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clang: default to DWARF 4 as of FreeBSD 13

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FreeBSD previously defaulted to DWARF 2 because several tools (gdb,
ctfconvert, etc.) did not support later versions.  These have either
been fixed or are deprecated.

Note that gdb 6 still exists but has been moved out of $PATH into
/usr/libexec and is intended only for use by crashinfo(8).  The kernel
build sets the DWARF version explicitly via -gdwarf2, so this should
have no effect there.

PR:		234887 [exp-run]
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17930
This commit is contained in:
Ed Maste 2019-01-25 14:46:13 +00:00
parent 7dc90a1de0
commit ade4db4d04
2 changed files with 8 additions and 1 deletions
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7
contrib/llvm/tools/clang/lib/Driver/ToolChains/FreeBSD.cpp
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@ -357,6 +357,13 @@ ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
return ToolChain::CST_Libstdcxx;
}
unsigned FreeBSD::GetDefaultDwarfVersion() const {
// Default to use DWARF 2 before FreeBSD 13.
if (getTriple().getOSMajorVersion() < 13)
return 2;
return 4;
}
void FreeBSD::addLibStdCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {

2
contrib/llvm/tools/clang/lib/Driver/ToolChains/FreeBSD.h
View File

@ -70,7 +70,7 @@ public:
const llvm::opt::ArgList &Args) const override;
bool isPIEDefault() const override;
SanitizerMask getSupportedSanitizers() const override;
unsigned GetDefaultDwarfVersion() const override { return 2; }
unsigned GetDefaultDwarfVersion() const override;
// Until dtrace (via CTF) and LLDB can deal with distributed debug info,
// FreeBSD defaults to standalone/full debug info.
bool GetDefaultStandaloneDebug() const override { return true; }