From a160cbfa073e8499026063d2d3882b2117b4ced7 Mon Sep 17 00:00:00 2001
From: Bryan Drewery <bdrewery@FreeBSD.org>
Date: Tue, 31 Oct 2017 00:03:36 +0000
Subject: [PATCH] DIRDEPS_BUILD: libgcc now depends on MK_LLVM_LIBUNWIND

The dependency on gnu/lib/libgcc or lib/libgcc* is determined
at 'make dirdeps' time.

Sponsored by:	Dell EMC Isilon
---
 lib/libgcc_eh/Makefile.depend               | 13 +++++++++++++
 lib/libgcc_eh/Makefile.inc                  |  3 ++-
 lib/libgcc_s/Makefile.depend                | 16 ++++++++++++++++
 share/mk/local.dirdeps.mk                   | 15 ++++++++++++++-
 share/mk/local.gendirdeps.mk                |  3 +++
 targets/pseudo/userland/gnu/Makefile.depend |  5 ++++-
 targets/pseudo/userland/lib/Makefile.depend |  6 ++++++
 7 files changed, 58 insertions(+), 3 deletions(-)
 create mode 100644 lib/libgcc_eh/Makefile.depend
 create mode 100644 lib/libgcc_s/Makefile.depend

diff --git a/lib/libgcc_eh/Makefile.depend b/lib/libgcc_eh/Makefile.depend
new file mode 100644
index 000000000000..18be76b0cb6f
--- /dev/null
+++ b/lib/libgcc_eh/Makefile.depend
@@ -0,0 +1,13 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	include \
+	include/xlocale \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/lib/libgcc_eh/Makefile.inc b/lib/libgcc_eh/Makefile.inc
index 6337f3890e18..d69084f059cf 100644
--- a/lib/libgcc_eh/Makefile.inc
+++ b/lib/libgcc_eh/Makefile.inc
@@ -29,7 +29,8 @@ CXXFLAGS+=	-std=c++11
 .endif
 CXXFLAGS+=	-fno-rtti
 STATIC_CXXFLAGS+= -fvisibility=hidden -fPIC
+# Probably need to just move this earlier or use CXXFLAGS
 .if ${MK_DIRDEPS_BUILD} == "yes"
 # Avoid dependency on lib/libc++
-CFLAGS+=	-I${SRCTOP}/contrib/libc++/include
+CFLAGS+=	-isystem ${SRCTOP}/contrib/libc++/include -nostdinc++
 .endif
diff --git a/lib/libgcc_s/Makefile.depend b/lib/libgcc_s/Makefile.depend
new file mode 100644
index 000000000000..2f6d8d110c49
--- /dev/null
+++ b/lib/libgcc_s/Makefile.depend
@@ -0,0 +1,16 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	gnu/lib/csu \
+	include \
+	include/xlocale \
+	lib/${CSU_DIR} \
+	lib/libc \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/share/mk/local.dirdeps.mk b/share/mk/local.dirdeps.mk
index fd675a9fcb08..45581da7c0a7 100644
--- a/share/mk/local.dirdeps.mk
+++ b/share/mk/local.dirdeps.mk
@@ -76,6 +76,19 @@ DIRDEPS += \
 	cddl/usr.bin/ctfmerge.host
 .endif
 
+# Add in proper libgcc (gnu or LLVM) if not building libcc and libc is needed.
+# Add both gcc_s and gcc_eh as dependencies as the decision to build
+# -static or not is not known here.
+.if ${DEP_RELDIR:M*libgcc*} == "" && ${DIRDEPS:Mlib/libc}
+.if ${MK_LLVM_LIBUNWIND} == "yes"
+DIRDEPS+= \
+	lib/libgcc_eh \
+	lib/libgcc_s
+.else
+DIRDEPS+= gnu/lib/libgcc
+.endif
+.endif
+
 # Bootstrap support.  Give hints to DIRDEPS if there is no Makefile.depend*
 # generated yet.  This can be based on things such as SRC files and LIBADD.
 # These hints will not factor into the final Makefile.depend as only what is
@@ -124,7 +137,6 @@ _SRCS= ${SRCS} ${_PROGS_SRCS}
 # Has C files. The C_DIRDEPS are shared with C++ files as well.
 C_DIRDEPS= \
 	gnu/lib/csu \
-	gnu/lib/libgcc \
 	include \
 	include/arpa \
 	include/protocols \
@@ -135,6 +147,7 @@ C_DIRDEPS= \
 	lib/libc \
 	lib/libcompiler_rt \
 
+# libgcc is needed as well but is added later.
 
 .if ${MK_GSSAPI} != "no"
 C_DIRDEPS+=  include/gssapi
diff --git a/share/mk/local.gendirdeps.mk b/share/mk/local.gendirdeps.mk
index 5df941602f77..009e10d8d494 100644
--- a/share/mk/local.gendirdeps.mk
+++ b/share/mk/local.gendirdeps.mk
@@ -10,6 +10,9 @@ GENDIRDEPS_FILTER+= \
 	Ngnu/lib/libssp/libssp_nonshared \
 	Ncddl/usr.bin/ctf* \
 	Nlib/libc_nonshared \
+	Ngnu/lib/libgcc \
+	Nlib/libgcc_eh \
+	Nlib/libgcc_s \
 	Ntargets/pseudo/stage* \
 	Ntools/*
 
diff --git a/targets/pseudo/userland/gnu/Makefile.depend b/targets/pseudo/userland/gnu/Makefile.depend
index 5929ca4612c1..00c280e9e42e 100644
--- a/targets/pseudo/userland/gnu/Makefile.depend
+++ b/targets/pseudo/userland/gnu/Makefile.depend
@@ -9,7 +9,6 @@
 DIRDEPS = \
 	gnu/lib/csu \
 	gnu/lib/libdialog \
-	gnu/lib/libgcc \
 	gnu/lib/libgcov \
 	gnu/lib/libgomp \
 	gnu/lib/libreadline/history/doc \
@@ -45,4 +44,8 @@ DIRDEPS = \
 DIRDEPS+= gnu/usr.bin/dtc
 .endif
 
+.if ${MK_LLVM_LIBUNWIND} == "no"
+DIRDEPS+= gnu/lib/libgcc
+.endif
+
 .include <dirdeps.mk>
diff --git a/targets/pseudo/userland/lib/Makefile.depend b/targets/pseudo/userland/lib/Makefile.depend
index 2735e3b8ca15..a1b9769749b5 100644
--- a/targets/pseudo/userland/lib/Makefile.depend
+++ b/targets/pseudo/userland/lib/Makefile.depend
@@ -224,6 +224,12 @@ DIRDEPS+= lib/libgpio
 DIRDEPS+= lib/libefivar
 .endif
 
+.if ${MK_LLVM_LIBUNWIND} != "no"
+DIRDEPS+= \
+	lib/libgcc_eh \
+	lib/libgcc_s
+.endif
+
 .if ${MK_OFED} != "no"
 DIRDEPS+= \
 	contrib/ofed/usr.lib/libcxgb4 \