C++ support?

[Karl Berry]

I asked Nelson to try compiling hello on his array of systems, which he
graciously did.  It basically went fine, and then he went further and tried
compiling it with C++ compilers.  The hello code itself is so simple it
is no problem, but there are a variety of syntax errors in various
gnulib modules with C++, included below.

Is supporting compilation with C++ of interest?  (I'm not arguing for
it, just reporting it, since Nelson went to the trouble of trying it.)

Best,
Karl


Date: Tue, 24 Oct 2006 06:09:35 -0600 (MDT)
From: "Nelson H. F. Beebe" <address@hidden>

[...]

Here is a sprinkling of the kinds of errors C++ compilers reported
about hello-2.1.94 on just one mchine; I suspect all of them are
trivial to fix:

Machinetype:            Sun W40z (4 CPUs, 2400 MHz AMD64 Opteron, 8GB RAM); 
GNU/Linux Red Hat Enterprise Linux AS 4
Configure environment:  CC=g++ CXX=g++ CFLAGS="-pedantic -Wall -W -Wfloat-equal 
-Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings 
-Wredundant-decls -Winline -O3" CXXFLAGS="-pedantic -Wall -W -Wfloat-equal 
-Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings 
-Wredundant-decls -Winline -O3" LDFLAGS="-L/usr/local/lib64 
-Wl,-rpath,/usr/local/lib64"

g++ -DHAVE_CONFIG_H -I. -I../..  -I../../intl   -pedantic -Wall -W 
-Wfloat-equal -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings 
-Wredundant-decls -Winline -O3 -c xalloc-die.c
In file included from xalloc-die.c:31:
gettext.h: In function `const char* dcpgettext_expr(const char*, const char*,
   const char*, int)':
gettext.h:172: error: ISO C++ forbids variable-size array `msg_ctxt_id'
gettext.h: In function `const char* dcnpgettext_expr(const char*, const char*,
   const char*, const char*, long unsigned int, int)':
gettext.h:218: error: ISO C++ forbids variable-size array `msg_ctxt_id'

Configure environment:  CC=icc CFLAGS="-Kc++ -I/usr/local/include" CXX=icc 
CXXFLAGS="-Kc++ -I/usr/local/include" LDFLAGS="-L/usr/local/lib64 
-Wl,-rpath,/opt/intel/cce/9.1.020/lib:/usr/local/lib64" 
LD_LIBRARY_PATH=/opt/intel/cce/9.1.020/lib:/usr/local/lib64:/usr/lib64:/lib64 
FC=ifort F77=ifort

icc -DHAVE_CONFIG_H -I. -I../..  -I../../intl   -Kc++ -I/usr/local/include -c 
quotearg.c
quotearg.c(125): error: a value of type "void *" cannot be used to initialize 
an entity of type "quoting_options *"
    struct quoting_options *p = xmalloc (sizeof *p);
                                ^

quotearg.c(557): error: a value of type "void *" cannot be used to initialize 
an entity of type "char *"
    char *buf = xmalloc (bufsize);
                ^

quotearg.c(607): error: a value of type "void *" cannot be assigned to an 
entity of type "slotvec *"
          slotvec = xmalloc (sizeof *slotvec);
                  ^

quotearg.c(610): error: a value of type "void *" cannot be assigned to an 
entity of type "slotvec *"
        slotvec = xrealloc (slotvec, n1 * sizeof *slotvec);
                ^

quotearg.c(625): error: a value of type "void *" cannot be assigned to an 
entity of type "char *"
        slotvec[n].val = val = xmalloc (size);
                             ^

Configure environment:  CC=pathCC CFLAGS="-I/usr/local/include" CXX=pathCC 
CXXFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib64 
-Wl,-rpath,/usr/local/lib64 -L/opt/pscale/2.5/lib/2.5 
-Wl,-rpath,/opt/pscale/2.5/lib/2.5" FC=pathf90 F77=pathf90

pathCC -DHAVE_CONFIG_H -I. -I../..  -I../../intl   -I/usr/local/include -c 
quotearg.c
quotearg.c: In function `quoting_options*
   clone_quoting_options(quoting_options*)':
quotearg.c:125: error: invalid conversion from `void*' to `quoting_options*'
quotearg.c: In function `char* quotearg_alloc(const char*, long unsigned int,
   const quoting_options*)':
quotearg.c:557: error: invalid conversion from `void*' to `char*'
quotearg.c: In function `char* quotearg_n_options(int, const char*, long
   unsigned int, const quoting_options*)':
quotearg.c:607: error: invalid conversion from `void*' to `
   quotearg_n_options(int, const char*, long unsigned int, const
   quoting_options*)::slotvec*'
quotearg.c:610: error: invalid conversion from `void*' to `
   quotearg_n_options(int, const char*, long unsigned int, const
   quoting_options*)::slotvec*'
quotearg.c:625: error: invalid conversion from `void*' to `char*'

Configure environment:  CC=pgCC CXX=pgCC FC=pgf77 F77=pgf77 
LDFLAGS="-L/usr/local/lib64 -R/usr/local/lib64"

pgCC -DHAVE_CONFIG_H -I. -I../..  -I../../intl   -g -c xalloc-die.c
"gettext.h", line 172: error: expression must have a constant value
    char msg_ctxt_id[msgctxt_len + msgid_len];
                     ^

"gettext.h", line 172: error: expression must have a constant value
    char msg_ctxt_id[msgctxt_len + msgid_len];
                                   ^

"gettext.h", line 218: error: expression must have a constant value
    char msg_ctxt_id[msgctxt_len + msgid_len];
                     ^

"gettext.h", line 218: error: expression must have a constant value
    char msg_ctxt_id[msgctxt_len + msgid_len];
                                   ^

4 errors detected in the compilation of "xalloc-die.c".

Configure environment:  CC=sunCC CXX=sunCC CFLAGS=-xarch=amd64  
CXXFLAGS=-xarch=amd64  LDFLAGS="-L/usr/local/lib64 -R/usr/local/lib64"

sunCC -DHAVE_CONFIG_H -I. -I../..  -I../../intl   -xarch=amd64 -c xalloc-die.c
"gettext.h", line 172: Error: An integer constant expression is required within 
the array subscript operator.
"gettext.h", line 218: Error: An integer constant expression is required within 
the array subscript operator.
2 Error(s) detected.