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Enable visibility hiding by default 

Makes next to no difference in sizes.
Let's just do it anyway.
This commit is contained in:
Kim Woelders 2019-03-12 16:53:14 +01:00
parent 2e970c84f8
commit 0d88c6d795
4 changed files with 72 additions and 2 deletions
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2
api/Makefile.am
View File

@ -7,7 +7,7 @@ if BUILD_GLX
EPPLET_LIB_GLX = libepplet_glx.la
endif
AM_CPPFLAGS = -I$(top_builddir) $(CWARNFLAGS)
AM_CPPFLAGS = -I$(top_builddir) $(CWARNFLAGS) $(CFLAGS_VISIBILITY)
lib_LTLIBRARIES = libepplet.la $(EPPLET_LIB_GLX)

1
configure.ac
View File

@ -45,6 +45,7 @@ AC_C_CONST
AC_C_INLINE
EC_C___ATTRIBUTE__
EC_C___FUNC__
EC_C_VISIBILITY(yes)
AC_PATH_XTRA

2
epplets/Makefile.am
View File

@ -15,7 +15,7 @@ EXTRA_PROGRAMS = EppletTest.epplet EppletConfigTest.epplet E-Mixer.epplet \
Emix.epplet E-PlayCD.epplet E-OpenGL-Demo.epplet \
E-SD.epplet
AM_CPPFLAGS = -I$(top_builddir) -I$(top_builddir)/api $(IMLIB2_CFLAGS) $(X_CFLAGS) $(LIBGTOP_CFLAGS) $(CWARNFLAGS)
AM_CPPFLAGS = -I$(top_builddir) -I$(top_builddir)/api $(IMLIB2_CFLAGS) $(X_CFLAGS) $(LIBGTOP_CFLAGS) $(CWARNFLAGS) $(CFLAGS_VISIBILITY)
LDADD = $(top_builddir)/api/libepplet.la $(X_LIBS) $(KSTAT_LIBS)
################ Conditional Builds ################

69
m4/ec_visibility.m4 Normal file
View File

@ -0,0 +1,69 @@
# visibility.m4 serial 1 (gettext-0.15)
dnl Copyright (C) 2005 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Bruno Haible.
dnl Tests whether the compiler supports the command-line option
dnl -fvisibility=hidden and the function and variable attributes
dnl __attribute__((__visibility__("hidden"))) and
dnl __attribute__((__visibility__("default"))).
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 MacOS X.
dnl Does *not* test for __visibility__("internal") - which has processor
dnl dependent semantics.
dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
dnl "really only recommended for legacy code".
dnl Set the variable CFLAGS_VISIBILITY.
dnl Defines and sets the variable HAVE_VISIBILITY.
dnl Modified for E stuff by Kim Woelders
AC_DEFUN([EC_C_VISIBILITY],
[
AC_REQUIRE([AC_PROG_CC])
define(ec_c_vis_default, ifelse([$1], [no], [no], [yes]))
CFLAGS_VISIBILITY=
HAVE_VISIBILITY=0
AC_ARG_ENABLE([visibility-hiding],
[AS_HELP_STRING([--enable-visibility-hiding],
[enable visibility hiding @<:@default=]ec_c_vis_default[@:>@])],,
[enable_visibility_hiding=]ec_c_vis_default)
if test -n "$GCC" -a "x$enable_visibility_hiding" = "xyes"; then
AC_MSG_CHECKING([for simple visibility declarations])
AC_CACHE_VAL(ec_cv_cc_visibility, [
ec_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden"
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
]], [[
extern __attribute__((__visibility__("hidden"))) int hiddenvar;
extern __attribute__((__visibility__("default"))) int exportedvar;
extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
extern __attribute__((__visibility__("default"))) int exportedfunc (void);
]])
],
ec_cv_cc_visibility=yes,
ec_cv_cc_visibility=no)
CFLAGS="$ec_save_CFLAGS"])
AC_MSG_RESULT([$ec_cv_cc_visibility])
if test $ec_cv_cc_visibility = yes; then
CFLAGS_VISIBILITY="-fvisibility=hidden"
HAVE_VISIBILITY=1
AC_DEFINE(__EXPORT__, __attribute__((__visibility__("default"))), [Symbol is exported])
fi
else
enable_visibility_hiding=no
fi
AC_SUBST([CFLAGS_VISIBILITY])
AC_SUBST([HAVE_VISIBILITY])
AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
[Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
])