kc3-lang/libbsd/m4/libbsd-compiler.m4

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• Hash : b7367c9c
  Author :
  Date : 2023-09-05T03:02:44
  

  build: Add missing dash to macro title bar
  

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• m4/libbsd-compiler.m4

• # Copyright © 2021 Guillem Jover <guillem@hadrons.org>
  
  # LIBBSD_CHECK_COMPILER_FLAG
  # --------------------------
  AC_DEFUN([LIBBSD_CHECK_COMPILER_FLAG], [
    AS_VAR_PUSHDEF([libbsd_varname_cache], [libbsd_cv_cflags_$1])
    AC_CACHE_CHECK([whether $CC accepts $1], [libbsd_varname_cache], [
      m4_define([libbsd_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W]))
      AS_VAR_COPY([libbsd_save_CFLAGS], [CFLAGS])
      AS_VAR_SET([CFLAGS], ["-Werror libbsd_check_flag"])
      AC_COMPILE_IFELSE([
        AC_LANG_SOURCE([[]])
      ], [
        AS_VAR_SET([libbsd_varname_cache], [yes])
      ], [
        AS_VAR_SET([libbsd_varname_cache], [no])
      ])
      AS_VAR_COPY([CFLAGS], [libbsd_save_CFLAGS])
    ])
    AS_VAR_IF([libbsd_varname_cache], [yes], [
      AS_VAR_APPEND([LIBBSD_COMPILER_FLAGS], [" $1"])
    ])
    AS_VAR_POPDEF([libbsd_varname_cache])
  ])
  
  # LIBBSD_HAS_GNU_INIT_ARRAY
  # -------------------------
  AC_DEFUN([LIBBSD_HAS_GNU_INIT_ARRAY], [
    AC_CACHE_CHECK([for GNU .init_array section support],
      [libbsd_cv_gnu_init_array_support], [
      AC_RUN_IFELSE([
        AC_LANG_SOURCE([[
  static int rc = 1;
  static void init(int argc) { if (argc == 1) rc = 0; }
  void (*init_func)(int argc) __attribute__((__section__(".init_array"), __used__)) = init;
  int main() { return rc; }
        ]])
      ], [
        libbsd_cv_gnu_init_array_support=yes
      ], [
        libbsd_cv_gnu_init_array_support=no
      ], [
        AC_PREPROC_IFELSE([
          AC_LANG_SOURCE([[
  /* Look for a known libc that supports .init_array with the GNU extension
   * to pass main() arguments to the init functions. */
  #include <stdlib.h>
  #if defined __GLIBC_PREREQ
  #  if __GLIBC_PREREQ(2, 4)
  /* glibc supports GNU .init_array since 2.4. */
  #  else
  #    error glibc does not support GNU .init_array
  #  endif
  #else
  /*
   * Basic SysV ABI .init_array support, init functions do not get arguments:
   * - Bionic since its inception.
   * - uClibc since 0.9.29.
   */
  #  error unknown whether libc supports GNU .init_array
  #endif
          ]])
        ], [
          libbsd_cv_gnu_init_array_support=yes
        ], [
          libbsd_cv_gnu_init_array_support=no
        ])
      ])
    ])
    AM_CONDITIONAL([BUILD_LIBBSD_CTOR],
      [test "$libbsd_cv_gnu_init_array_support" = yes])
  ])
  

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