Patch set updated for coreboot: buildgcc: Build GMP `--with-pic` if GCC defaults to `-pie`

[Nico Huber]

Nico Huber ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17936

-gerrit

commit 31c3dfeff1571d328a8b647e33648c356f582d64
Author: Nico Huber 
Date:   Thu Dec 22 16:05:54 2016 +0100

buildgcc: Build GMP `--with-pic` if GCC defaults to `-pie`

GCC 6 can optionally default to building all binaries as position
    independent executables (PIE). This breaks linking against static
    libraries that are compiled without position independent code (PIC).

Building GMP `--with-pic` in this case seems to be the least fragile
    solution.

TEST=Run `make all` and `make BUILDGCC_OPTIONS=-b build-i386` in
         util/crossgcc on Debian Stretch.

Change-Id: I5f3185af9c8d599379a628e18724b217b88be974
    Signed-off-by: Nico Huber 
---
 util/crossgcc/buildgcc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index 97c38b8..30e2188 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -515,6 +515,13 @@ set_hostcflags_from_gmp() {
 }

build_GMP() {
+	# Check if GCC enables `-pie` by default (possible since GCC 6).
+	# We need PIC in all static libraries then.
+	if "${CC}" -dumpspecs 2>/dev/null | grep -q '[{;][[:space:]]*:-pie>'
+	then
+		OPTIONS="$OPTIONS --with-pic"
+	fi
+
    CC="$CC" ../${GMP_DIR}/configure --disable-shared --enable-fat \
    	--prefix=$TARGETDIR $OPTIONS \
    	|| touch .failed