add Exiv2 (#3503)

* initial commit Exiv2 build_tarballs.jl

* remove gettext, add newline at eof, make musl expat delete more specific

* add patch for i686-linux-musl to get around strong stack protection issues

* Update E/Exiv2/build_tarballs.jl

Co-authored-by: Mosè Giordano <giordano@users.noreply.github.com>

E/Exiv2/build_tarballs.jl

@@ -0,0 +1,66 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+using BinaryBuilder, Pkg
+
+name = "Exiv2"
+version = v"0.27.4"
+
+# Collection of sources required to complete build
+sources = [
+    ArchiveSource("https://github.com/Exiv2/exiv2/archive/refs/tags/v$(version).tar.gz", "9fb2752c92f63c9853e0bef9768f21138eeac046280f40ded5f37d06a34880d9"),
+    DirectorySource("./bundled")
+]
+
+# Bash recipe for building across all platforms
+script = raw"""
+
+cd $WORKSPACE/srcdir/exiv2-*
+
+if [[ "${target}" == x86_64-linux-musl ]]; then
+    # Delete libexpat to prevent it from being picked up by mistake
+    rm /usr/lib/libexpat.so*
+
+elif [[ "${target}" == i686-linux-musl ]]; then
+
+    #otherwise, patch fails with different line endings message
+    dos2unix cmake/compilerFlags.cmake
+    
+    atomic_patch -p1 ${WORKSPACE}/srcdir/patches/i686-musl-comment-stack-protector-strong.patch
+
+fi
+
+mkdir build
+cd build/
+
+cmake .. \
+-DCMAKE_INSTALL_PREFIX=$prefix \
+-DCMAKE_TOOLCHAIN_FILE=${CMAKE_TARGET_TOOLCHAIN} \
+-DCMAKE_BUILD_TYPE=Release \
+-DEXIV2_BUILD_SAMPLES=OFF \
+-DIconv_INCLUDE_DIR=${includedir}
+
+make -j${nproc}
+make install
+"""
+
+# These are the platforms we will build for by default, unless further
+# platforms are passed in on the command line
+platforms = expand_cxxstring_abis(supported_platforms(; experimental=true))
+
+
+# The products that we will ensure are always built
+products = [
+    LibraryProduct("libexiv2", :libexiv2),
+    ExecutableProduct("exiv2", :exiv2)
+]
+
+# Dependencies that must be installed before this package can be built
+dependencies = [
+    Dependency(PackageSpec(name="Zlib_jll", uuid="83775a58-1f1d-513f-b197-d71354ab007a"))
+    Dependency("Expat_jll"; compat="2.2.10")
+    Dependency(PackageSpec(name="libpng_jll", uuid="b53b4c65-9356-5827-b1ea-8c7a1a84506f"))
+    Dependency(PackageSpec(name="Libiconv_jll", uuid="94ce4f54-9a6c-5748-9c1c-f9c7231a4531"))
+]
+
+# Build the tarballs, and possibly a `build.jl` as well.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6")

E/Exiv2/bundled/patches/i686-musl-comment-stack-protector-strong.patch

@@ -0,0 +1,17 @@
+diff --git a/cmake/compilerFlags.cmake b/cmake/compilerFlags.cmake
+index 35faf50..5421607 100644
+--- a/cmake/compilerFlags.cmake
++++ b/cmake/compilerFlags.cmake
+@@ -34,9 +34,9 @@ if ( MINGW OR UNIX OR MSYS ) # MINGW, Linux, APPLE, CYGWIN
+             if(HAS_FCF_PROTECTION)
+                 add_compile_options(-fcf-protection)
+             endif()
+-            if(HAS_FSTACK_PROTECTOR_STRONG)
+-                add_compile_options(-fstack-protector-strong)
+-            endif()
++           # if(HAS_FSTACK_PROTECTOR_STRONG)
++           #     add_compile_options(-fstack-protector-strong)
++           # endif()
+         endif()
+
+         add_compile_options(-Wp,-D_GLIBCXX_ASSERTIONS)