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Suppress GCC's false -Warray-bounds error in set_parents() with JSON_DIAGNOSTICS

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With JSON_DIAGNOSTICS, GCC 13 to 15 report a false -Warray-bounds error
at -O3 when set_parents() is inlined right after a non-container value
(e.g., a string) was created: the std::map access in the object branch
is checked against the string allocation although m_type rules that
branch out. GCC 15 fixed the pattern from #4819 but not this one.

Suppress -Warray-bounds around set_parents() only, and add a regression
test that is compiled with -O3 -Werror=array-bounds on GCC.

Fixes #5742

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-01 07:51:39 +02:00
1 parent bc1d9d11f4
commit 6b8d2f3d92
4 files changed
+105
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tests/CMakeLists.txt
+5
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@@ -139,6 +139,11 @@ json_test_set_test_options(test-unicode4 TEST_PROPERTIES TIMEOUT 3000)
# only the #972 regression test needs thirdparty/fifo_map on its include path
json_test_set_test_options(test-regression1 LINK_LIBRARIES fifo_map_include)
# GCC's false -Warray-bounds error with JSON_DIAGNOSTICS only shows up when optimizing (#5742)
json_test_set_test_options(test-diagnostics-optimized
COMPILE_OPTIONS $<$<CXX_COMPILER_ID:GNU>:-O3 -Werror=array-bounds>
)
#############################################################################
# add unit tests
#############################################################################