[bug #51523] Compilation error with GCC 7.1

[Iru Cai]

URL:
  <http://savannah.gnu.org/bugs/?51523>

                 Summary: Compilation error with GCC 7.1
                 Project: GNU GRUB
            Submitted by: archlinux
            Submitted on: Fri 21 Jul 2017 02:30:02 AM UTC
                Category: Compilation
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

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Details:

The generated grub_script.yy.c has useless statements that make GCC 7.1 give
out warning.


make[3]: Entering directory '/home/irudog/SourceCode/grub/grub-core'
gcc -DHAVE_CONFIG_H -I. -I..  -Wall -W  -DGRUB_MACHINE_COREBOOT=1
-DGRUB_MACHINE=I386_COREBOOT -m32 -nostdinc -isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.1/include -I../include -I../include
-DGRUB_FILE=\"grub_script.yy.c\" -I. -I. -I.. -I.. -I../include -I../include
-I../grub-core/lib/libgcrypt-grub/src/   -I../grub-core/lib/posix_wrap 
-D_FILE_OFFSET_BITS=64 -Os -Wall -W -Wshadow -Wpointer-arith -Wundef
-Wchar-subscripts -Wcomment -Wdeprecated-declarations -Wdisabled-optimization
-Wdiv-by-zero -Wfloat-equal -Wformat-extra-args -Wformat-security -Wformat-y2k
-Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wmain
-Wmissing-braces -Wmissing-format-attribute -Wmultichar -Wparentheses
-Wreturn-type -Wsequence-point -Wshadow -Wsign-compare -Wswitch -Wtrigraphs
-Wunknown-pragmas -Wunused -Wunused-function -Wunused-label -Wunused-parameter
-Wunused-value  -Wunused-variable -Wwrite-strings -Wnested-externs
-Wstrict-prototypes -g -Wredundant-decls -Wmissing-prototypes
-Wmissing-declarations  -Wextra -Wattributes -Wendif-labels -Winit-self
-Wint-to-pointer-cast -Winvalid-pch -Wmissing-field-initializers -Wnonnull
-Woverflow -Wvla -Wpointer-to-int-cast -Wstrict-aliasing -Wvariadic-macros
-Wvolatile-register-var -Wpointer-sign -Wmissing-include-dirs
-Wmissing-prototypes -Wmissing-declarations -Wformat=2 -march=i386 -m32 -mrtd
-mregparm=3 -falign-jumps=1 -falign-loops=1 -falign-functions=1
-freg-struct-return -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow
-msoft-float -fno-dwarf2-cfi-asm -mno-stack-arg-probe
-fno-asynchronous-unwind-tables -fno-unwind-tables -Qn -fno-PIE -fno-pie
-fno-stack-protector -Wtrampolines -Werror   -ffreestanding -fno-builtin
-Wno-redundant-decls   -MT normal_module-grub_script.yy.o -MD -MP -MF
.deps-core/normal_module-grub_script.yy.Tpo -c -o
normal_module-grub_script.yy.o `test -f 'grub_script.yy.c' || echo
'./'`grub_script.yy.c
grub_script.yy.c: In function 'yy_fatal_error':
grub_script.yy.c:18:22: error: statement with no effect
[-Werror=unused-value]
 
                      ^
grub_script.yy.c:2366:2: note: in expansion of macro 'fprintf'
  (void)yyg;
  ^~~~~~~
cc1: all warnings being treated as errors
make[3]: *** [Makefile:36668: normal_module-grub_script.yy.o] Error 1





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