[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7331/8267] grub2: fix build on gcc where _FORTIFY_SOURCE is defined

[Emmanuele Bassi <ebassi src gnome org>]

commit ed52aa9e79d713c79aff787bcf3ac9168970f4ac
Author: Martin Jansa <martin jansa gmail com>
Date:   Wed Aug 23 00:10:20 2017 +0200

    grub2: fix build on gcc where _FORTIFY_SOURCE is defined
    
    * e.g. with gentoo gcc-7.1 they define _FORTIFY_SOURCE by default with:
      
https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/gcc/7.1.0/gentoo/10_all_default-fortify-source.patch?view=markup
      which results in following error while building grub-efi-native:
      ./config-util.h:1504:48: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]
                   || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
                                                      ^~~~~~~~~~~~~~~
      this part comes from gnulib and it's used only for Apple and BSD,
      so we can ignore it, but we cannot add -Wno-error=expansion-to-defined
      because this warning was introduced only in gcc-7 and older gcc
      will fail with:
      cc1: error: -Werror=expansion-to-defined: no option -Wexpansion-to-defined
      use #pragma to work around this
    
    (From OE-Core rev: f5302b0ad2942f7705d46c33949ebc1c5ddf3f58)
    
    Signed-off-by: Martin Jansa <Martin Jansa gmail com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 .../grub/files/fix.build.with.gcc-7.patch          |   39 ++++++++++++++++++++
 meta/recipes-bsp/grub/grub2.inc                    |    1 +
 2 files changed, 40 insertions(+), 0 deletions(-)
---
diff --git a/meta/recipes-bsp/grub/files/fix.build.with.gcc-7.patch 
b/meta/recipes-bsp/grub/files/fix.build.with.gcc-7.patch
new file mode 100644
index 0000000..f35df97
--- /dev/null
+++ b/meta/recipes-bsp/grub/files/fix.build.with.gcc-7.patch
@@ -0,0 +1,39 @@
+* e.g. with gentoo gcc-7.1 they define _FORTIFY_SOURCE by default with:
+  
https://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo/src/patchsets/gcc/7.1.0/gentoo/10_all_default-fortify-source.patch?view=markup
+  which results in following error while building grub-efi-native:
+  ./config-util.h:1504:48: error: this use of "defined" may not be portable [-Werror=expansion-to-defined]
+               || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
+                                                  ^~~~~~~~~~~~~~~
+  this part comes from gnulib and it's used only for Apple and BSD,
+  so we can ignore it, but we cannot add -Wno-error=expansion-to-defined
+  because this warning was introduced only in gcc-7 and older gcc
+  will fail with:
+  cc1: error: -Werror=expansion-to-defined: no option -Wexpansion-to-defined
+  use #pragma to work around this
+
+Upstream-Status: Pending (should be fixed in gnulib which is then rarely updated in grub)
+
+Signed-off-by: Martin Jansa <Martin Jansa gmail com>
+
+diff -uNr grub-2.02.old/m4/extern-inline.m4 grub-2.02/m4/extern-inline.m4
+--- grub-2.02.old/m4/extern-inline.m4  2016-02-28 15:22:21.000000000 +0100
++++ grub-2.02/m4/extern-inline.m4      2017-08-22 19:26:45.213637276 +0200
+@@ -39,6 +39,10 @@
+    OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
+    for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
+    Assume DragonFly and FreeBSD will be similar.  */
++#pragma GCC diagnostic push
++#if __GNUC__ >= 7
++#pragma GCC diagnostic ignored "-Wexpansion-to-defined"
++#endif
+ #if (((defined __APPLE__ && defined __MACH__) \
+       || defined __DragonFly__ || defined __FreeBSD__) \
+      && (defined __header_inline \
+@@ -50,6 +52,7 @@
+                 && defined __GNUC__ && ! defined __cplusplus))))
+ # define _GL_EXTERN_INLINE_STDHEADER_BUG
+ #endif
++#pragma GCC diagnostic pop
+ #if ((__GNUC__ \
+       ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
+       : (199901L <= __STDC_VERSION__ \
diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc
index 240a1f9..a56fbe7 100644
--- a/meta/recipes-bsp/grub/grub2.inc
+++ b/meta/recipes-bsp/grub/grub2.inc
@@ -17,6 +17,7 @@ SRC_URI = "https://ftp.gnu.org/gnu/grub/grub-${PV}.tar.gz \
            file://autogen.sh-exclude-pc.patch \
            file://grub-module-explicitly-keeps-symbole-.module_license.patch \
            file://0001-grub.d-10_linux.in-add-oe-s-kernel-name.patch \
+          file://fix.build.with.gcc-7.patch \
 "
 SRC_URI[md5sum] = "1116d1f60c840e6dbd67abbc99acb45d"
 SRC_URI[sha256sum] = "660ee136fbcee08858516ed4de2ad87068bfe1b6b8b37896ce3529ff054a726d"