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![Ingo Molnar](/assets/img/avatar_default.png)
Related to a shadowed variable bug fix Valdis Kletnieks noticed that perf does not get built with -Wshadow, which could have helped us avoid the bug. So enable -Wshadow and also enable the following warnings on perf builds, in addition to the already enabled -Wall -Wextra -std=gnu99 warnings: -Wcast-align -Wformat=2 -Wshadow -Winit-self -Wpacked -Wredundant-decls -Wstack-protector -Wstrict-aliasing=3 -Wswitch-default -Wswitch-enum -Wno-system-headers -Wundef -Wvolatile-register-var -Wwrite-strings -Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wstrict-prototypes -Wdeclaration-after-statement And change/fix the perf code to build cleanly under GCC 4.3.2. The list of warnings enablement is rather arbitrary: it's based on my (quick) reading of the GCC manpages and trying them on perf. I categorized the warnings based on individually enabling them and looking whether they trigger something in the perf build. If i liked those warnings (i.e. if they trigger for something that arguably could be improved) i enabled the warning. If the warnings seemed to come from language laywers spamming the build with tons of nuisance warnings i generally kept them off. Most of the sign conversion related warnings were in this category. (A second patch enabling some of the sign warnings might be welcome - sign bugs can be nasty.) I also kept warnings that seem to make sense from their manpage description and which produced no actual warnings on our code base. These warnings might still be turned off if they end up being a nuisance. I also left out a few warnings that are not supported in older compilers. [ Note that these changes might break the build on older compilers i did not test, or on non-x86 architectures that produce different warnings, so more testing would be welcome. ] Reported-by: Valdis.Kletnieks@vt.edu Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
167 lines
3.2 KiB
C
167 lines
3.2 KiB
C
#include "cache.h"
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#include "exec_cmd.h"
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#include "quote.h"
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#include <string.h>
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#define MAX_ARGS 32
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static const char *argv_exec_path;
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static const char *argv0_path;
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const char *system_path(const char *path)
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{
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#ifdef RUNTIME_PREFIX
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static const char *prefix;
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#else
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static const char *prefix = PREFIX;
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#endif
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struct strbuf d = STRBUF_INIT;
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if (is_absolute_path(path))
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return path;
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#ifdef RUNTIME_PREFIX
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assert(argv0_path);
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assert(is_absolute_path(argv0_path));
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if (!prefix &&
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!(prefix = strip_path_suffix(argv0_path, PERF_EXEC_PATH)) &&
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!(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
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!(prefix = strip_path_suffix(argv0_path, "perf"))) {
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prefix = PREFIX;
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fprintf(stderr, "RUNTIME_PREFIX requested, "
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"but prefix computation failed. "
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"Using static fallback '%s'.\n", prefix);
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}
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#endif
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strbuf_addf(&d, "%s/%s", prefix, path);
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path = strbuf_detach(&d, NULL);
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return path;
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}
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const char *perf_extract_argv0_path(const char *argv0)
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{
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const char *slash;
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if (!argv0 || !*argv0)
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return NULL;
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slash = argv0 + strlen(argv0);
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while (argv0 <= slash && !is_dir_sep(*slash))
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slash--;
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if (slash >= argv0) {
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argv0_path = xstrndup(argv0, slash - argv0);
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return slash + 1;
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}
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return argv0;
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}
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void perf_set_argv_exec_path(const char *exec_path)
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{
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argv_exec_path = exec_path;
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/*
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* Propagate this setting to external programs.
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*/
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setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
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}
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/* Returns the highest-priority, location to look for perf programs. */
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const char *perf_exec_path(void)
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{
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const char *env;
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if (argv_exec_path)
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return argv_exec_path;
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env = getenv(EXEC_PATH_ENVIRONMENT);
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if (env && *env) {
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return env;
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}
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return system_path(PERF_EXEC_PATH);
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}
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static void add_path(struct strbuf *out, const char *path)
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{
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if (path && *path) {
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if (is_absolute_path(path))
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strbuf_addstr(out, path);
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else
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strbuf_addstr(out, make_nonrelative_path(path));
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strbuf_addch(out, PATH_SEP);
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}
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}
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void setup_path(void)
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{
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const char *old_path = getenv("PATH");
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struct strbuf new_path = STRBUF_INIT;
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add_path(&new_path, perf_exec_path());
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add_path(&new_path, argv0_path);
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if (old_path)
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strbuf_addstr(&new_path, old_path);
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else
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strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
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setenv("PATH", new_path.buf, 1);
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strbuf_release(&new_path);
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}
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const char **prepare_perf_cmd(const char **argv)
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{
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int argc;
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const char **nargv;
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for (argc = 0; argv[argc]; argc++)
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; /* just counting */
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nargv = malloc(sizeof(*nargv) * (argc + 2));
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nargv[0] = "perf";
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for (argc = 0; argv[argc]; argc++)
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nargv[argc + 1] = argv[argc];
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nargv[argc + 1] = NULL;
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return nargv;
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}
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int execv_perf_cmd(const char **argv) {
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const char **nargv = prepare_perf_cmd(argv);
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/* execvp() can only ever return if it fails */
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execvp("perf", (char **)nargv);
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free(nargv);
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return -1;
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}
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int execl_perf_cmd(const char *cmd,...)
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{
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int argc;
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const char *argv[MAX_ARGS + 1];
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const char *arg;
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va_list param;
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va_start(param, cmd);
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argv[0] = cmd;
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argc = 1;
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while (argc < MAX_ARGS) {
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arg = argv[argc++] = va_arg(param, char *);
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if (!arg)
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break;
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}
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va_end(param);
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if (MAX_ARGS <= argc)
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return error("too many args to run %s", cmd);
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argv[argc] = NULL;
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return execv_perf_cmd(argv);
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}
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