[Bug c/32040] New: Including a header file inside a function block results compilation error

["suma dot sharma at kpitcummins dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,

I have successfully built SH4-Linux toolchain based on
(binutils-2.17, gcc-4.2-20061205, glibc-2.5) for Renesas SH target.

I am facing problems while executing the following testcase-

 ------------------------------------------------------------------
TESTCASE
function()
{
        #include<stdio.h>
        printf("\nHELLO WORLD");
}

main()
{
        function();
}


-------------------------------------------------------------------------       

PROBLEM
The above testcase gets compiled with '-O0' optimization successfully,
but on compilation with '-O2' optimization option it gives the following
error:-

In file included from
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:833,
from testcase.c:6:
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h: In
function 'function':
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:35:
error: nested function 'vprintf' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:35:
error: static declaration of 'vprintf' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:42:
error: nested function 'getchar' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:42:
error: static declaration of 'getchar' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:446:
error: previous declaration of 'getchar' was here
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:51:
error: nested function 'getc_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:51:
error: static declaration of 'getc_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:458:
error: previous declaration of 'getc_unlocked' was here
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:58:
error: nested function 'getchar_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:58:
error: static declaration of 'getchar_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:459:
error: previous declaration of 'getchar_unlocked' was here
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:67:
error: nested function 'putchar' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:67:
error: static declaration of 'putchar' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:76:
error: nested function 'fputc_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:76:
error: static declaration of 'fputc_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:86:
error: nested function 'putc_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:86:
error: static declaration of 'putc_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:93:
error: nested function 'putchar_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:93:
error: static declaration of 'putchar_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:113:
error: nested function 'feof_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:113:
error: static declaration of 'feof_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:735:
error: previous declaration of 'feof_unlocked' was here
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:120:
error: nested function 'ferror_unlocked' declared 'extern'
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/bits/stdio.h:120:
error: static declaration of 'ferror_unlocked' follows non-static declaration
/usr/share/gnush4_linux_v0701-1/sh4-linux/sys-root/usr/include/stdio.h:736:
error: previous declaration of 'ferror_unlocked' was here

OBSERVATIONS
1. When "stdio.h" is included outside the function, it compiles with '-O0' as 
   well as '-O2' optimization options

2. When compiled with '-O0' but enabling all '-O2' flags, it compiles 
   successfully
   (Command Line)
   gcc -O0 testcase.c -fthread-jumps -fcrossjumping -foptimize-sibling-calls   
   -fcse-follow-jumps  -fcse-skip-blocks -fgcse  -fgcse-lm  
   -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop  
   -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns   
   -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove
-fstrict-aliasing 
   -fdelete-null-pointer-checks -freorder-blocks  -freorder-functions 
   -funit-at-a-time -falign-functions  -falign-jumps -falign-loops 
   -falign-labels -ftree-vrp -ftree-pre  -o all-flags.o -lm   

3. When compiled with '-O2' but disabling all '-O2' flags, it does not compile
   (Command Line)
   sh4-linux-gcc -O2 testcase.c -fno-thread-jumps -fno-crossjumping 
   -fno-optimize-sibling-calls -fno-cse-follow-jumps  -fno-cse-skip-blocks 
   -fno-gcse -fno-gcse-lm -fno-expensive-optimizations -fno-strength-reduce 
   -fno-rerun-cse-after-loop  -fno-rerun-loop-opt -fno-caller-saves 
   -fno-peephole2 -fno-schedule-insns -fno-schedule-insns2
-fno-sched-interblock 
   -fno-sched-spec -fno-regmove -fno-strict-aliasing  
   -fno-delete-null-pointer-checks -fno-reorder-blocks  -fno-reorder-functions  
   -fno-unit-at-a-time -fno-align-functions  -fno-align-jumps -fno-align-loops 
   -fno-align-labels -fno-tree-vrp -fno-tree-pre -o all-flags.o -lm

4. This problem has been observed with
                   sh-linux toolchain (gcc-4.2) 
                   i686-pc-linux toolchain (gcc-4.1.1, Fedora Core 6)
                   i686-pc-linux toolchain (gcc-4.2.0)

Any help on this will be appreciated.

Regards,
Suma Sharma
KPIT Cummins Infosystems Ltd,
Pune (INDIA)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  

Free download of GNU based SH-Linux toolchains for Renesas' SH Series.          

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Visit http://www.kpitgnutools.com for details.                               

Latest versions of KPIT GNU SH-Linux tools were released on April 5, 2007.      

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


-- 
           Summary: Including a header file inside a function block results
                    compilation error
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: suma dot sharma at kpitcummins dot com
 GCC build triplet: i686-pc-linux
  GCC host triplet: sh4-unknown-linux
GCC target triplet: sh4-unknown-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32040