From: Ivo Raisr <ivosh@ivosh.net>
Date: Fri, 28 Jul 2017 20:49:20 +0000 (+0000)
Subject: Check whether it is ok to use compiler flag '-pie'.
X-Git-Tag: VALGRIND_3_14_0~308
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=184fc7a804a6ea5e35902ff08fc788905fcb4641;p=thirdparty%2Fvalgrind.git

Check whether it is ok to use compiler flag '-pie'.
Some compilers actually do not support -pie and report its usage
as an error. We need to check if it is safe to use it first.
n-i-bz


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@16463
---

diff --git a/configure.ac b/configure.ac
index b1ca652eaa..40123f4c39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2177,6 +2177,27 @@ AC_MSG_RESULT([no])
 AM_CONDITIONAL([HAVE_ASM_CONSTRAINT_P], [test x$ac_have_asm_constraint_p = xyes])
 
 
+# Does this compiler and linker support -pie?
+# Some compilers actually do not support -pie and report its usage
+# as an error. We need to check if it is safe to use it first.
+
+AC_MSG_CHECKING([if gcc accepts -pie])
+
+safe_CFLAGS=$CFLAGS
+CFLAGS="-pie"
+
+AC_LINK_IFELSE([AC_LANG_PROGRAM([[ ]], [[
+  return 0;
+]])], [
+AC_SUBST([FLAG_PIE], ["-pie"])
+AC_MSG_RESULT([yes])
+], [
+AC_SUBST([FLAG_PIE], [""])
+AC_MSG_RESULT([no])
+])
+CFLAGS=$safe_CFLAGS
+
+
 # Does this compiler support -no-pie?
 # On Ubuntu 16.10+, gcc produces position independent executables (PIE) by
 # default. However this gets in the way with some tests, we use -no-pie
diff --git a/gdbserver_tests/Makefile.am b/gdbserver_tests/Makefile.am
index bdf0c5b84b..1a5c51356a 100644
--- a/gdbserver_tests/Makefile.am
+++ b/gdbserver_tests/Makefile.am
@@ -167,5 +167,5 @@ AM_CXXFLAGS += $(AM_FLAG_M3264_PRI)
 
 LDADD = -lpthread
 
-main_pic_LDFLAGS = -pie
+main_pic_LDFLAGS = @FLAG_PIE@
 main_pic_CFLAGS	 = $(AM_CFLAGS) -fPIC