package/ipmiutil/0003-configure.ac-fix-stack-protector-test.patch

   1 From: Baruch Siach <baruch@tkos.co.il>
   2 Date: Tue, 27 Oct 2015 13:58:24 +0200
   3 Subject: [PATCH] configure.ac: fix stack protector test
   4
   5 gcc does not generate stack protection check code for function that does not
   6 use its stack. Some toolchain (most notable uClibc based) accept the
   7 -fstack-protector option, but don't provide libssp. The current test will
   8 incorrectly identify this case, leading to link failures like:
   9
  10 ipmiutil.o: In function `main':
  11 ipmiutil.c:(.text.startup+0x1c0): undefined reference to
  12 `__stack_chk_fail_local'
  13 ialarms.o: In function `get_alarms_picmg':
  14 ialarms.c:(.text+0x1c5): undefined reference to `__stack_chk_fail_local'
  15 ialarms.o: In function `.L46':
  16 ialarms.c:(.text+0x362): undefined reference to `__stack_chk_fail_local'
  17 ialarms.o: In function `get_enc_leds':
  18 ialarms.c:(.text+0x45f): undefined reference to `__stack_chk_fail_local'
  19
  20 Add stack usage code to the test to correctly identify missing libssp.
  21
  22 Patch status: sent upstream
  23 (http://sourceforge.net/p/ipmiutil/mailman/message/34572536/)
  24
  25 Signed-off-by: Baruch Siach <baruch@tkos.co.il>
  26 ---
  27  configure.ac | 2 +-
  28  1 file changed, 1 insertion(+), 1 deletion(-)
  29
  30 diff --git a/configure.ac b/configure.ac
  31 index 41b6ea89167a..f3f60fb9ff69 100644
  32 --- a/configure.ac
  33 +++ b/configure.ac
  34 @@ -334,7 +334,7 @@ else
  35          rm -f $tmpc $tmpo >/dev/null 2>&1
  36         echo $ECHO_N "checking compile fortify flags ... $ECHO_C"
  37         cfhard="-fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
  38 -       echo "int main() { return(1); }" >$tmpc
  39 +       echo "int main() { alloca(100); return(1); }" >$tmpc
  40         $CC -o $tmpo $cfhard $tmpc  >/dev/null 2>&1
  41         if test $? -ne 0 ; then
  42            cfhard=
  43 --
  44 2.6.1
  45