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# 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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