XL Fortran Enterprise Edition for AIX : User's Guide - IBM

The configuration file /etc/xlf.cfg lists these default libraries and linker options. By
doing a sample compilation with the -# option, you can see exactly how the
compiler would run the linker.
See the AIX Commands Reference for a description of the linker options.
Linking 32–Bit Non-SMP Object Files Using the ld Command
To use the ld command to link non-SMP object files in a 32-bit environment, follow
these guidelines:
v Do not specify the -e flag.
v Do not change the default starting point of the executable output file (__start).
If you use other starting points, your results will be unpredictable.
v Specify the following options and files with the ld command:
– -bh:4, -bpT:0x10000000, -bpD:02x0000000.
– -lxlf before any other libraries or files on the command line if any object files
compiled by XL Fortran Version 2 are being linked.
– The object file that contains the system startup routine:
- crt0.o for a program that was not profiled.
- mcrt0.o for a program that was profiled with the -p option.
- gcrt0.o for a program that was profiled with the -pg option.
- Link with the startup files in /usr/lib.
– Compiler and system libraries:
- -lxlf90, -lm, and -lc in that order.
- If you use the -qautodbl option, specify some extra libraries that are listed
in “-qautodbl Option” on page 134.
- If you use the -qpdf1 compiler option, specify -lxlopt.
- If you use the -qhot=vector suboption, specify -lxlopt.
For example, to link the object files file1.o and file2.o, you could specify the
following:
ld -bh:4 -bpT:0x10000000 -bpD:0x20000000 /lib/crt0.o -lxlf90 -lm -lc
file1.o file2.o
The configuration file /etc/xlf.cfg lists these default libraries and linker options. By
doing a sample compilation with the -# option, you can see exactly how the
compiler would run the linker.
See the AIX Commands Reference for a description of the linker options.
Linking 64-Bit Non-SMP Object Files Using the ld Command
To use the ld command to link non-SMP object files in a 64-bit environment, follow
these guidelines:
v Do not specify the -e flag.
v Do not change the default starting point of the executable output file (__start).
If you use other starting points, your results will be unpredictable.
v Specify the following options and files with the ld command:
– On AIX 5.1, -bh:4, -bpT:0x10000000, -bpD:0x20000000, -b64.
– The object file that contains the system startup routine:
- crt0_64.o for a program that was not profiled.
- mcrt0_64.o for a program that was profiled with the -p option.
- gcrt0_64.o for a program that was profiled with the -pg option.
- Link with the startup files in /usr/lib.
– Compiler and system libraries:
- -lxlf90, -lm, and -lc in that order.
44 XL Fortran Enterprise Edition for AIX : User’s Guide