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Fix rename-dynamic-symbols.sh test (issue NixOS#503)
when building and then checking patchelf on openSUSE Leap 15.5, the rename-dynamic-symbols.sh test fails. The test builds a test library and executable called many-syms-main, then runs patchelf to rename symbols and then checks that many-syms-main still runs successfully. On Leap the run fails with many messages like ./many-syms-main: Symbol `f1947' causes overflow in R_X86_64_PC32 relocation and then terminates with a Segmentation fault. The interesting bit is that it however fails so even before patchelf touches it. The binary is built and linked with option -pie which produces an executable which is supposedly position independent but does not actually contain code position independent code which requires compiler option -fPIE (of -fpie or -fPIC or -fpic). As a result the calls in the generated assembly do not go through the PLT. This patch merely adresses that by adding the -fPIE option to the CFLAGS for the test.
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