From: Ian Lynagh <igloo@earth.li>
Date: Tue, 23 Nov 2010 17:05:41 +0000 (+0000)
Subject: Add a configure test for the visibility hidden attribute
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=b6fff39114fee90b806ed2e29cc8f5d9728d85a8

Add a configure test for the visibility hidden attribute
---

diff --git a/aclocal.m4 b/aclocal.m4
index c50d348..288fd83 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -35,6 +35,24 @@ AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
 ])
 
 
+# FP_VISIBILITY_HIDDEN
+# ----------------------------------
+# Is the visibility hidden attribute supported?
+AC_DEFUN([FP_VISIBILITY_HIDDEN],
+[
+    AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
+    echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
+    if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
+    then
+        AC_MSG_RESULT([yes])
+        AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
+    else
+        AC_MSG_RESULT([no])
+    fi
+    rm -f conftest.c conftest.o
+])
+
+
 # FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
 # ----------------------------------
 # Little endian Arm on Linux with some ABIs has big endian word order
diff --git a/configure.ac b/configure.ac
index b09c5a7..5e88777 100644
--- a/configure.ac
+++ b/configure.ac
@@ -835,6 +835,8 @@ AC_COMPILE_IFELSE(
     [AC_MSG_RESULT(no)])
 CFLAGS="$CFLAGS2"
 
+FP_VISIBILITY_HIDDEN
+
 dnl ** check for librt
 AC_CHECK_LIB(rt, clock_gettime)
 AC_CHECK_FUNCS(clock_gettime timer_create timer_settime)
diff --git a/includes/Rts.h b/includes/Rts.h
index 394eb97..51351fa 100644
--- a/includes/Rts.h
+++ b/includes/Rts.h
@@ -51,7 +51,7 @@ extern "C" {
 // Symbols that are extern, but private to the RTS, are declared
 // with visibility "hidden" to hide them outside the RTS shared
 // library.
-#if !defined(mingw32_HOST_OS)
+#if defined(HAS_VISIBILITY_HIDDEN)
 #define RTS_PRIVATE  GNUC3_ATTRIBUTE(visibility("hidden"))
 #else
 #define RTS_PRIVATE  /* disabled: RTS_PRIVATE */
diff --git a/rts/BeginPrivate.h b/rts/BeginPrivate.h
index 6a7ca5f..6471b92 100644
--- a/rts/BeginPrivate.h
+++ b/rts/BeginPrivate.h
@@ -5,6 +5,6 @@
 /* On Windows, with gcc 4.5.0-1, using visibility hidden gives:
        error: visibility attribute not supported in this configuration; ignored
    */
-#if __GNUC__ >= 4 && !defined(freebsd_HOST_OS) && !defined(mingw32_HOST_OS)
+#if defined(HAS_VISIBILITY_HIDDEN) && !defined(freebsd_HOST_OS)
 #pragma GCC visibility push(hidden)
 #endif
diff --git a/rts/EndPrivate.h b/rts/EndPrivate.h
index f0080be..4cfb68f 100644
--- a/rts/EndPrivate.h
+++ b/rts/EndPrivate.h
@@ -1,3 +1,3 @@
-#if __GNUC__ >= 4 && !defined(freebsd_HOST_OS) && !defined(mingw32_HOST_OS)
+#if defined(HAS_VISIBILITY_HIDDEN) && !defined(freebsd_HOST_OS)
 #pragma GCC visibility pop
 #endif