variable length array error in r.terraflow with clang

[kyngchaos]

Another clang compiler issue in r.terraflow:

/Users/Shared/src/GRASS/svn/dev6-r53518/dist.x86_64-apple-darwin11.4.2/include/grass/iostream/empq_impl.h:1360:41: error: 
      variable length array of non-POD element type
      'ExtendedEltMergeType<keyvalue<cclabel_type>, int>'
  ExtendedEltMergeType<T,Key> in_objects[arity];

A bit of searching tells me that non-POD variable length arrays are not part of the C++ spec, but supported as an extension in some compilers. clang does not.

[glynn]

compatibility fix

[glynn]

Replying to kyngchaos:

A bit of searching tells me that non-POD variable length arrays are not part of the C++ spec, but supported as an extension in some compilers. clang does not.

I suggest using std::vector instead; see attachment:empq.patch​

PS: the "using namespace std" should be eliminated. It's a bad idea in source files, but far worse in headers.

[vince]

+ 1. clang-3.2 seems to be build the rest of Grass fine.

[glynn]

Replying to glynn:

I suggest using std::vector instead; see attachment:empq.patch​

Applied in r54320.

[neteler]

Replying to glynn:

Applied in r54320.

Backport to GRASS 6?

[glynn]

Replying to neteler:

Backport to GRASS 6?

Yes.

The 6.5 and 7.0 versions are identical except for this fix and the header comment.

[neteler]

Also backported to 6.4 and 6.5. Closing.

[glynn]

Replying to neteler:

Also backported to 6.4 and 6.5. Closing.

FWIW, I fixed a couple of other portability issues in r54330. Two more VLAs, string literals are "const char *", and "%lf" isn't a valid printf() specifier. Issues which weren't fixed include:

• Extraneous commas at the end of enum definitions and extraneous semicolons after function definitions (these are trivial, and would add a lot of noise to the diff)
• Use of "long long" and "%lld", for which there's no easy fix.

Add -ansi and -pedantic to CXXFLAGS for the details.

[neteler]

Replying to glynn:

FWIW, I fixed a couple of other portability issues in r54330.

Backported in r54330, r54335 and r54336.

[neteler]

Unfortunately the backport is incompliant with r.terraflow in G6: {{{[neteler@north r.terraflow]$ make c++ -c -I/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include -g -Wall -DUSER=\"neteler\" -DNODATA_FIX -D_FILE_OFFSET_BITS=64 -DPACKAGE=\""grassmods"\" -DELEV_FLOAT main.cc -o OBJ.x86_64-unknown-linux-gnu/FLOAT/main.o In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq.h:33:0,

from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:41, from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:39, from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h: In member function ‘AMI_err em_buffer<T, Key>::substream_merge(AMI_STREAM<T>, unsigned int, AMI_STREAM<T>*)’: /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:989:3: error: ‘vector’ is not a member of ‘std’ /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:989:16: error: expected primary-expression before ‘*’ token /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:989:17: error: expected primary-expression before ‘>’ token /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:989:35: error: there are no arguments to ‘in_objects’ that depend on a template parameter, so a declaration of ‘in_objects’ must be available [-fpermissive] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:989:35: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated) /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:1018:46: error: ‘in_objects’ was not declared in this scope /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:1048:43: error: ‘in_objects’ was not declared in this scope /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:1053:46: error: ‘in_objects’ was not declared in this scope /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/embuffer.h:1063:15: error: ‘in_objects’ was not declared in this scope In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:39:0,

from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h: In member function ‘AMI_err em_pqueue<T, Key>::merge_buffer(em_buffer<T, Key>*, AMI_STREAM<ExtendedEltMergeType<T, Key> >*, long int)’: /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1250:3: error: ‘vector’ is not a member of ‘std’ /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1250:16: error: expected primary-expression before ‘*’ token /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1250:17: error: expected primary-expression before ‘>’ token /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1250:35: error: there are no arguments to ‘in_objects’ that depend on a template parameter, so a declaration of ‘in_objects’ must be available [-fpermissive] In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:39:0,

from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1278:41: error: ‘in_objects’ was not declared in this scope /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1313:37: error: ‘in_objects’ was not declared in this scope In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:39:0,

from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h: In member function ‘AMI_err em_pqueue<T, Key>::merge_streams(AMI_STREAM<ExtendedEltMergeType<T, Key> >, short unsigned int, AMI_STREAM<ExtendedEltMergeType<T, Key> >*, long int)’: /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1375:3: error: ‘vector’ is not a member of ‘std’ /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1375:43: error: expected primary-expression before ‘>’ token /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1375:61: error: there are no arguments to ‘in_objects’ that depend on a template parameter, so a declaration of ‘in_objects’ must be available [-fpermissive] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1399:4: error: ‘in_objects’ was not declared in this scope /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_impl.h:1427:36: error: ‘in_objects’ was not declared in this scope In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_adaptive_impl.h:30:0,

from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:41, from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_adaptive.h: In constructor ‘EMPQueueAdaptive<T, Key>::EMPQueueAdaptive(long int)’: /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/empq_adaptive.h:53:47: warning: delegating constructors only available with -std=c++11 or -std=gnu++11 [enabled by default] main.cc: In function ‘void printMaxSortSize(long int)’: main.cc:436:43: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long unsigned int’ [-Wformat] main.cc:439:83: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long unsigned int’ [-Wformat] main.cc: In function ‘int main(int, char)’: main.cc:622:16: warning: zero-length gnu_printf format string [-Wformat-zero-length] In file included from main.cc:43:0: grass2str.h: In instantiation of ‘AMI_STREAM<T>* cell2stream(char*, elevation_type, long int*) [with T = float; elevation_type = float]’: main.cc:558:25: required from here grass2str.h:144:3: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 5 has type ‘off_t {aka long int}’ [-Wformat] In file included from /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami.h:27:0,

from common.h:27, from main.cc:39:

/home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h: In instantiation of ‘AMI_err AMI_STREAM<T>::write_item(const T&) [with T = float]’: grass2str.h:128:4: required from ‘AMI_STREAM<T>* cell2stream(char*, elevation_type, long int*) [with T = float; elevation_type = float]’ main.cc:558:25: required from here /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h:583:3: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h: In instantiation of ‘AMI_err AMI_STREAM<T>::read_item(T) [with T = short int]’: grass2str.h:193:4: required from ‘void stream2_CELL(AMI_STREAM<T>*, dimension_type, dimension_type, char*, bool) [with T = short int; dimension_type = short int]’ main.cc:575:51: required from here /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h:521:3: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h: In instantiation of ‘AMI_err AMI_STREAM<T>::read_item(T) [with T = float]’: grass2str.h:193:4: required from ‘void stream2_CELL(AMI_STREAM<T>*, dimension_type, dimension_type, char*, bool) [with T = float; dimension_type = short int]’ main.cc:580:62: required from here /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h:521:3: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h: In instantiation of ‘AMI_err AMI_STREAM<T>::read_item(T) [with T = labelElevType]’: grass2str.h:274:3: required from ‘void stream2_CELL(AMI_STREAM<T>*, dimension_type, dimension_type, FUN, char*) [with T = labelElevType; FUN = labelElevTypePrintLabel; dimension_type = short int]’ main.cc:585:26: required from here /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h:521:3: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h: In instantiation of ‘AMI_err AMI_STREAM<T>::read_item(T) [with T = sweepOutput]’: grass2str.h:448:3: required from ‘void stream2_FCELL(AMI_STREAM<T>*, dimension_type, dimension_type, FUN1, FUN2, char*, char*) [with T = sweepOutput; FUN1 = printAccumulation; FUN2 = printTci; dimension_type = short int]’ main.cc:609:36: required from here /home/neteler/grass64/dist.x86_64-unknown-linux-gnu/include/grass/iostream/ami_stream.h:521:3: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] make: * [OBJ.x86_64-unknown-linux-gnu/FLOAT/main.o] Error 1 }}}

[martinl]

Replying to neteler:

Unfortunately the backport is incompliant with r.terraflow in G6:

should be fixed in r54337 (g64). Martin