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Date: Tue, 28 May 2019 22:19:18 +0200
From: Ferdi265 <theferdi265@...il.com>
To: musl@...ts.openwall.com
Subject: [PATCH] fix musl-gcc.specs.sh to correctly handle -static-pie
Hello,
Today I wanted to use musl-gcc to build -static-pie binaries. I noticed
that this does not work (musl-libc is still linked as a shared library
and is also still requested as an interpreter).
Looking into the musl-gcc.specs file the bug was obvious: rcrt1.o was
not used as a startfile, and neither -no-dynamic-linker nor -static were
passed to the linker.
This patch fixes this by actually using rcrt1.o and passing the linker
options when -static-pie is given.
I don't have much experience with the specifics of gcc .spec files and
which options need to be passed, but this seems to work with all
variations of -shared, -static, and -static-pie that I've tried.
Here (https://github.com/Ferdi265/musl) is the repository with the patch
on GitHub, and I've also attached the patch below.
Greetings,
Ferdinand "Ferdi265" Bachmann
--- PATCH BELOW ---
From 070bce8f7e508a951d3b65da227b2fca3a65f37b Mon Sep 17 00:00:00 2001
From: Ferdinand Bachmann <theferdi265@...il.com>
Date: Tue, 28 May 2019 21:53:25 +0200
Subject: [PATCH] fix musl-gcc.specs.sh to correctly handle -static-pie
---
tools/musl-gcc.specs.sh | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/musl-gcc.specs.sh b/tools/musl-gcc.specs.sh
index 30492574..7206cb25 100644
--- a/tools/musl-gcc.specs.sh
+++ b/tools/musl-gcc.specs.sh
@@ -17,13 +17,13 @@ cat <<EOF
libgcc.a%s %:if-exists(libgcc_eh.a%s)
*startfile:
-%{!shared: $libdir/Scrt1.o} $libdir/crti.o crtbeginS.o%s
+%{static-pie: $libdir/rcrt1.o} %{!static-pie: %{!shared:
$libdir/Scrt1.o}} $libdir/crti.o crtbeginS.o%s
*endfile:
crtendS.o%s $libdir/crtn.o
*link:
--dynamic-linker $ldso -nostdlib %{shared:-shared} %{static:-static}
%{rdynamic:-export-dynamic}
+%{static-pie:-no-dynamic-linker -static} %{!static-pie:-dynamic-linker
$ldso} -nostdlib %{shared:-shared} %{static:-static}
%{rdynamic:-export-dynamic}
*esp_link:
--
2.21.0
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