[Bug 6068] Enhancement: Add warning -Wcast-align for GCC

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6068

--- Comment #6 from Jeffrey Walton <noloader at gmail.com> 2013-03-05 21:46:40 UTC ---
clang -c libc/misc/gnu/obstack.c -o libc/misc/gnu/obstack.os -include
./include/libc-symbols.h -Wall -Wstrict-prototypes -Wstrict-aliasing -Wformat=2
-Wmissing-noreturn -Wmissing-format-attribute -Wmissing-prototypes
-Wmissing-declarations -Wnested-externs -Wnonnull -Wold-style-definition
-Wshadow -Wundef -Wdeclaration-after-statement -funsigned-char -fno-builtin
-fno-asm -std=gnu99 -fno-stack-protector -nostdinc -I./include -I./include -I.
-I./libc/sysdeps/linux -I./libc/sysdeps/linux/x86_64  -Os -funit-at-a-time
-fmerge-all-constants -fstrict-aliasing -Wcast-align -fno-common
-I./libc/sysdeps/linux/common -I/usr/src/linux-headers-3.2.0-38/include/
-isystem /usr/local/bin/../lib/clang/3.1/include-fixed -isystem
/usr/local/bin/../lib/clang/3.1/include -DNDEBUG -fPIC     -MT
libc/misc/gnu/obstack.os -MD -MP -MF libc/misc/gnu/.obstack.os.dep



libc/misc/gnu/obstack.c:301:3: warning: cast from 'char *' to 'int *' increases
      required alignment from 1 to 4 [-Wcast-align]
        ((COPYING_UNIT *)object_base)[i]
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
libc/misc/gnu/obstack.c:302:7: warning: cast from 'char *' to 'int *' increases
      required alignment from 1 to 4 [-Wcast-align]
          = ((COPYING_UNIT *)h->object_base)[i];
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings generated.

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