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This addresses a number of issues in the X86 Darwin 32b port for libffi. 1. The pic symbol stubs are weak definitions; the correct section placement for these depends on the linker version in use. We do not have access to that information, but we can use the target OS version (assumes that the user has installed the latest version of xcode available). When a coalesced section is in use (OS versions earlier than Darwin12 / OSX 10.8), its name must differ from __TEXT,__text since otherwise that would correspond to altering the attributes of the .text section (which produces a diagnostic from the assembler). Here we use __TEXT, __textcoal_nt for this which is what GCC emits for these stubs. For later versions than Darwin 12 (OS X 10.8) we can place the stubs in the .text section (if we do not we get a diagnostic from clang -cc1as saying that the use of coalesced sections for this is deprecated). 2. The EH frame is specified manually, since there is no support for .cfi_ directives in 'cctools' assemblers. The implementation needs to provide offsets for CFA advance, code size and to the CIE as signed values rather than relocations. However the cctools assembler will produce a relocation for expressions like ' .long Lxx-Lyy' which then leads to a link-time error. We correct this by forming the offset values using ' .set' directives and then assigning the results of them. 3. The register numbering used by m32 X86 Darwin EH frames is not the same as the DWARF debug numbering (the Frame and Stack pointer numbers are swapped). 4. The FDE address encoding used by the system tools is '0x10' (PCrel + abs) where the value provided was PCrel + sdata4. 5. GCC does not use compact unwind at present, and it was not implemented until Darwin10 / OSX 10.6. There were some issues with function location in 10.6 so that the solution here suppresses emitting the compact unwind section until Darwin11 / OSX 10.7. Signed-off-by: Iain Sandoe <iain@sandoe.co.uk> libffi/ChangeLog: * src/x86/sysv.S (COMDAT): Amend section use for Darwin, accounting cases where coalesced is needed. (eh_frame): Rework to avoid relocs that cause builf fails on earlier Darwin. Adjust register numbers to account for X86 m32 Darwin differences between EH and debug.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.