I have an issue. I have defined in C file, read-line.c, a function print, like this:
void history_print(void)
{
/* some stuff */
}
In a C++ file, command.cc, I have the following:
extern "C" void history_print(void);
and then I simply call history_print().
#Use GNU compiler
cc = gcc -g
CC = g++ -g
all: shell
tty-raw-mode.o: tty-raw-mode.c
gcc -c tty-raw-mode.c
read-line.o: read-line.c
gcc -c read-line.c
lex.yy.o: shell.l
lex shell.l
$(cc) -c lex.yy.c
y.tab.o: shell.y
yacc -d shell.y
$(CC) -c y.tab.c
command.o: command.cc
$(CC) -c command.cc
shell: y.tab.o lex.yy.o tty-raw-mode.o read-line.o command.o
$(CC) -o shell lex.yy.o y.tab.o tty-raw-mode.o read-line.o command.o -ll -lgen
I have an issue when it comes to linking, in my Makefile, for the rule output:
Undefined first referenced
symbol in file
history_print command.o
ld: fatal: Symbol referencing errors. No output written to shell
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `shell'
Output of -v option flag for make:
yacc -d shell.y
g++ -g -v -c y.tab.c
Reading specs from /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/specs
Configured with: ../sources/gcc-3.4.6/configure --prefix=/opt/csw/gcc3 --with-local- prefix=/opt/csw --without-gnu-as --with-as=/usr/ccs/bin/as --without-gnu-ld --with-ld=/usr/ccs/bin/ld --enable-threads=posix --enable-shared --enable-multilib --enable-nls --with-included-gettext --with-libiconv-prefix=/opt/csw --with-x --enable- java-awt=xlib --enable-languages=all
Thread model: posix
gcc version 3.4.6
/opt/csw/gcc3/libexec/gcc/sparc-sun-solaris2.8/3.4.6/cc1plus -quiet -v y.tab.c -quiet -dumpbase y.tab.c -mcpu=v7 -auxbase y.tab -g -version -o /var/tmp//ccCi8vXj.s
ignoring nonexistent directory "/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../.. /../../sparc-sun-solaris2.8/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6/sparc- sun-solaris2.8
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6/backward
/opt/csw/include
/opt/csw/gcc3/include
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/include
/usr/include
End of search list.
GNU C++ version 3.4.6 (sparc-sun-solaris2.8)
compiled by GNU C version 3.4.6.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
/usr/ccs/bin/as -V -Qy -s -xarch=v8 -o y.tab.o /var/tmp//ccCi8vXj.s
/usr/ccs/bin/as: SunOS 5.10 118683-05 Patch 04/30/2010
lex shell.l
gcc -g -c lex.yy.c
gcc -c tty-raw-mode.c
gcc -c read-line.c
g++ -g -v -c command.cc
Reading specs from /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/specs
Configured with: ../sources/gcc-3.4.6/configure --prefix=/opt/csw/gcc3 --with-local- prefix=/opt/csw --without-gnu-as --with-as=/usr/ccs/bin/as --without-gnu-ld --with-ld=/usr/ccs/bin/ld --enable-threads=posix --enable-shared --enable-multilib --enable-nls --with-included-gettext --with-libiconv-prefix=/opt/csw --with-x --enable- java-awt=xlib --enable-languages=all
Thread model: posix
gcc version 3.4.6
/opt/csw/gcc3/libexec/gcc/sparc-sun-solaris2.8/3.4.6/cc1plus -quiet -v command.cc -quiet -dumpbase command.cc -mcpu=v7 -auxbase command -g -version -o /var/tmp//cckVWlC7.s
ignoring nonexistent directory "/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../sparc-sun-solaris2.8/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6/sparc-sun-solaris2.8
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../../../include/c++/3.4.6/backward
/opt/csw/include
/opt/csw/gcc3/include
/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/include
/usr/include
End of search list.
GNU C++ version 3.4.6 (sparc-sun-solaris2.8)
compiled by GNU C version 3.4.6.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
/usr/ccs/bin/as -V -Qy -s -xarch=v8 -o command.o /var/tmp//cckVWlC7.s
/usr/ccs/bin/as: SunOS 5.10 118683-05 Patch 04/30/2010
g++ -g -v -o shell lex.yy.o y.tab.o tty-raw-mode.o read-line.o command.o -ll -lgen
Reading specs from /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/specs
Configured with: ../sources/gcc-3.4.6/configure --prefix=/opt/csw/gcc3 --with-local- prefix=/opt/csw --without-gnu-as --with-as=/usr/ccs/bin/as --without-gnu-ld --with-ld=/usr/ccs/bin/ld --enable-threads=posix --enable-shared --enable-multilib --enable-nls --with-included-gettext --with-libiconv-prefix=/opt/csw --with-x --enable- java-awt=xlib --enable-languages=all
Thread model: posix
gcc version 3.4.6
/opt/csw/gcc3/libexec/gcc/sparc-sun-solaris2.8/3.4.6/collect2 -V -R /opt/csw/lib -Y P,/opt/csw/lib:/usr/ccs/lib:/usr/lib -Qy -o shell /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/crt1.o /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/crti.o /usr/ccs/lib/values-Xa.o /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/crtbegin.o -L/opt /csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6 -L/usr/ccs/bin -L/usr/ccs/lib -L/opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/../../.. lex.yy.o y.tab.o tty-raw-mode.o read-line.o command.o -ll -lgen -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc -lc /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/crtend.o /opt/csw/gcc3/lib/gcc/sparc-sun-solaris2.8/3.4.6/crtn.o
ld: Software Generation Utilities - Solaris Link Editors: 5.10-1.497
Undefined first referenced
symbol in file
history_print command.o
ld: fatal: Symbol referencing errors. No output written to shell
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `shell'
I guess the issue is due to linking, and it has to do with the Makefile, but I am not sure how to fix. Could anyone please help me?
Thank you very much, I really appreciate your help.
Jary
Your makefile needs a linking rule rather than the separate compilation rules:
Make already knows how to convert source into object files – you don’t need to retrain it.