g77 in Ubuntu Linux

We need to use g77 compiler rather than gfortran on modern Linux distribution. However, g77 is replaced by gfortran in modern gcc package.

According to "build g77 from source" in gfortran.org, we need to build one from older version of gcc: v3.4.6

Our environment is Ubuntu 9.04(jaunty), gcc 4.3.3

※ Install g77

Get "gcc-3.4.6.tar.gz" into a folder, and then key in
tar xvzf gcc-3.4.6.tar.gz
mkdir bin
mkdir run
cd bin
../gcc-3.4.6/configure --enable-languages=c,f77 --disable-checking --prefix=$HOME/g77/run
make CC=/usr/bin/gcc
make install

Then g77 compiler should be $HOME/g77/run/bin/g77


★ However, in this command:
make CC=/usr/bin/gcc
may encounter error message:

In function 「open」,
inlined from 「collect_execute」 at ../../gcc-3.4.6/gcc/collect2.c:1537:
/usr/include/bits/fcntl2.h:51: 錯誤： call to 「__open_missing_mode」 declared with attribute error: open with O_CREAT in second argument needs 3 arguments
make[1]: *** [collect2.o] Error 1
make[1]: Leaving directory `/home/cjclab/g77-3.4.6/bin/gcc'
make: *** [all-gcc] Error 2

solution is changing one line in $HOME/g77/gcc-3.4.6/gcc/collect2.c
from
redir_handle = open (redir.0_WRONLY | 0_TRUNC | 0_CREAT);)
to
redir_handle = open (redir.0_WRONLY | 0_TRUNC | 0_CREAT,0777);)


similar post ref here

※ using g77 to compile

When compiling with g77, you must add -static parameter to avoid link to libg2c0/libg2c.so.0. For example, compile test.f and turn into test.out:
$HOME/g77/run/bin/g77 -static test.f -o test.out

otherwise, you may encounter error message like this:

./test.out: error while loading shared libraries: libg2c.so.0: cannot open shared object file: No such file or directory

p.s. We were tring to compile CNS(Crystallographic/NMR Refinement Software), but actually in CNS version 1.21, binary installation is provided, so no need to compile by ourselves.