
2			dnl --------------------------------------------------------------------------
3			dnl
4			dnl Synopsis:
5			dnl
6			dnl ACX_CXX_PRAGMA_DIAGNOSTICS
7			dnl
8			dnl Check the compiler for supported pragma diagnostics capablities.
9			dnl It takes no arguments.
10			dnl
11			dnl At the moment this configure check only checks whether the compiler
12			dnl supports embedding pragma diagnostic statements between parts of
13			dnl statements.
14			dnl
15			dnl --------------------------------------------------------------------------
16			AC_DEFUN([ACX_CXX_PRAGMA_DIAGNOSTICS],
17			[
18
19			AC_MSG_CHECKING(for compiler's pragma diagnostics)
20
21			AC_LANG_PUSH([C++])
22
23			AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
24
25			#include <stdlib.h>
26
27			int foo(int a, int b) {
28			int i =
29			_Pragma("GCC diagnostic push")
30			_Pragma("GCC diagnostic ignored \"-Winvalid-offsetof\"")
31			(a + b)
32			_Pragma("GCC diagnostic pop")
33			;
34			return i;
35			}
36
37			]])],[
38			AC_MSG_RESULT(yes)
39			have_embedded_pragma_diag=1
40			], [
41			AC_MSG_RESULT(no)
42			have_embedded_pragma_diag=0
43			])
44			AC_DEFINE_UNQUOTED(HAVE_CXX_EMBEDDED_PRAGMA_DIAGNOSTICS,$have_embedded_pragma_diag,[Define to 1 if your compiler supports embedded pragma diagnostics.])
45
46			AC_LANG_POP([C++])
47			])