[packages/exiv2] fix build on platforms without control flow protection

[atler]

commit 88991cbd2ebd2466c72381e23533b1c21a1f3798
Author: Jan Palus <atler at pld-linux.org>
Date:   Wed Nov 4 01:00:52 2020 +0100

    fix build on platforms without control flow protection

 compiler_flags.patch | 31 +++++++++++++++++++++++++++++++
 exiv2.spec           |  2 ++
 2 files changed, 33 insertions(+)
---
diff --git a/exiv2.spec b/exiv2.spec
index 106ac6b..1c18405 100644
--- a/exiv2.spec
+++ b/exiv2.spec
@@ -15,6 +15,7 @@ Source0:	https://www.exiv2.org/builds/%{name}-%{version}-Source.tar.gz
 # Source0-md5:	68a59595e8617284b2e1eee528ae1f77
 Patch0:		cmake.patch
 Patch1:		%{name}-no-xmpsdk-install.patch
+Patch2:		compiler_flags.patch
 URL:		https://www.exiv2.org/
 BuildRequires:	cmake >= 3.3.2
 %{?with_curl:BuildRequires:	curl-devel}
@@ -65,6 +66,7 @@ Pliki programistyczne biblioteki do obróbki metadanych EXIF i IPTC.
 %setup -q -n %{name}-%{version}-Source
 %patch0 -p1
 %patch1 -p1
+%patch2 -p1
 
 %build
 install -d build
diff --git a/compiler_flags.patch b/compiler_flags.patch
new file mode 100644
index 0000000..af74c71
--- /dev/null
+++ b/compiler_flags.patch
@@ -0,0 +1,31 @@
+--- exiv2-0.27.3-Source/cmake/compilerFlags.cmake.orig	2020-06-30 15:33:22.000000000 +0200
++++ exiv2-0.27.3-Source/cmake/compilerFlags.cmake	2020-11-04 00:53:19.007731270 +0100
+@@ -1,4 +1,5 @@
+ # These flags applies to exiv2lib, the applications, and to the xmp code
++include(CheckCXXCompilerFlag)
+ 
+ if ( MINGW OR UNIX OR MSYS ) # MINGW, Linux, APPLE, CYGWIN
+     if (${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)
+@@ -25,13 +26,16 @@
+ 
+         # This fails under Fedora, MinGW GCC 8.3.0 and CYGWIN/MSYS 9.3.0
+         if (NOT (MINGW OR CMAKE_HOST_SOLARIS OR CYGWIN OR MSYS) )
+-            if (COMPILER_IS_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.0)
+-                add_compile_options(-fstack-clash-protection -fcf-protection)
++            check_cxx_compiler_flag(-fstack-clash-protection HAS_FSTACK_CLASH_PROTECTION)
++            check_cxx_compiler_flag(-fcf-protection HAS_FCF_PROTECTION)
++            check_cxx_compiler_flag(-fstack-protector-strong HAS_FSTACK_PROTECTOR_STRONG)
++            if(HAS_FSTACK_CLASH_PROTECTION)
++                add_compile_options(-fstack-clash-protection)
+             endif()
+-
+-            if( (COMPILER_IS_GCC   AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 5.0) # Not in GCC 4.8
+-            OR  (COMPILER_IS_CLANG AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.7) # Not in Clang 3.4.2
+-            )
++            if(HAS_FCF_PROTECTION)
++                add_compile_options(-fcf-protection)
++            endif()
++            if(HAS_FSTACK_PROTECTOR_STRONG)
+                 add_compile_options(-fstack-protector-strong)
+             endif()
+         endif()
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/packages/exiv2.git/commitdiff/88991cbd2ebd2466c72381e23533b1c21a1f3798