mjklemm wrote:
The above fails with ifort/ifx:
```
[2023-12-01 19:00:56 CET] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)> cat >
ftn.f90
function pow(a, b)
real :: a, b, pow
pow = a ** b
end function
[2023-12-01 19:01:03 CET] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)> !if
[2023-12-01 19:01:04 CET] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)> ifx -o
ftn.o -c ftn.f90 && icc -o prg.o -c prg.c && ifx -o bla prg.o ftn.o
icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is deprecated and
will be removed from product release in the second half of 2023. The Intel(R)
oneAPI DPC++/C++ Compiler (ICX) is the recommended compiler moving forward.
Please transition to use this compiler. Use '-diag-disable=10441' to disable
this message.
ld: prg.o: in function `main':
prg.c:(.text+0x0): multiple definition of `main';
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/compiler/lib/intel64_lin/for_main.o:for_main.c:(.text+0x0):
first defined here
ld:
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/compiler/lib/intel64_lin/for_main.o:
in function `main':
for_main.c:(.text+0x19): undefined reference to `MAIN__'
[2023-12-01 19:01:24 CET] [1] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)>
cat prg.c
int main(void) {
// call fortran code
return 0;
}
[2023-12-01 19:01:27 CET] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)> cat
ftn.f90
function pow(a, b)
real :: a, b, pow
pow = a ** b
end function
[2023-12-01 19:01:31 CET] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)> ifx -o
ftn.o -c ftn.f90 && icc -o prg.o -c prg.c && ifx -o bla prg.o ftn.o
icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is deprecated and
will be removed from product release in the second half of 2023. The Intel(R)
oneAPI DPC++/C++ Compiler (ICX) is the recommended compiler moving forward.
Please transition to use this compiler. Use '-diag-disable=10441' to disable
this message.
ld: prg.o: in function `main':
prg.c:(.text+0x0): multiple definition of `main';
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/compiler/lib/intel64_lin/for_main.o:for_main.c:(.text+0x0):
first defined here
ld:
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/compiler/lib/intel64_lin/for_main.o:
in function `main':
for_main.c:(.text+0x19): undefined reference to `MAIN__'
[2023-12-01 19:01:34 CET] [1] iris ~/tm*/fo*/ftn_main_dupes [0:0] (main *=)>
ifort -o ftn.o -c ftn.f90 && icc -o prg.o -c prg.c && ifort -o bla prg.o ftn.o
icc: remark #10441: The Intel(R) C++ Compiler Classic (ICC) is deprecated and
will be removed from product release in the second half of 2023. The Intel(R)
oneAPI DPC++/C++ Compiler (ICX) is the recommended compiler moving forward.
Please transition to use this compiler. Use '-diag-disable=10441' to disable
this message.
ld: prg.o: in function `main':
prg.c:(.text+0x0): multiple definition of `main';
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/bin/intel64/../../compiler/lib/intel64_lin/for_main.o:for_main.c:(.text+0x0):
first defined here
ld:
/net/software/x86_64/oneapi/compiler/2023.1.0/linux/bin/intel64/../../compiler/lib/intel64_lin/for_main.o:
in function `main':
for_main.c:(.text+0x19): undefined reference to `MAIN__'
```
To get gfortran's behavior one could also use `-Wl,--allow-multiple-definition`
which would then allow the linker to pick the C `main` function and ignore the
`main` function from Fortran_main.a
https://github.com/llvm/llvm-project/pull/74120
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