[PATCH] D14655: [mips] Make the .eh_frame writable on FreeBSD to work around issues in the old linker.

[Daniel Sanders via llvm-commits]

dsanders created this revision.
dsanders added subscribers: emaste, seanbruno, llvm-commits.

The Mips port of FreeBSD is currently using an old linker (GNU ld 2.17.50 [FreeBSD]
2007-07-03) which seems to be unable to fully support read-only .eh_frame sections.
Work around this for now by making them writeable on this target.

The linker must also be patch to support R_MIPS_PC32 as discussed in PR25176.

http://reviews.llvm.org/D14655

Files:
  lib/MC/MCObjectFileInfo.cpp

Index: lib/MC/MCObjectFileInfo.cpp
===================================================================
--- lib/MC/MCObjectFileInfo.cpp
+++ lib/MC/MCObjectFileInfo.cpp
@@ -432,6 +432,13 @@
   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
     EHSectionFlags |= ELF::SHF_WRITE;
 
+  // The Mips port of FreeBSD currently has difficulty with read only .eh_frame
+  // due to an old linker. Work around this for now by making it writable.
+  if (T.isOSFreeBSD() &&
+      (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel ||
+       T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el))
+    EHSectionFlags |= ELF::SHF_WRITE;
+
   // ELF
   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);


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