buildroot

gc/configure.ac: add check for NO_GETCONTEXT definition

​

This patch is ported from bdwgc package. Since Gauche uses an internal

copy of the boehm gc code, it is affected by the same problem.

​

Both configure and configure.ac are modified because autoreconf fails

due to an incompatibility with the version of the autotools used by

Buildroot.

​

Signed-off-by: Hiroshi Kawashima <kei-k@ca2.so-net.ne.jp>

​

Original credits of patch in bdwgc package:

Signed-off-by: Samuel Martin <s.martin49@gmail.com>

[yann.morin.1998@free.fr: add a comment, change variable name, use

 AS_IF, remove debug traces, use AC_CHECK_FUNCS (as suggested by

 Thomas)]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

​

diff -ur a/gc/configure b/gc/configure

--- a/gc/configure  2015-11-12 21:41:02.394822056 +0900

+++ b/gc/configure  2015-11-12 22:04:14.655157423 +0900

@@ -16153,6 +16153,23 @@

 $as_echo "$ac_cv_fno_strict_aliasing" >&6; }

 fi

+# Check for getcontext (uClibc can be configured without it, for example)

+for ac_func in getcontext

+do :

+  ac_fn_c_check_func "$LINENO" "getcontext" "ac_cv_func_getcontext"

+if test "x$ac_cv_func_getcontext" = xyes; then :

+  cat >>confdefs.h <<_ACEOF

+#define HAVE_GETCONTEXT 1

+_ACEOF

+

+fi

+done

+

+if test "$ac_cv_func_getcontext" = "no"; then :

+  CFLAGS="$CFLAGS -DNO_GETCONTEXT"

+   CPPFLAGS="$CPPFLAGS -DNO_GETCONTEXT"

+fi

+

 case "$host" in

 # While IRIX 6 has libdl for the O32 and N32 ABIs, it's missing for N64

 # and unnecessary everywhere.

diff -ur a/gc/configure.ac b/gc/configure.ac

--- a/gc/configure.ac   2015-11-12 22:31:44.851510997 +0900

+++ b/gc/configure.ac   2015-11-12 22:33:39.292191227 +0900

@@ -459,6 +459,12 @@

   AC_MSG_RESULT($ac_cv_fno_strict_aliasing)

 fi

+# Check for getcontext (uClibc can be configured without it, for example)

+AC_CHECK_FUNCS([getcontext])

+AS_IF([test "$ac_cv_func_getcontext" = "no"],

+  [CFLAGS="$CFLAGS -DNO_GETCONTEXT"

+   CPPFLAGS="$CPPFLAGS -DNO_GETCONTEXT"])

+

 case "$host" in

 # While IRIX 6 has libdl for the O32 and N32 ABIs, it's missing for N64

 # and unnecessary everywhere.