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support: Use unwinder in links-dso-program-c only with libgcc_s 

Do not build links-dso-program-c with exception (unwinding) support
if libgcc_s is not available.  In this case, the unwinder may be
part of libgcc.a or libgcc_eh.a, depending on how GCC was built.
If the unwinder is in libgcc_eh.a only, linking links-dso-program-c
failed before this change.  After this change, the exception
handling landing pad is only generated if libgcc_s available,
avoiding an undefined _Unwind_Resume (or equivalent) symbol
reference in the non-libgcc_s case.

Fixes commit ffd36cc27407003a6f9efcb9c16370e3435c5b1d ("support: Use
unwinder in links-dso-program-c only with libgcc_s") and
commit 5dfbc3c43e ("support: Link
links-dso-program-c with libgcc_s only if available").
This commit is contained in:
Florian Weimer 2025-03-26 17:46:40 +01:00
parent 1233da4943
commit be61b9493d
1 changed files with 1 additions and 1 deletions
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support/Makefile
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@ -281,9 +281,9 @@ CFLAGS-temp_file.c += -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64
ifeq (,$(CXX))
LINKS_DSO_PROGRAM = links-dso-program-c
CFLAGS-links-dso-program-c.c += -fexceptions
LDLIBS-links-dso-program-c = -lgcc
ifeq ($(have-libgcc_s),yes)
CFLAGS-links-dso-program-c.c += -fexceptions
LDLIBS-links-dso-program-c += -lgcc_s $(libunwind)
endif
else