| # bison-check-compile-flag.m4 |
| |
| # serial 1 |
| |
| # Copyright (C) 2018 Free Software Foundation, # Inc. |
| |
| # This file is free software; the Free Software Foundation |
| # gives unlimited permission to copy and/or distribute it, |
| # with or without modifications, as long as this notice is preserved. |
| |
| |
| |
| # BISON_CHECK_COMPILER_FLAG(FLAG, |
| # [ACTION-SUCCESS], [ACTION-FAILURE], |
| # [EXTRA-FLAGS]) |
| # ------------------------------------------------------------- |
| |
| # Based on Autoconf Macro Archive's AX_CHECK_COMPILE_FLAG, but using |
| # AC_LINK_IFELSE, not just AC_COMPILE_IFELSE to capture failures such |
| # as: |
| # |
| # ./c++.at:401: $PREPARSER ./list |
| # stderr: |
| # ./list: error while loading shared libraries: libc++.so.1: cannot open shared object file: No such file or directory |
| # |
| # because we thought '-stdlib=c++' works, as it passes with AC_COMPILE_IFELSE. |
| # |
| # Not using AX_CHECK_LINK_FLAG, because its message is inappropriate: |
| # |
| # checking whether the linker accepts -std=c++11... yes |
| # checking whether the linker accepts -std=c++14... yes |
| # checking whether the linker accepts -std=c++17... no |
| AC_DEFUN([BISON_CHECK_COMPILER_FLAG], |
| [AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX |
| AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl |
| AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ |
| ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS |
| _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" |
| AC_LINK_IFELSE([m4_default([$5], [AC_LANG_PROGRAM()])], |
| [AS_VAR_SET(CACHEVAR,[yes])], |
| [AS_VAR_SET(CACHEVAR,[no])]) |
| _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) |
| AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], [$2], [$3]) |
| AS_VAR_POPDEF([CACHEVAR])dnl |
| ])dnl BISON_CHECK_COMPILER_FLAGS |