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build: fix configure check for CC support of _Generic() and __auto_type

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autotools' AC_LANG_PROGRAM() generates a main() function which triggers
a compiler warning (for which we fail with -WError).

    conftest.c:92:1: error: function declaration isn't a prototype [-Werror=strict-prototypes]
     main ()
     ^~~~
    cc1: all warnings being treated as errors

Fixes: 557d83bf2d
This commit is contained in:
Thomas Haller 2018-01-28 08:51:25 +01:00
parent 8ad310f8e3
commit a43bf33888
1 changed files with 4 additions and 4 deletions
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8
configure.ac
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@ -1173,16 +1173,16 @@ fi
AC_SUBST(SANITIZERS, [$sanitizers])
AC_MSG_CHECKING([CC support C11 _Generic()])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[int foo(void); int foo() { int a = 0; int b = _Generic (a, int: 4); return b + a; }]],
[[foo();]])],
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int foo(void); int foo() { int a = 0; int b = _Generic (a, int: 4); return b + a; }]],
[[foo();]])],
[cc_support_generic=1],
[cc_support_generic=0])
AC_MSG_RESULT($cc_support_generic)
AC_DEFINE_UNQUOTED(_NM_CC_SUPPORT_GENERIC, $cc_support_generic, [Define whether the compiler supports C11 _Generic()])
AC_MSG_CHECKING([CC support gcc __auto_type])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[int foo(void); int foo() { int a = 0; __auto_type b = a; return b + a; }]],
[[foo();]])],
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int foo(void); int foo() { int a = 0; __auto_type b = a; return b + a; }]],
[[foo();]])],
[cc_support_auto_type=1],
[cc_support_auto_type=0])
AC_MSG_RESULT($cc_support_auto_type)