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kconfig: let 'shell' return enough output for deep path names

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The 'shell' built-in only returns the first 256 bytes of the command's
output. In some cases, 'shell' is used to return a path; by bumping up
the buffer size to 4096 this lets us capture up to PATH_MAX.

The specific case where I ran into this was due to commit 1e860048c5
("gcc-plugins: simplify GCC plugin-dev capability test"). After this
change, we now use `$(shell,$(CC) -print-file-name=plugin)` to return
a path; if the gcc path is particularly long, then the path ends up
truncated at the 256 byte mark, which makes the HAVE_GCC_PLUGINS
depends test always fail.

Signed-off-by: Brenda Streiff <brenda.streiff@ni.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Brenda Streiff 2022-01-28 16:01:28 -06:00 committed by Masahiro Yamada
parent dfd42facf1
commit 8a4c5b2a6d
1 changed files with 1 additions and 1 deletions
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scripts/kconfig/preprocess.c
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@ -141,7 +141,7 @@ static char *do_lineno(int argc, char *argv[])
static char *do_shell(int argc, char *argv[])
{
FILE *p;
char buf[256];
char buf[4096];
char *cmd;
size_t nread;
int i;