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authorLasse Collin <lasse.collin@tukaani.org>2020-02-21 17:01:15 +0200
committerLasse Collin <lasse.collin@tukaani.org>2020-03-11 12:05:57 +0200
commit6117955af0b9cef5acde7859e86f773692b5f43c (patch)
tree759ab4ed82786a6eb1a7bd44a1f9fe4117b06625
parentxz: Silence a warning when sig_atomic_t is long int. (diff)
downloadxz-6117955af0b9cef5acde7859e86f773692b5f43c.tar.xz
Build: Add visibility.m4 from gnulib.
Appears that this file used to get included as a side effect of gettext. After the change to gettext version requirements this file no longer got copied to the package and so the build was broken.
-rw-r--r--m4/.gitignore1
-rw-r--r--m4/visibility.m477
2 files changed, 77 insertions, 1 deletions
diff --git a/m4/.gitignore b/m4/.gitignore
index 18d4a4f2..815e14ce 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -33,7 +33,6 @@ stdint_h.m4
threadlib.m4
uintmax_t.m4
ulonglong.m4
-visibility.m4
wchar_t.m4
wint_t.m4
xsize.m4
diff --git a/m4/visibility.m4 b/m4/visibility.m4
new file mode 100644
index 00000000..9f493bab
--- /dev/null
+++ b/m4/visibility.m4
@@ -0,0 +1,77 @@
+# visibility.m4 serial 6
+dnl Copyright (C) 2005, 2008, 2010-2020 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 Mac OS 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 CFLAG_VISIBILITY.
+dnl Defines and sets the variable HAVE_VISIBILITY.
+
+AC_DEFUN([gl_VISIBILITY],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ CFLAG_VISIBILITY=
+ HAVE_VISIBILITY=0
+ 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 $CPPFLAGS.
+ AC_CACHE_CHECK([whether the -Werror option is usable],
+ [gl_cv_cc_vis_werror],
+ [gl_save_CFLAGS="$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"
+ ])
+ dnl Now check whether visibility declarations are supported.
+ AC_CACHE_CHECK([for simple visibility declarations],
+ [gl_cv_cc_visibility],
+ [gl_save_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS -fvisibility=hidden"
+ dnl We use the option -Werror and a function dummyfunc, because on some
+ dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
+ dnl "visibility attribute not supported in this configuration; ignored"
+ dnl at the first function definition in every compilation unit, and we
+ dnl don't want to use the option in this case.
+ if test $gl_cv_cc_vis_werror = yes; then
+ CFLAGS="$CFLAGS -Werror"
+ fi
+ 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);
+ void dummyfunc (void) {}
+ ]],
+ [[]])],
+ [gl_cv_cc_visibility=yes],
+ [gl_cv_cc_visibility=no])
+ CFLAGS="$gl_save_CFLAGS"
+ ])
+ if test $gl_cv_cc_visibility = yes; then
+ CFLAG_VISIBILITY="-fvisibility=hidden"
+ HAVE_VISIBILITY=1
+ fi
+ fi
+ AC_SUBST([CFLAG_VISIBILITY])
+ AC_SUBST([HAVE_VISIBILITY])
+ AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
+ [Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
+])