Messages in this thread | | | Date | Wed, 1 Feb 2017 10:04:55 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH v3 1/1] x86, relocs: add printf attribute to die() |
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* Nicolas Iooss <nicolas.iooss_linux@m4x.org> wrote:
> Adding such an attribute helps to detect errors in the format string at > build time. After doing this, the compiler complains about such issues: > > arch/x86/tools/relocs.c:460:5: error: format specifies type 'int' > but the argument has type 'Elf64_Xword' (aka 'unsigned long') > [-Werror,-Wformat] > sec->shdr.sh_size); > ^~~~~~~~~~~~~~~~~ > arch/x86/tools/relocs.c:464:5: error: format specifies type 'int' > but the argument has type 'Elf64_Off' (aka 'unsigned long') > [-Werror,-Wformat] > sec->shdr.sh_offset, strerror(errno)); > ^~~~~~~~~~~~~~~~~~~ > > When relocs.c is included by relocs_32.c, sec->shdr.sh_size and > sec->shdr.sh_offset are 32-bit unsigned integers. When the file is > included by relocs_64.c, these expressions are 64-bit unsigned integers. > > Introduce a PRIuELF macro to define the right format to use when > printing sh_size and sh_offset values. > > While at it, constify the format attribute of die(). > > Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org> > --- > I sent the first versions of this patch in September (cf. > https://patchwork.kernel.org/patch/9312665/) but it has not been > applied. > > As commit adee8705d251 ("x86/build: Annotate die() with noreturn to fix > build warning on clang") introduced the noreturn attribute to die(), > this patch now only adds the printf attribute. > > arch/x86/tools/relocs.c | 14 +++++++------- > arch/x86/tools/relocs.h | 3 ++- > arch/x86/tools/relocs_32.c | 3 +++ > arch/x86/tools/relocs_64.c | 3 +++ > arch/x86/tools/relocs_common.c | 2 +- > 5 files changed, 16 insertions(+), 9 deletions(-) > > diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c > index 0c2fae8d929d..4cad603b8d58 100644 > --- a/arch/x86/tools/relocs.c > +++ b/arch/x86/tools/relocs.c > @@ -397,7 +397,7 @@ static void read_shdrs(FILE *fp) > ehdr.e_shnum); > } > if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) { > - die("Seek to %d failed: %s\n", > + die("Seek to %"PRIuELF" failed: %s\n",
Doesn't a simple "%Ld" work as well?
Thanks,
Ingo
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