gtk2_ardour/wscript:15:1 redefinition of unused 'TaskGen' from line 3
wscript:102:9 dictionary key 'sse' repeated with different values
wscript:104:9 dictionary key 'sse' repeated with different values
Found via `codespell -q 3 -S *.po,./share/patchfiles,./libs -L ba,buss,busses,doubleclick,hsi,ontop,ro,seh,siz,sord,sur,te,trough,ue`
Follow-up to 364f2f078
See also af69061644 and b8e1cd53c. This can be useful in
some cases where running a dry-run build will fail.
e.g. with --freedesktop files that are not generated before the
actual build.
This breaks windows builds, since apparently build(bld) is
evaluated twice (once to write compile_commands.json and once
to compile), even though `obj` is reset.
eg. in libs/pbd/wscript
```
if bld.env['build_target'] == 'mingw':
obj.source += [ 'windows_special_dirs.cc' ]
```
results in
[ 65/1159] Compiling libs/pbd/windows_special_dirs.cc
[ 69/1159] Compiling libs/pbd/windows_special_dirs.cc
which then produces an error when linking:
```
/usr/bin/x86_64-w64-mingw32-ld: libs/pbd/windows_special_dirs.cc.2.o:libs/pbd/windows_special_dirs.cc:28: multiple definition of `PBD::get_win_special_folder_path[abi:cxx11](int)'; libs/pbd/windows_special_dirs.cc.2.o:libs/pbd/windows_special_dirs.cc:28: first defined here
```
This enables the generation of build/compile_commands.json
which is a compilation database recognized by some IDE/editors
to provide compiler quality linting.
To name a few:
- Visual Studio Code
- VIM (with ALE plugin)
With glib 2.64, volatile gint produce annoying Wcast-qual
compiler warnings with mingw/gcc-8.
Even though the the build succeeds, and only glib 2.68+
requires non-volatile atomics this results in a much
cleaner build-log.
bind.hpp:36:1: note: ‘#pragma message: The practice of declaring the
Bind placeholders (_1, _2, ...) in the global namespace is deprecated.
Please use <boost/bind/bind.hpp> + using namespace boost::placeholders,
or define BOOST_BIND_GLOBAL_PLACEHOLDERS to retain the current behavior.
Older compilers do not yet have fmaintrin.h. This fixes compile errors:
```
x86_functions_fma.cc:51:39: error: '_mm_fmadd_ss' was not declared in this scope
x86_functions_fma.cc:85:35: error: '_mm256_fmadd_ps' was not declared in this scope
x86_functions_fma.cc:106:35: error: '_mm256_fmadd_ps' was not declared in this scope
x86_functions_fma.cc:129:39: error: '_mm_fmadd_ss' was not declared in this scope
```
By supporting FMA extension, the number of instruction needed
for multiply accumulate to mix channels are reduced. Since,
this extension has been around since middle of 2012, more
computers have this instruction set available.
mmacosx-version-min also needs to be set during linking, otherwise
the Finder will not allow to launch the application on older systems
"The application requires os X 10.XX or later"
(with XX being the build-host's OS version), even though
Ardour can be started from a terminal on target due to correct
c/cxxflags.
Apparently gcc-6.2 with -O3 and -mfpu=neon can use ARM instructions
that requires 64bit alignment (here vst1.64) with data that
is not 64bit aligned (g->strcache) https://i.imgur.com/vYktsUn.png
So we need to be able to build "arm_neon_functions.cc" with
-mfpu=neon, while not automatically using NEON for the rest
of the codebase, unless explicitly asked for.
