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Diffstat (limited to 'm4/ax_c_statement_expressions.m4')
| -rw-r--r-- | m4/ax_c_statement_expressions.m4 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/m4/ax_c_statement_expressions.m4 b/m4/ax_c_statement_expressions.m4 new file mode 100644 index 000000000..fb259e727 --- /dev/null +++ b/m4/ax_c_statement_expressions.m4 @@ -0,0 +1,23 @@ +# AC_C_STMT_EXPR +# ------------- +# Define HAVE_STMT_EXPR if compiler has statement expressions. +AN_IDENTIFIER([_Generic], [AC_C_STMT_EXPR]) +AC_DEFUN([AC_C_STMT_EXPR], +[AC_CACHE_CHECK([for statement expressions], ac_cv_c_stmt_expr, +[AC_COMPILE_IFELSE( + [AC_LANG_SOURCE( + [[int + main (int argc, char **argv) + { + int x = ({ int y = 1; y; }); + return x; + } + ]])], + [ac_cv_c_stmt_expr=yes], + [ac_cv_c_stmt_expr=no])]) +if test $ac_cv_c_stmt_expr = yes; then + AC_DEFINE([HAVE_STMT_EXPR], 1, + [Define to 1 if compiler supports statement expressions.]) +fi +])# AC_C_STMT_EXPR + |