c3-lang/libmd/m4/libmd-compiler.m4

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• Hash : e35f6b87
  Author :
  Date : 2021-02-19T23:59:47
  

  build: Add compiler warnings support Detect as many warnings as possible during configure and enable them if the user did not supply any, so that any such problem can be spotted and fixed.

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• m4/libmd-compiler.m4

• # Copyright © 2021 Guillem Jover <guillem@hadrons.org>
  
  # LIBMD_CHECK_COMPILER_FLAG
  # -------------------------
  AC_DEFUN([LIBMD_CHECK_COMPILER_FLAG], [
    AS_VAR_PUSHDEF([libmd_varname_cache], [libmd_cv_cflags_$1])
    AC_CACHE_CHECK([whether $CC accepts $1], [libmd_varname_cache], [
      m4_define([libmd_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W]))
      AS_VAR_COPY([libmd_save_CFLAGS], [CFLAGS])
      AS_VAR_SET([CFLAGS], ["-Werror libmd_check_flag"])
      AC_COMPILE_IFELSE([
        AC_LANG_SOURCE([[]])
      ], [
        AS_VAR_SET([libmd_varname_cache], [yes])
      ], [
        AS_VAR_SET([libmd_varname_cache], [no])
      ])
      AS_VAR_COPY([CFLAGS], [libmd_save_CFLAGS])
    ])
    AS_VAR_IF([libmd_varname_cache], [yes], [
      AS_VAR_APPEND([LIBMD_COMPILER_FLAGS], [" $1"])
    ])
    AS_VAR_POPDEF([libmd_varname_cache])
  ])
  

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