sys-devel/clang-common: Fix a warning when using -Weverything

This warning is caused by the fortify.h header that has a
system-reserved macro name. This commit simply adds a pragma to tell
Clang that the header is a system header.

I surrounded the pragma with `#ifdef __clang__` and such in case this
header is used for GCC or other compilers, but according to a Gentoo
maintainer, this is not strictly necessary.

I incremented the revision number on 15.0.7-4, 16.0.0, and
17.0.0_pre20230314 but I did not increment them on 16.0.0.999 and
17.0.0.999. I may be wrong, but it doesn't seem like revisions should be
incremented on ebuilds that follow the latest commits of projects.

I thought I had read about that somewhere, but the only source I could
find was [1], and that one did not mention anything about 9999-type
ebuilds and revision numbers.

That said, [2] did have an example where a _pre* ebuild had a revision
number, so I specifically added a revision number to 17.0.0_pre20230314.

Also, [1] said to not add a revision number if the fix is trivial and
would not be worth it with the compile times. However, this package is
trivial to "compile" since it only installs certain files, so I thought
it worth it to increment revisions.

If the Gentoo authors disagree, I don't mind at all, though.

[1]: https://devmanual.gentoo.org/general-concepts/ebuild-revisions/index.html
[2]: https://devmanual.gentoo.org/ebuild-writing/file-format/index.html#file-naming-rules

Signed-off-by: Gavin D. Howard <gavin@gavinhoward.com>
Closes: https://github.com/gentoo/gentoo/pull/30276
Signed-off-by: Michał Górny <mgorny@gentoo.org>

5 files changed, 15 insertions, 0 deletions

diff --git a/sys-devel/clang-common/clang-common-15.0.7-r4.ebuild b/sys-devel/clang-common/clang-common-15.0.7-r5.ebuild
index c7af956a5dd7..8d526d297a03 100644
--- a/sys-devel/clang-common/clang-common-15.0.7-r4.ebuild
+++ b/sys-devel/clang-common/clang-common-15.0.7-r5.ebuild
@@ -107,6 +107,9 @@ src_install() {
 	# without optimization and that would at the very least be very noisy
 	# during builds and at worst trigger many -Werror builds.
 	cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
+	#ifdef __clang__
+	# pragma clang system_header
+	#endif
 	#ifndef _FORTIFY_SOURCE
 	# if defined(__has_feature)
 	#  define __GENTOO_HAS_FEATURE(x) __has_feature(x)
diff --git a/sys-devel/clang-common/clang-common-16.0.0.ebuild b/sys-devel/clang-common/clang-common-16.0.0-r1.ebuild
index 784fa3ae7a88..4acd801b683d 100644
--- a/sys-devel/clang-common/clang-common-16.0.0.ebuild
+++ b/sys-devel/clang-common/clang-common-16.0.0-r1.ebuild
@@ -106,6 +106,9 @@ src_install() {
 	# without optimization and that would at the very least be very noisy
 	# during builds and at worst trigger many -Werror builds.
 	cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
+	#ifdef __clang__
+	# pragma clang system_header
+	#endif
 	#ifndef _FORTIFY_SOURCE
 	# if defined(__has_feature)
 	#  define __GENTOO_HAS_FEATURE(x) __has_feature(x)
diff --git a/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild b/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
index 808c1e1a0ae1..5b4a6647f3ca 100644
--- a/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
+++ b/sys-devel/clang-common/clang-common-16.0.0.9999.ebuild
@@ -106,6 +106,9 @@ src_install() {
 	# without optimization and that would at the very least be very noisy
 	# during builds and at worst trigger many -Werror builds.
 	cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
+	#ifdef __clang__
+	# pragma clang system_header
+	#endif
 	#ifndef _FORTIFY_SOURCE
 	# if defined(__has_feature)
 	#  define __GENTOO_HAS_FEATURE(x) __has_feature(x)
diff --git a/sys-devel/clang-common/clang-common-17.0.0.9999.ebuild b/sys-devel/clang-common/clang-common-17.0.0.9999.ebuild
index 808c1e1a0ae1..5b4a6647f3ca 100644
--- a/sys-devel/clang-common/clang-common-17.0.0.9999.ebuild
+++ b/sys-devel/clang-common/clang-common-17.0.0.9999.ebuild
@@ -106,6 +106,9 @@ src_install() {
 	# without optimization and that would at the very least be very noisy
 	# during builds and at worst trigger many -Werror builds.
 	cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
+	#ifdef __clang__
+	# pragma clang system_header
+	#endif
 	#ifndef _FORTIFY_SOURCE
 	# if defined(__has_feature)
 	#  define __GENTOO_HAS_FEATURE(x) __has_feature(x)
diff --git a/sys-devel/clang-common/clang-common-17.0.0_pre20230314.ebuild b/sys-devel/clang-common/clang-common-17.0.0_pre20230314-r1.ebuild
index 808c1e1a0ae1..5b4a6647f3ca 100644
--- a/sys-devel/clang-common/clang-common-17.0.0_pre20230314.ebuild
+++ b/sys-devel/clang-common/clang-common-17.0.0_pre20230314-r1.ebuild
@@ -106,6 +106,9 @@ src_install() {
 	# without optimization and that would at the very least be very noisy
 	# during builds and at worst trigger many -Werror builds.
 	cat >> "${ED}/usr/include/gentoo/fortify.h" <<- EOF || die
+	#ifdef __clang__
+	# pragma clang system_header
+	#endif
 	#ifndef _FORTIFY_SOURCE
 	# if defined(__has_feature)
 	#  define __GENTOO_HAS_FEATURE(x) __has_feature(x)