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qmake: Don't error out if QMAKE_DEFAULT_LIBDIRS is empty on macOS
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The new linker in Xcode 15 doesn't provide any default linker or
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framework paths when requested via -v, but still seems to use the
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default paths documented in the ld man page.
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We trust that linker will do the right thing, even if we don't
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know of its default linker paths.
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We also need to opt out of the default fallback logic to
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set the libdirs to /lib and /usr/lib.
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This may result in UnixMakefileGenerator::findLibraries finding
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different libraries than expected, if additional paths are
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passed with -L, which will then take precedence for qmake,
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even if the linker itself will use the library from the
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SDK's default paths. This should hopefully not be an issue
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in practice, as we don't turn -lFoo into absolute paths in
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qmake, so the only risk is that we're picking up the wrong
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prl files and adding additional dependencies that the lib
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in the SDK doesn't have.
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Upstream commits:
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- Qt 5.15.16: Not yet publicly available.
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- Qt dev: cdf64b0e47115cc473e1afd1472b4b09e130b2a5
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For other Qt branches see
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https://codereview.qt-project.org/q/I2347b26e2df0828471373b0e15b8c9089274c65d
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--- old/qtbase/mkspecs/features/toolchain.prf
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+++ new/qtbase/mkspecs/features/toolchain.prf
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@@ -288,9 +288,12 @@ isEmpty($${target_prefix}.INCDIRS) {
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}
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}
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}
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- isEmpty(QMAKE_DEFAULT_LIBDIRS)|isEmpty(QMAKE_DEFAULT_INCDIRS): \
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+ isEmpty(QMAKE_DEFAULT_INCDIRS): \
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!integrity: \
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- error("failed to parse default search paths from compiler output")
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+ error("failed to parse default include paths from compiler output")
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+ isEmpty(QMAKE_DEFAULT_LIBDIRS): \
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+ !integrity:!darwin: \
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+ error("failed to parse default library paths from compiler output")
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QMAKE_DEFAULT_LIBDIRS = $$unique(QMAKE_DEFAULT_LIBDIRS)
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} else: ghs {
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cmd = $$QMAKE_CXX $$QMAKE_CXXFLAGS -$${LITERAL_HASH} -o /tmp/fake_output /tmp/fake_input.cpp
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@@ -412,7 +415,7 @@ isEmpty($${target_prefix}.INCDIRS) {
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QMAKE_DEFAULT_INCDIRS = $$split(INCLUDE, $$QMAKE_DIRLIST_SEP)
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}
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- unix:if(!cross_compile|host_build) {
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+ unix:!darwin:if(!cross_compile|host_build) {
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isEmpty(QMAKE_DEFAULT_INCDIRS): QMAKE_DEFAULT_INCDIRS = /usr/include /usr/local/include
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isEmpty(QMAKE_DEFAULT_LIBDIRS): QMAKE_DEFAULT_LIBDIRS = /lib /usr/lib
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}
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