${MAKE} bootstrap: Build bootkits with -static-libgcc

We don't want our bootkits to have a run-time dependency on libgcc. In
fact GHC's implementation of Haskell exception handling does not
depend on libgcc's facilities so it is attractive to do the same for
"normal" build... but we can't. This is because Haskell programs may
call C functions via FFI, and those C functions may call C++ functions
in turn, possibly in a different shared library.

But on some platforms, gcc automagically inserts a dependency on a
shared libgcc when -lpthread is given, which is seemingly unavoidable.

1 files changed, 24 insertions, 6 deletions

diff --git a/lang/ghc7/bootstrap.mk b/lang/ghc7/bootstrap.mk
index 416fcc895e8..5e06fc393ca 100644
--- a/lang/ghc7/bootstrap.mk
+++ b/lang/ghc7/bootstrap.mk
@@ -1,4 +1,4 @@
-# $NetBSD: bootstrap.mk,v 1.15 2015/02/05 00:38:14 pho Exp $
+# $NetBSD: bootstrap.mk,v 1.16 2015/02/06 06:57:13 pho Exp $
 # -----------------------------------------------------------------------------
 # Select a bindist of bootstrapping compiler based on a per-platform
 # basis.
@@ -85,11 +85,31 @@ pre-configure:
 # unusable.
 #
 
-# Gather information about packages on which bootkit depends.
+# We don't want our bootkits to have a run-time dependency on
+# libgcc. In fact GHC's implementation of Haskell exception handling
+# does not depend on libgcc's facilities so it is attractive to do the
+# same for "normal" build... but we can't. This is because Haskell
+# programs may call C functions via FFI, and those C functions may
+# call C++ functions in turn, possibly in a different shared library.
+.include "../../mk/compiler.mk"
+.if make(bootstrap) && !empty(CC_VERSION:Mgcc-*)
+# But on some platforms, gcc automagically inserts a dependency on a
+# shared libgcc when -lpthread is given, which is seemingly
+# unavoidable.
+LDFLAGS+=	-static-libgcc
+.endif
+
+# Gather information about packages on which bootkit depends. It will
+# be used in the post-bootstrap phase.
 BOOT_GHC_DEPS:=		curses iconv
 BOOT_GHC_PKGSRC_DEPS:=	# empty
 .for pkg in ${BOOT_GHC_DEPS}
 
+# NOTE: pkglint(1) complains for including these builtin.mk files,
+# telling that we must include buildlink3.mk instead. But then how do
+# we get variables like USE_BUILTIN.${pkg} defined before including
+# ../../mk/bsd.pkg.mk, given that ../../mk/bsd.buildlink3.mk isn't
+# protected against multiple inclusion?
 CHECK_BUILTIN.${pkg}:=	yes
 .  if ${pkg} == "curses"
 .    include "../../mk/curses.builtin.mk"
@@ -105,8 +125,8 @@ BOOT_GHC_PKGSRC_DEPS+=	${pkg}
 .  endif
 .endfor
 
-# Compiler wrappers must not remove -I/-L flags for this directory
-# tree, otherwise the GHC we are going to use for building our
+# Compiler wrappers must not remove -I/-L flags for the installed
+# GHC's libdir, otherwise the GHC we are going to use for building our
 # bootstraping kit will not work at all. Ideally it should be added to
 # BUILDLINK_PASSTHRU_DIRS only .if make(bootstrap), but then running
 # "${MAKE} wrapper" before "${MAKE} bootstrap" will result in a
@@ -202,8 +222,6 @@ post-bootstrap:
 	@${ECHO} "removes it."
 	@${ECHO}
 	@${ECHO} "Your bootstrap kit has the following run-time dependencies:"
-# TODO: It may depend also on GCC runtime so we want to report that,
-# but how?
 .for pkg in ${BOOT_GHC_DEPS}
 	@${PRINTF} "  * %-8s" "${pkg}:"
 .  if !empty(USE_BUILTIN.${pkg}:M[nN][oO])