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Stop the linker folding main() into a skipped test #1226

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Merged
philljj merged 1 commit into from
Sep 3, 2026
Merged

Stop the linker folding main() into a skipped test #1226

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9 changes: 9 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -388,6 +388,15 @@ AM_CONDITIONAL([BUILD_KEYBOARD_INTERACTIVE],[test "x$ENABLED_KEYBOARD_INTERACTIV

AX_HARDEN_CC_COMPILER_FLAGS

dnl A test that is configured out compiles down to "return 77", the automake
dnl skip code, and so does the main() that forwards to it. Apple's linker folds
dnl the two identical bodies together, then writes LC_MAIN entryoff 0, so the
dnl binary starts executing at the Mach-O header and dies with SIGILL instead
dnl of skipping. Turn the folding off where the linker understands the flag;
dnl GNU ld rejects it and is unaffected.
AX_CHECK_LINK_FLAG([-Wl,-no_deduplicate],
[AM_LDFLAGS="$AM_LDFLAGS -Wl,-no_deduplicate"])

CREATE_HEX_VERSION
AC_SUBST([AM_CPPFLAGS])
AC_SUBST([AM_CFLAGS])
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