From 9ef0694cf0b06c148d3dcba315f2b94a1865a1dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Thu, 13 Oct 2005 17:12:13 +0200
Subject: [PATCH] * configure.ac (ASM_MARK_NOEXEC_STACK): Check if the C
compiler generates a .note.GNU-stack section. If so, we should do the same in
our assembler files.
Rev: src/nettle/configure.ac:1.63
---
configure.ac | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/configure.ac b/configure.ac
index 411c0744..55fc3e30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -181,6 +181,7 @@ AC_SUBST([CCPIC_MAYBE])
ASM_SYMBOL_PREFIX=''
ASM_ELF_STYLE='no'
+ASM_MARK_NOEXEC_STACK=''
if test x$enable_assembler = xyes ; then
AC_CACHE_CHECK([if globals are prefixed by underscore],
@@ -201,6 +202,30 @@ if test x$enable_assembler = xyes ; then
if test x$nettle_cv_asm_underscore = xyes ; then
ASM_SYMBOL_PREFIX='_'
fi
+
+ AC_CACHE_CHECK([if we should use a .note.GNU-stack section],
+ nettle_cv_asm_gnu_stack,
+ [ # Default
+ nettle_cv_asm_gnu_stack=no
+
+ cat >conftest.c <<EOF
+int foo() { return 0; }
+EOF
+ nettle_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >conftest.out 2>&1"
+ if AC_TRY_EVAL(nettle_compile); then
+ cat conftest.out >&AC_FD_CC
+ objdump -x conftest.o | grep '\.note\.GNU-stack' > /dev/null \
+ && nettle_cv_asm_gnu_stack=yes
+ else
+ cat conftest.out >&AC_FD_CC
+ echo "configure: failed program was:" >&AC_FD_CC
+ cat conftest.s >&AC_FD_CC
+ fi
+ rm -f conftest.*])
+ if test x$nettle_cv_asm_gnu_stack = xyes ; then
+ ASM_MARK_NOEXEC_STACK='.section .note.GNU-stack,"",@progbits'
+ fi
+
# With inspiration from GMP_TRY_ASSEMBLE
AC_CACHE_CHECK([for ELF-style pseudo-ops],
nettle_cv_asm_elf_style_pseudo_ops,
@@ -231,6 +256,7 @@ fi
AC_SUBST(ASM_SYMBOL_PREFIX)
AC_SUBST(ASM_ELF_STYLE)
+AC_SUBST(ASM_MARK_NOEXEC_STACK)
AC_SUBST(SHLIBCFLAGS)
AC_SUBST(SHLIBMAJOR)
--
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