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

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• Hash : 31e9396b
  Author :
  Date : 2024-03-13T00:56:07
  

  build: Only install time struct conversion macros where missing These macros are available in several systems, and we should not install the man pages for them, otherwise we might end up shadowing the system man pages if present.

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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])
  ])
  
  # LIBBSD_SELECT_API(name, desc)
  # -----------------
  AC_DEFUN([LIBBSD_SELECT_API], [
    AS_IF([test -z "$AS_TR_SH([api_$1])"], [
      AC_MSG_ERROR([missing API selection for $1])
    ], [test "$AS_TR_SH([api_$1])" = "unknown"], [
      AC_MSG_ERROR([unknown ABI selection for $1])
    ], [test "$AS_TR_SH([api_$1])" = "yes"], [
      AC_DEFINE(AS_TR_CPP([LIBBSD_API_$1]), [1], [Provide API for $2])
    ], [
      AC_DEFINE(AS_TR_CPP([LIBBSD_API_$1]), [0])
    ])
    AM_CONDITIONAL(AS_TR_CPP([API_$1]),
      [test "x$AS_TR_SH([api_$1])" = "xyes"])
  ])
  
  # LIBBSD_SELECT_ABI(name, desc)
  # -----------------
  AC_DEFUN([LIBBSD_SELECT_ABI], [
    AS_IF([test -z "$AS_TR_SH([abi_$1])"], [
      AC_MSG_ERROR([missing ABI selection for $1])
    ], [test "$AS_TR_SH([abi_$1])" = "unknown"], [
      AC_MSG_ERROR([unknown ABI selection for $1])
    ], [test "$AS_TR_SH([abi_$1])" = "yes"], [
      AC_DEFINE(AS_TR_CPP([LIBBSD_ABI_$1]), [1], [Provide ABI for $2])
    ], [
      AC_DEFINE(AS_TR_CPP([LIBBSD_ABI_$1]), [0])
    ])
    AM_CONDITIONAL(AS_TR_CPP([ABI_$1]),
      [test "x$AS_TR_SH([abi_$1])" = "xyes"])
  ])
  

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