linux-kernel - Re: [PATCH 23/43] tools lib: Adopt skip

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Date:   Tue, 2 Jul 2019 14:12:40 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        André Goddard Rosa <andre.goddard@...il.com>
Subject: Re: [PATCH 23/43] tools lib: Adopt skip_spaces() from the kernel
 sources

On Mon, Jul 01, 2019 at 11:25:56PM -0300, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> Same implementation, will be used to replace ad-hoc equivalent code in
> tools/.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: André Goddard Rosa <andre.goddard@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: https://lkml.kernel.org/n/tip-dig691cg9ripvoiprpidthw7@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/include/linux/string.h |  4 +++-
>  tools/lib/string.c           | 14 ++++++++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
> index 6c3e2cc274c5..cee239350a6b 100644
> --- a/tools/include/linux/string.h
> +++ b/tools/include/linux/string.h
> @@ -29,4 +29,6 @@ static inline bool strstarts(const char *str, const char *prefix)
>  	return strncmp(str, prefix, strlen(prefix)) == 0;
>  }
>  
> -#endif /* _LINUX_STRING_H_ */
> +extern char * __must_check skip_spaces(const char *);
> +
> +#endif /* _TOOLS_LINUX_STRING_H_ */
> diff --git a/tools/lib/string.c b/tools/lib/string.c
> index 93b3d4b6feac..50d400822bb3 100644
> --- a/tools/lib/string.c
> +++ b/tools/lib/string.c
> @@ -17,6 +17,7 @@
>  #include <string.h>
>  #include <errno.h>
>  #include <linux/string.h>
> +#include <linux/ctype.h>
>  #include <linux/compiler.h>
>  
>  /**
> @@ -106,3 +107,16 @@ size_t __weak strlcpy(char *dest, const char *src, size_t size)
>  	}
>  	return ret;
>  }
> +
> +/**
> + * skip_spaces - Removes leading whitespace from @str.
> + * @str: The string to be stripped.
> + *
> + * Returns a pointer to the first non-whitespace character in @str.
> + */
> +char *skip_spaces(const char *str)
> +{
> +	while (isspace(*str))
> +		++str;
> +	return (char *)str;
> +}
> -- 
> 2.20.1
> 

this breaks objtool build, because it adds _ctype dependency via isspace call
patch below fixes it for me

jirka


---
diff --git a/tools/objtool/Build b/tools/objtool/Build
index 749becdf5b90..8dc4f0848362 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -9,6 +9,7 @@ objtool-y += special.o
 objtool-y += objtool.o
 
 objtool-y += libstring.o
+objtool-y += libctype.o
 objtool-y += str_error_r.o
 
 CFLAGS += -I$(srctree)/tools/lib
@@ -17,6 +18,10 @@ $(OUTPUT)libstring.o: ../lib/string.c FORCE
 	$(call rule_mkdir)
 	$(call if_changed_dep,cc_o_c)
 
+$(OUTPUT)libctype.o: ../lib/ctype.c FORCE
+	$(call rule_mkdir)
+	$(call if_changed_dep,cc_o_c)
+
 $(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE
 	$(call rule_mkdir)
 	$(call if_changed_dep,cc_o_c)