Fortran Compiler Hangs

[Tobias Burnus]

Hello Iyer,

Iyer, Balaji V wrote:
> The fortran compiler  (f951) seem to hang even for a simple hello world program in GCC. This is causing the whole gcc build process to hang at the following line:
>
> checking for x86_64-unknown-linux-gnu-gfortran... /export/users/gcc-svn/b-cilkplus-gcc/./gcc/gfortran

First question: Do you use the trunk or some branch? From your email, 
I'd assume that you use the trunk, but "b-cilkplus-gcc" rather implies 
that you are using some branch.


Looking at the backtrace, it seems as if your GMP (GNU Multiprecision 
[integer] Library) and/or MPFR (multi-precision floating-point library) 
is not correctly working, e.g. you might use a different library version 
at run time than you compiled against. The problem could be either f951 
-> MPFR or MFPR -> GMP. Or it could be something different. In any case, 
the failure happens very early in the f951 when the some variables are 
initialized - which is before the parser even has started.

Tobias

> I tried a small hello world program and it was also hanging. I tried to gdb it and here is the backtrace. My current revision is at r198424. My previous revision was at r198143 and I believe things were working fine there.
>
> Here is the test program:
>
>         PRINT *, 'Hello, world!'
>         END
>
> Here is the back trace:
> (gdb) bt
> #0  0x0000000000ece7f1 in __gmpn_mul_1 ()
> #1  0x0000000000ed540b in __gmpn_mul_basecase ()
> #2  0x0000000000ed3c2f in __gmpn_kara_mul_n ()
> #3  0x0000000000ed40df in __gmpn_kara_mul_n ()
> #4  0x0000000000ed4bd5 in __gmpn_toom3_mul_n ()
> #5  0x0000000000ed52ac in __gmpn_mul_n ()
> #6  0x0000000000ed011f in __gmpn_mul ()
> #7  0x0000000000edd4e4 in __gmpn_toom22_mul ()
> #8  0x0000000000eded73 in __gmpn_toom32_mul ()
> #9  0x0000000000ed0080 in __gmpn_mul ()
> #10 0x0000000000ec9cd3 in __gmpz_mul ()
> #11 0x0000000000ea2fb1 in S ()
> #12 0x0000000000ea2f95 in S ()
> #13 0x0000000000ea2f6b in S ()
> #14 0x0000000000ea2f95 in S ()
> #15 0x0000000000ea2f6b in S ()
> #16 0x0000000000ea2f6b in S ()
> #17 0x0000000000ea2f95 in S ()
> #18 0x0000000000ea2f6b in S ()
> #19 0x0000000000ea2f6b in S ()
> #20 0x0000000000ea326b in mpfr_const_log2_internal ()
> #21 0x0000000000eb98af in mpfr_cache ()
> #22 0x0000000000ea36eb in mpfr_log ()
> #23 0x0000000000eb3165 in mpfr_log10 ()
> #24 0x000000000051d2af in gfc_arith_init_1() ()
> #25 0x0000000000576463 in gfc_init_1() ()
> #26 0x00000000005c5bb3 in gfc_init() ()
> #27 0x000000000097d8b7 in toplev_main(int, char**) ()
> #28 0x00007ffff7644bc6 in __libc_start_main () from /lib64/libc.so.6
> #29 0x000000000051bb41 in _start () at ../sysdeps/x86_64/elf/start.S:113