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

- 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.
On AIX Version 5.1 and higher, the default POSIX pthreads API is the 1003.1-1996
standard. If you had a program called mytest and you wanted to obtain access to
the functions in the 1003.1-1996 standard POSIX pthreads API on AIX Version 5.1,
you would link with the libpthreads.a library, using something similar to the
following command:
ld -bh:4 -bpT:0x10000000 -bpD:0x20000000 /lib/crt0_r.o mytest.o -lxlf90_r
-lxlf -lxlsmp -lm_r -lm -lc_r -lc -lpthreads -o mytest
The 1003.1-1996 standard is not fully compatible with Draft 7. If you have
programs that require the Draft 7 interface, link your programs with the
libpthreads_compat.a and libxlfpthrds_compat.a libraries (which provide
compatibility support) followed by the libpthreads.a library. For example, if you
have a program called mytest that was written to use the Draft 7 interface, on AIX
Version 5.1, you would use something similar to the following command:
ld -bh:4 -bpT:0x10000000 -bpD:0x20000000 /lib/crt0_r.o mytest.o
-lxlfpthrds_compat -lxlf90_r -lxlf -lxlsmp -lm_r -lm -lc_r -lc
-lpthreads_compat -lpthreads -o mytest
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 SMP Object Files Using the ld Command
To use the ld command to link a 64-bit SMP program, 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, -lxlsmp, -lm, -lc, and -lpthreads, in that order (you only need
-lxlsmp if you compile with the -qsmp option).
- If you use the -qautodbl option, specify some extra libraries that are listed
in the “-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 smpfile1.o and smpfile2.o on AIX 5.1, you
could specify the following:
ld -bh:4 -bpT:0x10000000 -bpD:0x20000000 -b64 /lib/crt0_64.o -lxlf90
-lxlsmp -lm -lc smpfile1.o smpfile2.o
Editing, Compiling, Linking, and Running XL Fortran Programs 43