Link warning - common block mismatch

[pwalkergeoalgorithms]

I have the same common block in several subroutines located in multiple files. I get a link error, viz:

ld:0:0 warning: for symbol _iodev_ tentative definition of size 16 from WRT.o is being replaced by a real definition of size 12 from PINPUT1.o

the common block and variable definitions are

integer*4 in,out

logical*4 pinputerr

common /iodev/ in, out, pinputerr

Why is the linker concerned and how can the code be modified to eliminate this warning? Thanks. P.W.

[Steven_L_Intel1 · Accepted solution]

The linker is telling you that the COMMON is declared with different sizes in different object files, and has even been so kind as to identify them for you. Do you INCLUDE the declarations from a single file or do you repeat the declarations in each file? Apparently in WRT, you have four variables in IODEV.

[pwalkergeoalgorithms]

Quoting - Steve Lionel (Intel)

The linker is telling you that the COMMON is declared with different sizes in different object files, and has even been so kind as to identify them for you. Do you INCLUDE the declarations from a single file or do you repeat the declarations in each file? Apparently in WRT, you have four variables in IODEV.

Thanks - The variable and common definitions were cut and pasted into each routine to ensure uniformity, but I replaced that code with an include - problem persisted. I noted the data statement below which I replaced with explicit run-time inits of "in" and "out", and the problem disappeared. P.W.

data in, out, ind1, ind2, ind3, outd1, outd2, outd3

& / 5, 6, 4, 3, 2, 7, 8, 9 /

[Steven_L_Intel1]

Interesting. COMMON initialization should take place in a BLOCK DATA subprogram.