[PATCH] libsanitizer: Avoid implicit function declaration in configure test

[PATCH] libsanitizer: Avoid implicit function declaration in configure test

[Florian Weimer]

libsanitizer/

	* configure.ac (check for necessary platform features):
	Include <unistd.h> for syscall prototype.
	* configure: Regenerate.

---
 libsanitizer/configure    | 5 +++--
 libsanitizer/configure.ac | 3 ++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/libsanitizer/configure b/libsanitizer/configure
index 3a0c47513e7..cb99faf6100 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -12383,7 +12383,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12386 "configure"
+#line 12398 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12489,7 +12489,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 12492 "configure"
+#line 12504 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16072,6 +16072,7 @@ case "$target" in
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <sys/syscall.h>
+#include <unistd.h>
 int
 main ()
 {
diff --git a/libsanitizer/configure.ac b/libsanitizer/configure.ac
index 7f1ef3979c4..ad49f29db7e 100644
--- a/libsanitizer/configure.ac
+++ b/libsanitizer/configure.ac
@@ -161,7 +161,8 @@ case "$target" in
   *-*-linux*)
     # Some old Linux distributions miss required syscalls.
     sanitizer_supported=no
-    AC_TRY_COMPILE([#include <sys/syscall.h>],[
+    AC_TRY_COMPILE([#include <sys/syscall.h>
+#include <unistd.h>],[
       syscall (__NR_gettid);
       syscall (__NR_futex);
       syscall (__NR_exit_group);

base-commit: acdb24166d13d87c374e578d2ad5d58249171930

Re: [PATCH] libsanitizer: Avoid implicit function declaration in configure test

[Jakub Jelinek]

On Tue, Oct 18, 2022 at 11:39:25AM +0200, Florian Weimer via Gcc-patches wrote:
> libsanitizer/
> 
> 	* configure.ac (check for necessary platform features):

I'd use (sanitizer_supported) or (SANITIZER_SUPPORTED) above instead,
that is what is what is being determined by the test.

> 	Include <unistd.h> for syscall prototype.
> 	* configure: Regenerate.

Otherwise LGTM, thanks.

> --- a/libsanitizer/configure.ac
> +++ b/libsanitizer/configure.ac
> @@ -161,7 +161,8 @@ case "$target" in
>    *-*-linux*)
>      # Some old Linux distributions miss required syscalls.
>      sanitizer_supported=no
> -    AC_TRY_COMPILE([#include <sys/syscall.h>],[
> +    AC_TRY_COMPILE([#include <sys/syscall.h>
> +#include <unistd.h>],[
>        syscall (__NR_gettid);
>        syscall (__NR_futex);
>        syscall (__NR_exit_group);
> 
> base-commit: acdb24166d13d87c374e578d2ad5d58249171930

	Jakub