With GCC 6.1.0, "the default, if no C++ language dialect options are given,
is -std=gnu++14"
C++ code in some packages is not C++14 compatible. Adding the option
-std=gnu++03 to the CXXFLAGS environment variable lets almost everything
compile fine, except the singular-3.1.7p1.p1 package.
The relevant error message ist:
g++ -LDownloads/tmp/sage-7.1/local/lib
-Wl,-rpath,Downloads/tmp/sage-7.1/local/lib -march=native -O3 -g -pipe
-fno-implicit-templates -I. -I.. -IDownloads/tmp/sage-7.1/local
-IDownloads/tmp/sage-7.1/local/include
-IDownloads/tmp/sage-7.1/local/include
-IDownloads/tmp/sage-7.1/local/include -Dx86_64_Linux -DHAVE_CONFIG_H
-DDL_TAIL=\"sog\" -c mod_raw.cc -o mod_raw.og
mod_raw.cc: In function 'lib_types type_of_LIB(char*, char*)':
mod_raw.cc:41:45: error: narrowing conversion of '254' from 'int' to 'char'
inside { } [-Wnarrowing]
const char mach_o[]={0xfe,0xed,0xfa,0xce,0};
^
mod_raw.cc:41:45: error: narrowing conversion of '237' from 'int' to 'char'
inside { } [-Wnarrowing]
mod_raw.cc:41:45: error: narrowing conversion of '250' from 'int' to 'char'
inside { } [-Wnarrowing]
mod_raw.cc:41:45: error: narrowing conversion of '206' from 'int' to 'char'
inside { } [-Wnarrowing]
mod_raw.cc:42:52: error: narrowing conversion of '206' from 'int' to 'char'
inside { } [-Wnarrowing]
const char mach_o_module[]={0xce,0xfa,0xed,0xfe,0};
^
mod_raw.cc:42:52: error: narrowing conversion of '250' from 'int' to 'char'
inside { } [-Wnarrowing]
mod_raw.cc:42:52: error: narrowing conversion of '237' from 'int' to 'char'
inside { } [-Wnarrowing]
mod_raw.cc:42:52: error: narrowing conversion of '254' from 'int' to 'char'
inside { } [-Wnarrowing]
Makefile:383: recipe for target 'mod_raw.og' failed
So mod_raw.cc is falsely compiled as C++14. The Makefile for the singular
package defines several variables containing flags:
CXXFLAGS = -O2 -g -march=native -O3 -std=gnu++03 -fPIC ${PIPE}
CXXFLAGSG = -g ${PIPE}
CXXFLAGSP = -g -pg -O ${PIPE}
The dialect option is not included in the CXXFLAGSG variable and apparently
it's the one used for compilation.
Setting export SAGE_DEBUG=no had no effect, still the debug version was
compiled.
The same CPPFLAGS variable is used for all targets, but setting it to
'-std=gnu++03' caused configure to fail for that package.
Adjusting the
sage-7.1/local/var/tmp/sage/build/singular-3.1.7p1.p1/src/latest/kernel/Makefile.in"
to be
CXXFLAGSG = @CXXFLAGS@ -g ${PIPE}
did not work, as this file too is being overwritten and patched and it's
hard to see how it's done.
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