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author | Iain Sandoe <iain@sandoe.co.uk> | 2022-05-28 11:55:00 +0100 |
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committer | Iain Sandoe <iain@sandoe.co.uk> | 2022-05-28 11:55:00 +0100 |
commit | 65aebf198767fb27a9d29b6383c7c651b0015db0 (patch) | |
tree | 3e9dbd61cb8b25d4d9e05cb6367e1fb54fcad640 /gcc/config/darwin.h | |
parent | 163fa9a6483857f16053c426a001bd9f9fa89ae4 (diff) | |
download | gcc-65aebf198767fb27a9d29b6383c7c651b0015db0.zip gcc-65aebf198767fb27a9d29b6383c7c651b0015db0.tar.gz gcc-65aebf198767fb27a9d29b6383c7c651b0015db0.tar.bz2 |
Darwin: Amend REAL_LIBGCC_SPEC comment [NFC].
This comment had got out of sync with reality, partly due to merging
of patches. Updated to reflect the current implementation.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:
* config/darwin.h (REAL_LIBGCC_SPEC): Update the comment block
describing this macro.
Diffstat (limited to 'gcc/config/darwin.h')
-rw-r--r-- | gcc/config/darwin.h | 38 |
1 files changed, 13 insertions, 25 deletions
diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h index 3682bd2..b73e123 100644 --- a/gcc/config/darwin.h +++ b/gcc/config/darwin.h @@ -465,48 +465,36 @@ extern GTY(()) int darwin_ms_struct; #define LIB_SPEC "%{!static:-lSystem}" -/* - Note that by default, -lgcc_eh is not linked against. - This is because,in general, we need to unwind through system libraries that - are linked with the shared unwinder in libunwind (or libgcc_s for 10.4/5). +/* Note that by default, -lgcc_eh (which provides a statically-linked unwinder) + is not used. This is because, in general, we need to unwind through system + libraries that are linked with the shared unwinder in libunwind (or libgcc_s + for OSX 10.4/5 [darwin8/9]). - For -static-libgcc: < 10.6, use the unwinder in libgcc_eh (and find - the emultls impl. there too). + When -static-libgcc is forced: < 10.6, use the unwinder in libgcc_eh (and + find the emultls impl. there too). For -static-libgcc: >= 10.6, the unwinder *still* comes from libSystem and we find the emutls impl from lemutls_w. In either case, the builtins etc. - are linked from -lgcc. + are linked from -lgcc. The eh library is still available so that it could + be specified explicitly if there is some reason to do so. When we have specified shared-libgcc or any case that might require exceptions, we pull the libgcc content (including emulated tls) from - -lgcc_s.1 in GCC and the unwinder from /usr/lib/libgcc_s.1 for < 10.6 and + -lgcc_s.1.1 in GCC and the unwinder from /usr/lib/libgcc_s.1 for < 10.6 and libSystem for >= 10.6 respectively. Otherwise, we just link the emutls/builtins from convenience libs. - If we need exceptions, prior to 10.3.9, then we have to link the static - eh lib, since there's no shared version on the system. - - In all cases, libgcc_s.1 will be installed with the compiler, or any app - built using it, so we can link the builtins and emutls shared on all. - We have to work around that DYLD_XXXX are disabled in macOS 10.11+ which means that any bootstrap trying to use a shared libgcc with a bumped SO- name will fail. This means that we do not accept shared libgcc for these - versions. + versions (the primary reason for forcing a shared libgcc was that it + contained the unwinder on Darwin8 and 9). - For -static-libgcc: >= 10.6, the unwinder *still* comes from libSystem and - we find the emutls impl from lemutls_w. In either case, the builtins etc. - are linked from -lgcc. -> - Otherwise, we just link the shared version of gcc_s.1.1 and pick up - exceptions: + When using the shared version of gcc_s.1.1 the unwinder is provided by: * Prior to 10.3.9, then we have to link the static eh lib, since there - is no shared version on the system. + is no shared unwinder version on the system. * from 10.3.9 to 10.5, from /usr/lib/libgcc_s.1.dylib * from 10.6 onwards, from libSystem.dylib - - In all cases, libgcc_s.1.1 will be installed with the compiler, or any app - built using it, so we can link the builtins and emutls shared on all. */ #undef REAL_LIBGCC_SPEC #define REAL_LIBGCC_SPEC \ |