From bef017f5fe7f65491f7efb3c6217e96823f9649e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= <mat@brain-dump.org>
Date: Tue, 26 Apr 2016 08:20:20 +0200
Subject: build: try to produce a statically linked position independent
 executable

In theory this should be as simple as:

 $ cc -fPIE -pie --static helloworld.c

But unfortunately by default this will always add a PT_INTERP referencing
the dynamic loader/linker. On latest binutils >=2.26 this can be worked
around by supplying --no-dynamic-linker. Also tweak the musl-gcc wrapper
to use rcrt1.o as startup file.
---
 GNUmakefile | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'GNUmakefile')

diff --git a/GNUmakefile b/GNUmakefile
index 015ca92..99a2f75 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -51,6 +51,8 @@ dependency/build/libmusl-extract: dependency/sources/$(LIBMUSL).tar.gz | depende
 	touch $@
 
 dependency/build/libmusl-configure: dependency/build/libmusl-extract
+	# tweak musl gcc wrapper/spec file to support static PIE linking
+	sed -i 's#%{pie:S}crt1.o#%{pie:%{static:rcrt1.o%s;:Scrt1.o%s};:crt1.o%s}#' $(dir $<)/$(LIBMUSL)/tools/musl-gcc.specs.sh
 	cd $(dir $<)/$(LIBMUSL) && ./configure --prefix=$(DEPS_PREFIX) --syslibdir=$(DEPS_PREFIX)/lib
 	touch $@
 
-- 
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