From af72a47a677ce98c08cb73444bdd741ca8e28422 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 27 Jun 2017 18:10:54 -0700
Subject: [PATCH] Add ssp_nonshared to link commandline for musl targets

when -fstack-protector options are enabled we need to
link with ssp_shared on musl since it does not provide
the __stack_chk_fail_local() so essentially it provides
libssp but not libssp_nonshared something like
TARGET_LIBC_PROVIDES_SSP_BUT_NOT_SSP_NONSHARED
 where-as for glibc the needed symbols
are already present in libc_nonshared library therefore
we do not need any library helper on glibc based systems
but musl needs the libssp_noshared from gcc

Upstream-Status: Pending

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 gcc/config/linux.h          |  7 +++++++
 gcc/config/rs6000/linux.h   | 10 ++++++++++
 gcc/config/rs6000/linux64.h | 10 ++++++++++
 3 files changed, 27 insertions(+)

diff --git a/gcc/config/linux.h b/gcc/config/linux.h
index ba02c013e30..8fcaa0c9faf 100644
--- a/gcc/config/linux.h
+++ b/gcc/config/linux.h
@@ -203,6 +203,13 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     { GCC_INCLUDE_DIRVAR, "GCC", 0, 1, 0, 0 },		\
     { 0, 0, 0, 0, 0, 0 }				\
   }
+#ifdef TARGET_LIBC_PROVIDES_SSP
+#undef LINK_SSP_SPEC
+#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+		       "|fstack-protector-strong|fstack-protector-explicit" \
+		       ":-lssp_nonshared}"
+#endif
+
 #endif
 
 #if (DEFAULT_LIBC == LIBC_UCLIBC) && defined (SINGLE_LIBC) /* uClinux */
diff --git a/gcc/config/rs6000/linux.h b/gcc/config/rs6000/linux.h
index 47c9d9ac0b6..d065f88b377 100644
--- a/gcc/config/rs6000/linux.h
+++ b/gcc/config/rs6000/linux.h
@@ -94,6 +94,16 @@
 					 " -m elf32ppclinux")
 #endif
 
+/* link libssp_nonshared.a with musl */
+#if DEFAULT_LIBC == LIBC_MUSL
+#ifdef TARGET_LIBC_PROVIDES_SSP
+#undef LINK_SSP_SPEC
+#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+		       "|fstack-protector-strong|fstack-protector-explicit" \
+		       ":-lssp_nonshared}"
+#endif
+#endif
+
 #undef LINK_OS_LINUX_SPEC
 #define LINK_OS_LINUX_SPEC LINK_OS_LINUX_EMUL " %{!shared: %{!static: \
   %{!static-pie: \
diff --git a/gcc/config/rs6000/linux64.h b/gcc/config/rs6000/linux64.h
index a11e01faa3d..ce464f3626b 100644
--- a/gcc/config/rs6000/linux64.h
+++ b/gcc/config/rs6000/linux64.h
@@ -369,6 +369,16 @@ extern int dot_symbols;
 					   " -m elf64ppc")
 #endif
 
+/* link libssp_nonshared.a with musl */
+#if DEFAULT_LIBC == LIBC_MUSL
+#ifdef TARGET_LIBC_PROVIDES_SSP
+#undef LINK_SSP_SPEC
+#define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
+		       "|fstack-protector-strong|fstack-protector-explicit" \
+		       ":-lssp_nonshared}"
+#endif
+#endif
+
 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
   %{!static-pie: \
     %{rdynamic:-export-dynamic} \
