On 05/06/15 17:02, Michael Felt wrote:
> Attribute "constructor" is not supported
Does the attached patch help?
thanks,
Pádraig.
>From 2356b3663f8d08b7d3d1e4496f22dcea3c5b76b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A1draig=20Brady?= <p...@draigbrady.com>
Date: Fri, 5 Jun 2015 18:49:48 +0100
Subject: [PATCH] build: improve checks for stdbuf support
* configure.ac: Actually run the test program to
verify the constructor attribute is supported,
or when cross compiling enable -Werror so that
warnings about ignored attributes are significant.
Fixes a build failure on AIX.
---
configure.ac | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/configure.ac b/configure.ac
index c159983..5e0d0ca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -455,7 +455,11 @@ if test $gl_cv_list_mounted_fs = yes && test $gl_cv_fs_space = yes; then
fi
AC_MSG_CHECKING([whether this is system supports stdbuf])
-AC_COMPILE_IFELSE(
+ac_save_CFLAGS="$CFLAGS"
+# Build with -Werror to detect warnings about
+# about ignored "constructor" arguments.
+CFLAGS="$CFLAGS -Werror"
+AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
static int stdbuf = 0;
@@ -471,7 +475,20 @@ AC_COMPILE_IFELSE(
return !(stdbuf == 1);]])
],
[stdbuf_supported=yes],
- [stdbuf_supported=no])
+ [stdbuf_supported=no],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE([[
+ void __attribute__ ((constructor))
+ stdbuf_cross_test (void)
+ #if __ELF__
+ {}
+ #endif
+ ]])
+ ],
+ [stdbuf_supported=yes],
+ [stdbuf_supported=no])
+ ])
+CFLAGS="$ac_save_CFLAGS"
AC_MSG_RESULT([$stdbuf_supported])
if test "$stdbuf_supported" = "yes" && test -z "$EXEEXT"; then
gl_ADD_PROG([optional_bin_progs], [stdbuf])
--
2.4.1
