diff options
Diffstat (limited to 'm4/clang.m4')
| -rw-r--r-- | m4/clang.m4 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/m4/clang.m4 b/m4/clang.m4 new file mode 100644 index 0000000..0659d82 --- /dev/null +++ b/m4/clang.m4 @@ -0,0 +1,26 @@ +dnl Determine whether the current compiler is Clang. +dnl +dnl If the current compiler is Clang, set the shell variable CLANG to yes. +dnl +dnl The canonical version of this file is maintained in the rra-c-util +dnl package, available at <http://www.eyrie.org/~eagle/software/rra-c-util/>. +dnl +dnl Copyright 2015 Russ Allbery <eagle@eyrie.org> +dnl +dnl This file is free software; the authors give unlimited permission to copy +dnl and/or distribute it, with or without modifications, as long as this +dnl notice is preserved. + +dnl Source used by RRA_PROG_CC_CLANG. +AC_DEFUN([_RRA_PROG_CC_CLANG_SOURCE], [[ +#if ! __clang__ +#error +#endif +]]) + +AC_DEFUN([RRA_PROG_CC_CLANG], +[AC_CACHE_CHECK([if the compiler is Clang], [rra_cv_prog_cc_clang], + [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_RRA_PROG_CC_CLANG_SOURCE])], + [rra_cv_prog_cc_clang=yes], + [rra_cv_prog_cc_clang=no])]) + AS_IF([test x"$rra_cv_prog_cc_clang" = xyes], [CLANG=yes])]) |