[PATCH 1/2] configure: Use -print-libgcc-file-name to detect compiler runtime

[PATCH 1/2] configure: Use -print-libgcc-file-name to detect compiler runtime

[Khem Raj]

This uses compiler to provide the path to its default runtime
library libgcc/compiler-rt, when using clang we can set

CC="clang --rtlib={compiler-rt|libgcc}" and it will find
the right compiler runtime when autodetecting it

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 configure | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/configure b/configure
index c2db298c..0c670dd8 100755
--- a/configure
+++ b/configure
@@ -587,6 +587,8 @@ tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
 tryldflag LDFLAGS_AUTO -Wl,-Bsymbolic-functions
 
 # Find compiler runtime library
+test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
+                 && tryldflag LIBCC "$try_libcc"
 test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
-- 
2.12.0

[PATCH 2/2] configure: Remove -lgcc_eh from LIBCC

[Khem Raj]

-lgcc_eh was needed with old gcc/arm toolchain where
div0 function in libgcc invoked an exception and
inturn  pulled in eh

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 0c670dd8..ca9a588f 100755
--- a/configure
+++ b/configure
@@ -589,7 +589,7 @@ tryldflag LDFLAGS_AUTO -Wl,-Bsymbolic-functions
 # Find compiler runtime library
 test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \
                  && tryldflag LIBCC "$try_libcc"
-test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh
+test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC
 test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt
 test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \
                  && tryldflag LIBCC "$try_libcc"
-- 
2.12.0

Re: [PATCH 1/2] configure: Use -print-libgcc-file-name to detect compiler runtime

[Dmitry Golovin]

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