From c1642e5a43de3affa75d52c3577ee1be4c874a5d Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Fri, 13 Mar 2026 01:07:17 +0100
Subject: Fixes compilation with clang and -D_FORTIFY_SOURCE=2

This commit fixes the typo pass_object_size__ for pass_object_size. It also
adds tests in the CI to prevent this from happening again.

Ref https://clang.llvm.org/docs/AttributeReference.html#pass-object-size-pass-dynamic-object-size

Co-Authored-By: Sertonix
---
 .github/workflows/testsuite.yaml | 27 +++++++++++++++++++++++++++
 include/fortify-headers.h        |  2 +-
 tests/Makefile                   |  4 +++-
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/testsuite.yaml b/.github/workflows/testsuite.yaml
index 8de273c..3185f0c 100644
--- a/.github/workflows/testsuite.yaml
+++ b/.github/workflows/testsuite.yaml
@@ -104,3 +104,30 @@ jobs:
       - name: Building with gcc
         shell: bash
         run: CFLAGS=-std=${{ matrix.version }} make -C tests clean gcc run
+
+  fortify_level:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        level: [2, 3]
+    steps:
+      - name: Checking out the code
+        uses: actions/checkout@v3
+      - name: Cache musl toolchain
+        uses: actions/cache@v3
+        id: cache-musl
+        with:
+          path: x86_64-linux-musl-native
+          key: musl
+      - name: Downloading musl-based toolchain
+        if: steps.cache-musl.outputs.cache-hit != 'true'
+        run: wget --quiet https://dustri.org/x86_64-linux-musl-native.tgz
+      - name: Extracting musl-based toolchain
+        if: steps.cache-musl.outputs.cache-hit != 'true'
+        run: tar xzf ./x86_64-linux-musl-native.tgz
+      - name: Building with clang
+        shell: bash
+        run: _FORTIFY_SOURCE=${{ matrix.level }} make -C tests clean clang
+      - name: Building with gcc
+        shell: bash
+        run: _FORTIFY_SOURCE=${{ matrix.level }} make -C tests clean gcc
diff --git a/include/fortify-headers.h b/include/fortify-headers.h
index c32d5fb..3dc33b7 100644
--- a/include/fortify-headers.h
+++ b/include/fortify-headers.h
@@ -23,7 +23,7 @@
 #define _FORTIFY_POSN(n) const __attribute__((pass_dynamic_object_size(n)))
 #else
 /* clang uses overloads; see https://github.com/llvm/llvm-project/issues/53516 */
-#define _FORTIFY_POSN(n) const __attribute__((pass_object_size__(n)))
+#define _FORTIFY_POSN(n) const __attribute__((pass_object_size(n)))
 #endif
 
 /* we can't use extern inline with overloads without making them external */
diff --git a/tests/Makefile b/tests/Makefile
index b71c004..f2428f8 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,7 +1,9 @@
 MACHINE := $(shell uname -m)
+_FORTIFY_SOURCE ?= 3
 CFLAGS ?= -std=gnu99
-CFLAGS += -I../include/ -D_FORTIFY_SOURCE=3 -static -O2 -Wall -Wextra -Werror -Werror=pointer-arith
+CFLAGS += -I../include/ -D_FORTIFY_SOURCE=$(_FORTIFY_SOURCE) -static -O2 -Wall -Wextra -Werror -Werror=pointer-arith
 CFLAGS += -Wno-format -Wno-array-bounds -Wno-shift-count-negative -Wno-unused-variable -Wno-unused-parameter
+CXXFLAGS += -D_FORTIFY_SOURCE=$(_FORTIFY_SOURCE)
 
 RUNTIME_TARGETS= \
 	test_FD_CLR_SETSIZE           \
-- 
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