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* [gcc r14-1542] libiberty: On Windows, pass a >32k cmdline through a response file.
@ 2023-06-05 8:11 Jonathan Yong
0 siblings, 0 replies; only message in thread
From: Jonathan Yong @ 2023-06-05 8:11 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:180ebb8a24d24fc5b105f2257d6216f6dfde62df
commit r14-1542-g180ebb8a24d24fc5b105f2257d6216f6dfde62df
Author: Costas Argyris <costas.argyris@gmail.com>
Date: Mon May 22 13:55:56 2023 +0100
libiberty: On Windows, pass a >32k cmdline through a response file.
pex-win32.c (win32_spawn): If the command line for CreateProcess
exceeds the 32k Windows limit, try to store it in a temporary
response file and call CreateProcess with @file instead (PR71850).
Signed-off-by: Costas Argyris <costas.argyris@gmail.com>
Signed-off-by: Jonathan Yong <10walls@gmail.com>
libiberty/ChangeLog:
* pex-win32.c (win32_spawn): Check command line length
and generate a response file if necessary.
(spawn_script): Adjust parameters.
(pex_win32_exec_child): Ditto.
Signed-off-by: Jonathan Yong <10walls@gmail.com>
Diff:
---
libiberty/pex-win32.c | 57 +++++++++++++++++++++++++++++++++++++++------------
1 file changed, 44 insertions(+), 13 deletions(-)
diff --git a/libiberty/pex-win32.c b/libiberty/pex-win32.c
index 23c6c190a2c..0fd8b38734c 100644
--- a/libiberty/pex-win32.c
+++ b/libiberty/pex-win32.c
@@ -569,7 +569,8 @@ env_compare (const void *a_ptr, const void *b_ptr)
* target is not actually an executable, such as if it is a shell script. */
static pid_t
-win32_spawn (const char *executable,
+win32_spawn (struct pex_obj *obj,
+ const char *executable,
BOOL search,
char *const *argv,
char *const *env, /* array of strings of the form: VAR=VALUE */
@@ -624,8 +625,37 @@ win32_spawn (const char *executable,
cmdline = argv_to_cmdline (argv);
if (!cmdline)
goto exit;
-
- /* Create the child process. */
+ /* If cmdline is too large, CreateProcess will fail with a bad
+ 'No such file or directory' error. Try passing it through a
+ temporary response file instead. */
+ if (strlen (cmdline) > 32767)
+ {
+ char *response_file = make_temp_file ("");
+ /* Register the file for deletion by pex_free. */
+ ++obj->remove_count;
+ obj->remove = XRESIZEVEC (char *, obj->remove, obj->remove_count);
+ obj->remove[obj->remove_count - 1] = response_file;
+ int fd = pex_win32_open_write (obj, response_file, 0, 0);
+ if (fd == -1)
+ goto exit;
+ FILE *f = pex_win32_fdopenw (obj, fd, 0);
+ /* Don't write argv[0] (program name) to the response file. */
+ if (writeargv (&argv[1], f))
+ {
+ fclose (f);
+ goto exit;
+ }
+ fclose (f); /* Also closes fd and the underlying OS handle. */
+ char *response_arg = concat ("@", response_file, NULL);
+ char *response_argv[3] = {argv[0], response_arg, NULL};
+ free (cmdline);
+ cmdline = argv_to_cmdline (response_argv);
+ free (response_arg);
+ if (!cmdline)
+ goto exit;
+ }
+
+ /* Create the child process. */
if (CreateProcess (full_executable, cmdline,
/*lpProcessAttributes=*/NULL,
/*lpThreadAttributes=*/NULL,
@@ -645,7 +675,7 @@ win32_spawn (const char *executable,
free (env_block);
free (cmdline);
free (full_executable);
-
+
return pid;
}
@@ -653,7 +683,8 @@ win32_spawn (const char *executable,
This function is called as a fallback if win32_spawn fails. */
static pid_t
-spawn_script (const char *executable, char *const *argv,
+spawn_script (struct pex_obj *obj,
+ const char *executable, char *const *argv,
char* const *env,
DWORD dwCreationFlags,
LPSTARTUPINFO si,
@@ -703,20 +734,20 @@ spawn_script (const char *executable, char *const *argv,
executable = strrchr (executable1, '\\') + 1;
if (!executable)
executable = executable1;
- pid = win32_spawn (executable, TRUE, argv, env,
+ pid = win32_spawn (obj, executable, TRUE, argv, env,
dwCreationFlags, si, pi);
#else
if (strchr (executable1, '\\') == NULL)
- pid = win32_spawn (executable1, TRUE, argv, env,
+ pid = win32_spawn (obj, executable1, TRUE, argv, env,
dwCreationFlags, si, pi);
else if (executable1[0] != '\\')
- pid = win32_spawn (executable1, FALSE, argv, env,
+ pid = win32_spawn (obj, executable1, FALSE, argv, env,
dwCreationFlags, si, pi);
else
{
const char *newex = mingw_rootify (executable1);
*avhere = newex;
- pid = win32_spawn (newex, FALSE, argv, env,
+ pid = win32_spawn (obj, newex, FALSE, argv, env,
dwCreationFlags, si, pi);
if (executable1 != newex)
free ((char *) newex);
@@ -726,7 +757,7 @@ spawn_script (const char *executable, char *const *argv,
if (newex != executable1)
{
*avhere = newex;
- pid = win32_spawn (newex, FALSE, argv, env,
+ pid = win32_spawn (obj, newex, FALSE, argv, env,
dwCreationFlags, si, pi);
free ((char *) newex);
}
@@ -745,7 +776,7 @@ spawn_script (const char *executable, char *const *argv,
/* Execute a child. */
static pid_t
-pex_win32_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, int flags,
+pex_win32_exec_child (struct pex_obj *obj, int flags,
const char *executable, char * const * argv,
char* const* env,
int in, int out, int errdes,
@@ -841,10 +872,10 @@ pex_win32_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, int flags,
si.hStdError = stderr_handle;
/* Create the child process. */
- pid = win32_spawn (executable, (flags & PEX_SEARCH) != 0,
+ pid = win32_spawn (obj, executable, (flags & PEX_SEARCH) != 0,
argv, env, dwCreationFlags, &si, &pi);
if (pid == (pid_t) -1)
- pid = spawn_script (executable, argv, env, dwCreationFlags,
+ pid = spawn_script (obj, executable, argv, env, dwCreationFlags,
&si, &pi);
if (pid == (pid_t) -1)
{
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