leif wrote:
> Benjamin Hackl wrote:
>> I have a very similar setup (gcc 6.1.1 20160602 on Arch Linux), and I'm
>> struggling quite hard to build 7.2:
>>
> [SNIP]
>
>> The next failure then occurs when the Sage library modules are compiled:
>> as I couldn't find out how to add '-std=gnu++98' for a single module,
>
> The "clean" way is to add
>
> # distutils: extra_compile_args = -std=c++98
>
> (usually to included pxd files, e.g. src/sage/libs/linbox/linbox.pxd)
> but this apparently doesn't work for modules with additional
> extra_compile_args in src/module_list.py, so you can (or have to) add it
> there.
>
>
>> I called CFLAGS="$CFLAGS -std=gnu++98" make (which might be the culprit;
>> I know too little about how the building process works ...), let it
>> compile for a while and switched back to just "make -j4" by interrupting
>> and restarting. This lets the compilation of the modules finish, but...
>
> Doesn't work for me (yet) with vanilla FSF GCC 6.1.0, I'm still getting
> errors despite of passing '-std=c++98' (or '-std=gnu++98',
> '-fpermissive'), e.g. in sage/matrix/matrix_modn_sparse, but not all
> that use LinBox (some of them compile when '-std=c++98' gets added).
>
> Perhaps something for a cythonist, or some GCC bug that got fixed in
> Arch's version as the module did compile for you?
Nope, just Cython weirdness, it simply got compiled as C++.
The following works for me to let the whole Sage library build with GCC
6.1 (without setting any flags in the environment):
diff --git a/src/module_list.py b/src/module_list.py
index a49ed36..8441106 100644
--- a/src/module_list.py
+++ b/src/module_list.py
@@ -926,7 +926,7 @@ ext_modules = [
libraries = ['ntl', 'linbox', 'givaro', 'mpfr', 'gmpxx',
'gmp'] + cblas_libs,
library_dirs = cblas_library_dirs,
include_dirs = cblas_include_dirs,
- extra_compile_args = ['-DDISABLE_COMMENTATOR'] +
givaro_extra_compile_args),
+ extra_compile_args = ['-std=c++98',
'-DDISABLE_COMMENTATOR'] + givaro_extra_compile_args),
Extension('sage.matrix.matrix_modn_dense_double',
sources = ['sage/matrix/matrix_modn_dense_double.pyx'],
@@ -934,7 +934,7 @@ ext_modules = [
libraries = ['ntl', 'linbox', 'givaro', 'mpfr', 'gmpxx',
'gmp'] + cblas_libs,
library_dirs = cblas_library_dirs,
include_dirs = cblas_include_dirs,
- extra_compile_args = ["-D_XPG6", "-DDISABLE_COMMENTATOR"]
+ extra_compile_args = ['-std=c++98', "-D_XPG6",
"-DDISABLE_COMMENTATOR"]
+ m4ri_extra_compile_args + givaro_extra_compile_args),
Extension('sage.matrix.matrix_modn_sparse',
diff --git a/src/sage/libs/linbox/linbox.pxd
b/src/sage/libs/linbox/linbox.pxd
index 0afd7bf..87a5e79 100644
--- a/src/sage/libs/linbox/linbox.pxd
+++ b/src/sage/libs/linbox/linbox.pxd
@@ -1,3 +1,6 @@
+# distutils: language = c++
+# distutils: extra_compile_args = -std=c++98
+
from sage.libs.gmp.types cimport mpz_t
include 'sage/modules/vector_modn_sparse_h.pxi'
diff --git a/src/sage/matrix/matrix_modn_sparse.pxd
b/src/sage/matrix/matrix_modn_sparse.pxd
index 5273ec3..14a98e7 100644
--- a/src/sage/matrix/matrix_modn_sparse.pxd
+++ b/src/sage/matrix/matrix_modn_sparse.pxd
@@ -1,3 +1,5 @@
+# distutils: language = c
+
cimport matrix_sparse
include 'sage/modules/vector_modn_sparse_h.pxi'
>> ... then I get a segfault (last few lines are at
>> http://pastebin.com/CBXhNN9P -- and I uploaded my full install.log to
>> http://benjamin-hackl.at/downloads/behackl-20160629.install.log).
>>
>> Unfortunately, the reason for this is not that obvious to me---does
>> anyone have an idea or suggestions (besides downgrading my gcc...)? :-|
>
> No idea. (All I can see is that it happens early when trying to
> initialize libsingular.)
Now the same situation here; Sage segfaults (in initializing
libsingular), as does './sage --singular'.
So we'd have to take a closer look at the Singular package, which
unfortunately(?) is kind of obsolete at the moment (recently got
downgraded from 4.x to 3.1.7p1 again.)
Seems while it /compiles/ in C++14 mode with a trivial syntactic fix,
the resulting code is no longer functional. I'll try to (re)build it
with '-std=c++11' or '-std=c++98'...
-leif
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