On 13.06.22 23:32, Thomas Munro wrote:
Hrmph, I changed my CC to "ccache gcc-mp-11" (what MacPorts calls GCC 11), and I still can't reproduce the problem. I still get "(from executable)". In your original quote you showed "gcc", not "gcc-11", which (assuming it is found as /usr/bin/gcc) is just a little binary that redirects to clang... trying that, this time without ccache in the mix... and still no cigar. So something is different about GCC 11 from homebrew, or the linker invocation it produces under the covers, or the linker it's using?
The original quote said "gcc" but that just me attempting to simplify. I have now also figured out that it works with gcc-10 but not with gcc-11 and gcc-12. For example, below are the underlying linker invocations from gcc-10 and gcc-11. Note that some of the options are ordered quite differently. I don't know what all of that means yet, but it surely points to something in gcc or its packaging being the cause.
However, I think ultimately the use of -lc is an error and we should get rid of it. This episode shows that it's very fragile in any case.
"/usr/local/Cellar/gcc@10/10.3.0/libexec/gcc/x86_64-apple-darwin20/10.3.0/collect2" -dynamic -arch x86_64 -bundle -bundle_loader ../../../src/backend/postgres -macosx_version_min 11.4.0 -multiply_defined suppress -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk -weak_reference_mismatches non-weak -o pltcl.so -L../../../src/port -L../../../src/common -L/usr/local/lib -L/usr/local/opt/openldap/lib "-L/usr/local/opt/openssl@1.1/lib" -L/usr/local/opt/readline/lib -L/usr/local/opt/krb5/lib -L/usr/local/opt/icu4c/lib -L/usr/local/opt/tcl-tk/lib -L/usr/local/Cellar/libxml2/2.9.14/lib -L/usr/local/Cellar/lz4/1.9.3/lib -L/usr/local/Cellar/zstd/1.5.2/lib -L/usr/local/Cellar/tcl-tk/8.6.12_1/lib "-L/usr/local/Cellar/gcc@10/10.3.0/lib/gcc/10/gcc/x86_64-apple-darwin20/10.3.0" "-L/usr/local/Cellar/gcc@10/10.3.0/lib/gcc/10/gcc/x86_64-apple-darwin20/10.3.0/../../.." pltcl.o -dead_strip_dylibs -ltcl8.6 -lz -framework CoreFoundation -lc -lSystem -lgcc_ext.10.5 -lgcc -lSystem -no_compact_unwind -idsym
/usr/local/Cellar/gcc/11.3.0_1/bin/../libexec/gcc/x86_64-apple-darwin21/11/collect2 -dynamic -arch x86_64 -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk -macosx_version_min 12.4.0 -o pltcl.so -L../../../src/port -L../../../src/common -L/usr/local/lib -L/usr/local/opt/openldap/lib "-L/usr/local/opt/openssl@1.1/lib" -L/usr/local/opt/readline/lib -L/usr/local/opt/krb5/lib -L/usr/local/opt/icu4c/lib -L/usr/local/opt/tcl-tk/lib -L/usr/local/Cellar/libxml2/2.9.14/lib -L/usr/local/Cellar/lz4/1.9.3/lib -L/usr/local/Cellar/zstd/1.5.2/lib -L/usr/local/Cellar/tcl-tk/8.6.12_1/lib -L/usr/local/Cellar/gcc/11.3.0_1/bin/../lib/gcc/11/gcc/x86_64-apple-darwin21/11 -L/usr/local/Cellar/gcc/11.3.0_1/bin/../lib/gcc/11/gcc -L/usr/local/Cellar/gcc/11.3.0_1/bin/../lib/gcc/11/gcc/x86_64-apple-darwin21/11/../../.. pltcl.o -dead_strip_dylibs -ltcl8.6 -lz -lc -bundle_loader ../../../src/backend/postgres -bundle -framework CoreFoundation -multiply_defined suppress -lemutls_w -lgcc -lSystem -no_compact_unwind -idsym
