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This commit adds support for vanilla gcc (not the gcc binary that comes with
Xcode command line tools which is clang in disguise) on Mac OS 10.9.
Specifically:

1. Adds -stdlib=libstdc++ option only when compiling with clang since vanilla
gcc does not recognize this option.

2. Removes the -rdynamic option from src/makefiles/darwin_10_9.mk since it was
causing an undefined option error with vanilla gcc on Mac OS 10.9. This worked
in the past because Apple's gcc compiler was silently ignoring the -rdynamic
option (it is for ELF binaries only). Apparently the behavior enabled by this
option, adding all symbols to the dynamic symbol table, is the default
behavior on Darwin.

3. Adds -flax-vector-conversions option when compiling with vanilla gcc. This
tells recent versions of gcc to allow vector conversions without an explicit
cast provided the vectors are of the same size.

4. Defines CC to be the same compiler as CXX to avoid different parts of the
codebase being linked with different C++ standard libraries when CXX
definition is overridden by the environment but CC is not. This is again
related to clang linking with libc++ by default.

5. Adds -Wno-unused-local-typedefs option to silence the annoying typedef
warnings originating from openfst.

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Relevant error message:
../fstext/prune-special-inl.h:164:26: error: redefinition of default argument
                  size_t max_states = 0) {
                         ^            ~
../fstext/prune-special.h:52:26: note: previous definition is here
                  size_t max_states =  0);
                         ^             ~

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merge Makefile changes from ^/sandbox/sail; fix to ApplyExp() in cudamatrix [thanks to Vijayaditya Peddinti]

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sandbox/sail: Reverted the conditional variable assignments in tools/Makefile since make was implicitly picking up builtin variables.

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trunk: Merging changes from sail sandbox (mostly things to enable compilation to also work with C++11).

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This is a problem with c++11. See the explanation at the following address.
http://stackoverflow.com/questions/9641960/c11-make-pair-with-specified-template-parameters-doesnt-compile

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Fixes how the po object is constructed @ util/parse-options.h:240:16.

util/parse-options.h:240:16: error: no matching constructor for
initialization of 'kaldi::ParseOptions'
  ParseOptions po;

git-svn-id: https://svn.code.sf.net/p/kaldi/code/sandbox/sail@3704 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

The way these type qualifiers were used causing problems with clang. This
commit fixes their usage.

See http://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html

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This commit adds support for Mac OS 10.9 by adding a platform specific
makefile and updating configure. It also changes the way Mac OS version is
extracted from sw_vers output to make it more robust. Older script failed
to deduce the correct OS version when the version string included two fields
instead of three for instance when sw_vers returns 10.9 instead of 10.9.0.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/sandbox/sail@3702 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

This patch changes the way src/common/pa_ringbuffer.o file is added to the
portaudio library. Original script added this file to the COMMON_OBJS list. However, on some platforms this file is automatically added to the OTHER_OBJS
list and as a result pa_ringbuffer.o object is added twice to the portaudio
library. Linking against portaudio library from a piece of code using the
pa_ringbuffer results in linker errors.

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On Mac OS 10.9, g++ is actually clang in disguise which by default uses the
new c++ standard library libc++. Since openfst uses stuff from the tr1
namespace, we need to tell clang to use libstdc++ instead. This patch adds a
check to the Makefile to see if we are using clang and adds the appropriate
flag if so.

With this patch, it is also possible to pass CXX, CXXFLAGS and LDFLAGS to make
while building the tools, e.g.

kaldi/tools ~ make CXX=g++-4.8 CXXFLAGS="-std=c++11" LDFLAGS="..."

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There are a few places in irstlm code where variable length arrays of non-POD
types are causing errors with recent standards compliant c++ compilers.

mdiadapt.cpp:1115:16: error: variable length array of non-POD element type
'streampos' (aka 'fpos<mbstate_t>')
  streampos pos[lmsize()+1];
...

This use is not part of the c++ standard. Some compilers like gcc support this
through an extension while others like clang do not. This patch replaces all
VLAs of non-POD types with std::vector.

Also, configure.in is renamed to configure.ac to make recent automake
distributions happy.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/sandbox/sail@3699 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

This patch adds -ffreestanding flag to the compile flags for rfilter1 to
silence the following error thrown by recent c++ compilers.

rfilter1.c:29:5:
error: second parameter of 'main' (argument array) must be of type 'char **'
int main(int argc, char **argv)
    ^

There is a nasty typedef @ tools/sctk-2.4.0/src/rfilter1/include/stdcenvp.h:27
which maps char to unsigned char. This is supposed to be a hack for parsing
mandarin and japanese correctly. However, that typedef causes all chars in all
files including that header file to be mapped to unsigned char. While most
such mappings are benign, we have one problematic case which results in the
compiler error given above.

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* steps/paste_feats.sh : this script wraps paste-feats, which allows to combine more than 2 features streams.


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