"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "m4/visibility.m4" between
libextractor-1.8.tar.gz and libextractor-1.9.tar.gz

About: GNU libextractor is a library used to extract meta-data from files of arbitrary type.

visibility.m4  (libextractor-1.8):visibility.m4  (libextractor-1.9)
# visibility.m4 serial 1 (gettext-0.15) # visibility.m4 serial 5 (gettext-0.18.2)
dnl Copyright (C) 2005 Free Software Foundation, Inc. dnl Copyright (C) 2005, 2008, 2010-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it, dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved. dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible. dnl From Bruno Haible.
dnl Tests whether the compiler supports the command-line option dnl Tests whether the compiler supports the command-line option
dnl -fvisibility=hidden and the function and variable attributes dnl -fvisibility=hidden and the function and variable attributes
dnl __attribute__((__visibility__("hidden"))) and dnl __attribute__((__visibility__("hidden"))) and
dnl __attribute__((__visibility__("default"))). dnl __attribute__((__visibility__("default"))).
dnl Does *not* test for __visibility__("protected") - which has tricky dnl Does *not* test for __visibility__("protected") - which has tricky
dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on
dnl MacOS X. dnl Mac OS X.
dnl Does *not* test for __visibility__("internal") - which has processor dnl Does *not* test for __visibility__("internal") - which has processor
dnl dependent semantics. dnl dependent semantics.
dnl Does *not* test for #pragma GCC visibility push(hidden) - which is dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
dnl "really only recommended for legacy code". dnl "really only recommended for legacy code".
dnl Set the variable CFLAG_VISIBILITY. dnl Set the variable CFLAG_VISIBILITY.
dnl Defines and sets the variable HAVE_VISIBILITY. dnl Defines and sets the variable HAVE_VISIBILITY.
AC_DEFUN([gl_VISIBILITY], AC_DEFUN([gl_VISIBILITY],
[ [
AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_PROG_CC])
CFLAG_VISIBILITY= CFLAG_VISIBILITY=
HAVE_VISIBILITY=0 HAVE_VISIBILITY=0
if test -n "$GCC"; then if test -n "$GCC"; then
dnl First, check whether -Werror can be added to the command line, or
dnl whether it leads to an error because of some other option that the
dnl user has put into $CC $CFLAGS $CPPFLAGS.
AC_MSG_CHECKING([whether the -Werror option is usable])
AC_CACHE_VAL([gl_cv_cc_vis_werror], [
gl_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[]], [[]])],
[gl_cv_cc_vis_werror=yes],
[gl_cv_cc_vis_werror=no])
CFLAGS="$gl_save_CFLAGS"])
AC_MSG_RESULT([$gl_cv_cc_vis_werror])
dnl Now check whether visibility declarations are supported.
AC_MSG_CHECKING([for simple visibility declarations]) AC_MSG_CHECKING([for simple visibility declarations])
AC_CACHE_VAL(gl_cv_cc_visibility, [ AC_CACHE_VAL([gl_cv_cc_visibility], [
gl_save_CFLAGS="$CFLAGS" gl_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden" CFLAGS="$CFLAGS -fvisibility=hidden"
AC_TRY_COMPILE( dnl We use the option -Werror and a function dummyfunc, because on some
[extern __attribute__((__visibility__("hidden"))) int hiddenvar; dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
extern __attribute__((__visibility__("default"))) int exportedvar; dnl "visibility attribute not supported in this configuration; ignored"
extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); dnl at the first function definition in every compilation unit, and we
extern __attribute__((__visibility__("default"))) int exportedfunc (voi dnl don't want to use the option in this case.
d);], if test $gl_cv_cc_vis_werror = yes; then
[], CFLAGS="$CFLAGS -Werror"
gl_cv_cc_visibility=yes, fi
gl_cv_cc_visibility=no) AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[extern __attribute__((__visibility__("hidden"))) int hiddenvar;
extern __attribute__((__visibility__("default"))) int exportedvar;
extern __attribute__((__visibility__("hidden"))) int hiddenfunc (vo
id);
extern __attribute__((__visibility__("default"))) int exportedfunc
(void);
void dummyfunc (void) {}
]],
[[]])],
[gl_cv_cc_visibility=yes],
[gl_cv_cc_visibility=no])
CFLAGS="$gl_save_CFLAGS"]) CFLAGS="$gl_save_CFLAGS"])
AC_MSG_RESULT([$gl_cv_cc_visibility]) AC_MSG_RESULT([$gl_cv_cc_visibility])
if test $gl_cv_cc_visibility = yes; then if test $gl_cv_cc_visibility = yes; then
CFLAG_VISIBILITY="-fvisibility=hidden" CFLAG_VISIBILITY="-fvisibility=hidden"
HAVE_VISIBILITY=1 HAVE_VISIBILITY=1
fi fi
fi fi
AC_SUBST([CFLAG_VISIBILITY]) AC_SUBST([CFLAG_VISIBILITY])
AC_SUBST([HAVE_VISIBILITY]) AC_SUBST([HAVE_VISIBILITY])
AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY], AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
 End of changes. 5 change blocks. 
13 lines changed or deleted 39 lines changed or added

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