[pclasses-cvs] pclasses2/m4 gcc_visibility.m4,NONE,1.1

[Christian P. <cp...@us...>]

Update of /cvsroot/pclasses/pclasses2/m4
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv32184/m4

Added Files:
	gcc_visibility.m4 
Log Message:
Added gcc visibility patch support.


--- NEW FILE: gcc_visibility.m4 ---
dnl
dnl Check for gcc visibility support (gcc 4.0 or higher, or gcc 3.x
dnl with backported visibility patch)
dnl
dnl (C) 2004 Bernhard Rosenkraenzer <be...@ar...>
dnl

AC_DEFUN([PC_CHECK_CXX_VISIBILITY],
[AC_MSG_CHECKING([for gcc visibility support])
save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -fvisibility=hidden"
AC_COMPILE_IFELSE([int main(int, char **) { }],
[
ac_cv_cxx_visibility=yes
AC_DEFINE([GCC_VISIBILITY], 1, [Define if g++ supports -fvisibility])
],
[
ac_cv_cxx_visibility=no
CXXFLAGS="$save_CXXFLAGS"
])
AC_MSG_RESULT([$ac_cv_cxx_visibility])])