3df579626d
bin/lto-dump which may be helpful if you employ link-time optimization (LTO).
Forward port r499061 | gerald | 2019-04-15 from lang/gcc8 and gcc8-devel [1]:
GCC has two runtime libraries: The static library libgcc.a (-lgcc) and
the shared library libgcc_s.so (-lgcc_s). Both implement many of the
same functions but they also each have their unique functions. When
GCC links programs and libraries there are three possibilities:
1. gcc -static-libgcc or gcc -static: -lgcc
=> Just use libgcc.a.
2. gcc -shared-libgcc: -lgcc_s -lgcc
=> Link with libgcc_s first, so libgcc.a is only used for its unique
functions.
3. gcc: -lgcc -Wl,--as-needed -lgcc_s -Wl,--no-as-needed
=> Link with libgcc.a first so libgcc_s is only used for its unique
functions (_Unwind_* functions).
Approach 3 is the default for gcc and it's also what clang and clang++ use;
approach 2 is the default for gfortran, g++ and probably other front ends.
This patch makes 3 the default for gfortran. It significantly reduces
the use of libgcc_s. The _Unwind_* functions are also available in the
old base system libgcc_s which means this reduces the need for
-rpath /usr/local/lib/gccN in ports that depend on libraries built with
gfortran. Consider a dependency tree like this:
prog -> libA -> libgcc_s (old base system libgcc_s is fine)
-> libB -> libgcc_s (libB built with gfortran, needs new libgcc_s)
Here prog needs to be linked with -rpath /usr/local/lib/gccN even if it's
a normal C program compiled with clang. Without -rpath it will fail to
start because it loads old libgcc_s first as a dependency of libA and then
it fails to load libB. With this patch libB works with old base system
libgcc_s or may not need libgcc_s at all, so prog does not need to be
linked with -rpath.
PR: 208120 [1]
Submitted by: tijl [1]
34 lines
1.1 KiB
Text
34 lines
1.1 KiB
Text
bin/%%GNU_HOST%%-c++%%SUFFIX%%
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bin/%%GNU_HOST%%-g++%%SUFFIX%%
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bin/%%GNU_HOST%%-gcc%%SUFFIX%%
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bin/%%GNU_HOST%%-gcc-%%GCC_VERSION%%
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bin/%%GNU_HOST%%-gcc-ar%%SUFFIX%%
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bin/%%GNU_HOST%%-gcc-nm%%SUFFIX%%
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bin/%%GNU_HOST%%-gcc-ranlib%%SUFFIX%%
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bin/%%GNU_HOST%%-gfortran%%SUFFIX%%
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bin/c++%%SUFFIX%%
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bin/cpp%%SUFFIX%%
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bin/g++%%SUFFIX%%
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bin/gcc%%SUFFIX%%
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bin/gcc-ar%%SUFFIX%%
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bin/gcc-nm%%SUFFIX%%
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bin/gcc-ranlib%%SUFFIX%%
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bin/gcov%%SUFFIX%%
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bin/gcov-dump%%SUFFIX%%
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bin/gcov-tool%%SUFFIX%%
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bin/gfortran%%SUFFIX%%
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bin/lto-dump%%SUFFIX%%
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man/man1/cpp%%SUFFIX%%.1.gz
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man/man1/g++%%SUFFIX%%.1.gz
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man/man1/gcc%%SUFFIX%%.1.gz
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man/man1/gcov%%SUFFIX%%.1.gz
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man/man1/gcov-dump%%SUFFIX%%.1.gz
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man/man1/gcov-tool%%SUFFIX%%.1.gz
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man/man1/gfortran%%SUFFIX%%.1.gz
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share/gcc-%%GCC_VERSION%%/python/libstdcxx/__init__.py
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share/gcc-%%GCC_VERSION%%/python/libstdcxx/v6/__init__.py
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share/gcc-%%GCC_VERSION%%/python/libstdcxx/v6/printers.py
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share/gcc-%%GCC_VERSION%%/python/libstdcxx/v6/xmethods.py
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@postexec if type ccache-update-links >/dev/null 2>&1; then ccache-update-links -v; fi
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@postunexec if type ccache-update-links >/dev/null 2>&1; then ccache-update-links -v; fi
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@comment Insert PLIST.lib here
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