61 lines
2.0 KiB
Diff
61 lines
2.0 KiB
Diff
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Mostly equivalent to this upstream commit:
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commit 601113f8a57c8f195af09bb2f14123449fa6bded
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Author: Sam James <sam@gentoo.org>
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Date: Fri Nov 18 00:04:53 2022 +0000
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Fix configure.ac compatibility with Clang 16
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Clang 16 makes -Wimplicit-function-declaration and -Wimplicit-int errors by default.
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Unfortunately, this can lead to misconfiguration or miscompilation of software as configure
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tests may then return the wrong result.
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We also fix -Wstrict-prototypes while here as it's easy to do and it prepares
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us for C23.
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For more information, see LWN.net [0] or LLVM's Discourse [1], the Gentoo wiki [2],
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or the (new) c-std-porting mailing list [3].
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[0] https://lwn.net/Articles/913505/
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[1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213
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[2] https://wiki.gentoo.org/wiki/Modern_C_porting
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[3] hosted at lists.linux.dev.
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Bug: https://bugs.gentoo.org/881707
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Signed-off-by: Sam James <sam@gentoo.org>
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diff --git a/configure.ac b/configure.ac
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index 144d55a9146548c0..e74911535ddd015f 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -279,7 +279,10 @@ AC_CHECK_FUNCS(fcntl ftruncate posix_fadvise asprintf snprintf \
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AC_CACHE_CHECK([for open/O_NOATIME], db_cv_open_o_noatime, [
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echo "test for working open/O_NOATIME" > __o_noatime_file
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AC_TRY_RUN([
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+#include <stdlib.h>
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#include <sys/types.h>
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+#include <sys/stat.h>
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+#include <unistd.h>
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#include <fcntl.h>
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#ifndef O_NOATIME
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#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
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@@ -288,12 +291,15 @@ AC_TRY_RUN([
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#define O_NOATIME 0
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#endif
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#endif
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-main() {
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+int main() {
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int c, fd = open("__o_noatime_file", O_RDONLY | O_NOATIME, 0);
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exit ((!O_NOATIME) || (fd == -1) || (read(fd, &c, 1) != 1));
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}], [db_cv_open_o_noatime=yes], [db_cv_open_o_noatime=no],
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AC_TRY_LINK([
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-#include <sys/types.h>
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+#include <stdlib.h>
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+#include <sys/types.h>
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+#include <sys/stat.h>
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+#include <unistd.h>
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#include <fcntl.h>
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#ifndef O_NOATIME
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#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
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