Patch for Fusion regression.

[Flast]

Boost.Fusion has a regression (#11211) in 1.58 release: this PR publish a patch to fix it, including boostorg/fusion#70, boostorg/fusion#71 and boostorg/fusion#72.

CC: @djowel , @daminetreg

[daminetreg]

That's a good idea @Flast I think it's nice so. 😄

[djowel]

I do not have write access here, so you'll probably have to ask the maintainers of boostorg master. It might be a good idea to ask the Boost List.

[Flast]

Thank you, @djowel, @daminetreg and @danieljames !

[Arfrever]

The patch (http://www.boost.org/patches/1_58_0/0002-Fix-a-regression-with-non-constexpr-types.patch) is difficult to apply for anybody who would want to use it.

Paths in this patch (excluding a/ prefix):

include/boost/fusion/adapted/struct/detail/define_struct.hpp
include/boost/fusion/adapted/struct/detail/define_struct_inline.hpp
test/sequence/adapt_struct.cpp
test/sequence/define_struct.cpp
test/sequence/define_struct_inline.cpp

Paths existing in boost_1_58_0.tar.bz2:

boost/fusion/adapted/struct/detail/define_struct.hpp
boost/fusion/adapted/struct/detail/define_struct_inline.hpp
libs/fusion/test/sequence/adapt_struct.cpp
libs/fusion/test/sequence/define_struct.cpp
libs/fusion/test/sequence/define_struct_inline.cpp

No value of -p option of patch tool would allow to apply this patch.
Application of patch is impossible without manual modification of patch.

[daminetreg]

Oh! It looks like the patch was generated for boost cloned out of github and not the zip distribution. This is bad indeed, I'll regenerate it and submit it here.

[daminetreg]

@Arfrever the patch is to be executed prior the build in the subfolder libs/fusion. 😄 Then it will work.

[Arfrever]

No. It will not work, unless you claim that patch tool printing errors about non-findable files and returning with non-zero exit status can be treated as a patch working.

$ tar -xjf boost_1_58_0.tar.bz2
$ wget -q http://www.boost.org/patches/1_58_0/0002-Fix-a-regression-with-non-constexpr-types.patch
$ cd boost_1_58_0/libs/fusion
$ patch -p1 < ../../../0002-Fix-a-regression-with-non-constexpr-types.patch
can't find file to patch at input line 5
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff --git a/include/boost/fusion/adapted/struct/detail/define_struct.hpp b/include/boost/fusion/adapted/struct/detail/define_struct.hpp
|index 2554292..ce3737e 100644
|--- a/include/boost/fusion/adapted/struct/detail/define_struct.hpp
|+++ b/include/boost/fusion/adapted/struct/detail/define_struct.hpp
--------------------------
File to patch: 
Skip this patch? [y] y
Skipping patch.
8 out of 8 hunks ignored
can't find file to patch at input line 81
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
--------------------------
|diff --git a/include/boost/fusion/adapted/struct/detail/define_struct_inline.hpp b/include/boost/fusion/adapted/struct/detail/define_struct_inline.hpp
|index a5a3ae0..a037ffe 100644
|--- a/include/boost/fusion/adapted/struct/detail/define_struct_inline.hpp
|+++ b/include/boost/fusion/adapted/struct/detail/define_struct_inline.hpp
--------------------------
File to patch: 
Skip this patch? [y] y
Skipping patch.
2 out of 2 hunks ignored
patching file test/sequence/adapt_struct.cpp
patching file test/sequence/define_struct.cpp
patching file test/sequence/define_struct_inline.cpp
$ echo $?
1
$ 

[daminetreg]

Sorry I've been writing this too fast as I was too tired. Definitely I'll regenerate the patch on the right tree.

[daminetreg]

A fixed patch appliable with git apply 0002-Fix-a-regression-with-non-constexpr-types.patch is proposed in #87