diff options
Diffstat (limited to 'gcc/f/runtime/libF77/README.netlib')
| -rw-r--r-- | gcc/f/runtime/libF77/README.netlib | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/gcc/f/runtime/libF77/README.netlib b/gcc/f/runtime/libF77/README.netlib new file mode 100644 index 00000000000..76682152551 --- /dev/null +++ b/gcc/f/runtime/libF77/README.netlib @@ -0,0 +1,108 @@ +If your compiler does not recognize ANSI C headers, +compile with KR_headers defined: either add -DKR_headers +to the definition of CFLAGS in the makefile, or insert + +#define KR_headers + +at the top of f2c.h , cabs.c , main.c , and sig_die.c . + +Under MS-DOS, compile s_paus.c with -DMSDOS. + +If you have a really ancient K&R C compiler that does not understand +void, add -Dvoid=int to the definition of CFLAGS in the makefile. + +If you use a C++ compiler, first create a local f2c.h by appending +f2ch.add to the usual f2c.h, e.g., by issuing the command + make f2c.h +which assumes f2c.h is installed in /usr/include . + +If your system lacks onexit() and you are not using an ANSI C +compiler, then you should compile main.c, s_paus.c, s_stop.c, and +sig_die.c with NO_ONEXIT defined. See the comments about onexit in +the makefile. + +If your system has a double drem() function such that drem(a,b) +is the IEEE remainder function (with double a, b), then you may +wish to compile r_mod.c and d_mod.c with IEEE_drem defined. +On some systems, you may also need to compile with -Ddrem=remainder . + +To check for transmission errors, issue the command + make check +This assumes you have the xsum program whose source, xsum.c, +is distributed as part of "all from f2c/src". If you do not +have xsum, you can obtain xsum.c by sending the following E-mail +message to netlib@netlib.bell-labs.com + send xsum.c from f2c/src + +The makefile assumes you have installed f2c.h in a standard +place (and does not cause recompilation when f2c.h is changed); +f2c.h comes with "all from f2c" (the source for f2c) and is +available separately ("f2c.h from f2c"). + +Most of the routines in libF77 are support routines for Fortran +intrinsic functions or for operations that f2c chooses not +to do "in line". There are a few exceptions, summarized below -- +functions and subroutines that appear to your program as ordinary +external Fortran routines. + +1. CALL ABORT prints a message and causes a core dump. + +2. ERF(r) and DERF(d) and the REAL and DOUBLE PRECISION + error functions (with x REAL and d DOUBLE PRECISION); + DERF must be declared DOUBLE PRECISION in your program. + Both ERF and DERF assume your C library provides the + underlying erf() function (which not all systems do). + +3. ERFC(r) and DERFC(d) are the complementary error functions: + ERFC(r) = 1 - ERF(r) and DERFC(d) = 1.d0 - DERFC(d) + (except that their results may be more accurate than + explicitly evaluating the above formulae would give). + Again, ERFC and r are REAL, and DERFC and d are DOUBLE + PRECISION (and must be declared as such in your program), + and ERFC and DERFC rely on your system's erfc(). + +4. CALL GETARG(n,s), where n is an INTEGER and s is a CHARACTER + variable, sets s to the n-th command-line argument (or to + all blanks if there are fewer than n command-line arguments); + CALL GETARG(0,s) sets s to the name of the program (on systems + that support this feature). See IARGC below. + +5. CALL GETENV(name, value), where name and value are of type + CHARACTER, sets value to the environment value, $name, of + name (or to blanks if $name has not been set). + +6. NARGS = IARGC() sets NARGS to the number of command-line + arguments (an INTEGER value). + +7. CALL SIGNAL(n,func), where n is an INTEGER and func is an + EXTERNAL procedure, arranges for func to be invoked when + signal n occurs (on systems where this makes sense). + +8. CALL SYSTEM(cmd), where cmd is of type CHARACTER, passes + cmd to the system's command processor (on systems where + this can be done). + +The makefile does not attempt to compile pow_qq.c, qbitbits.c, +and qbitshft.c, which are meant for use with INTEGER*8. To use +INTEGER*8, you must modify f2c.h to declare longint and ulongint +appropriately; then add pow_qq.o to the POW = line in the makefile, +and add " qbitbits.o qbitshft.o" to the makefile's F90BIT = line. + +Following Fortran 90, s_cat.c and s_copy.c allow the target of a +(character string) assignment to be appear on its right-hand, at +the cost of some extra overhead for all run-time concatenations. +If you prefer the extra efficiency that comes with the Fortran 77 +requirement that the left-hand side of a character assignment not +be involved in the right-hand side, compile s_cat.c and s_copy.c +with -DNO_OVERWRITE . + +If your system lacks a ranlib command, you don't need it. +Either comment out the makefile's ranlib invocation, or install +a harmless "ranlib" command somewhere in your PATH, such as the +one-line shell script + + exit 0 + +or (on some systems) + + exec /usr/bin/ar lts $1 >/dev/null |