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* [gcc r11-11334] c++, driver: Fix -static-libstdc++ for targets without Bstatic/dynamic.
@ 2024-04-22 13:10 Iain D Sandoe
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From: Iain D Sandoe @ 2024-04-22 13:10 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:8af693c4ae1a0f8cecef34e98dad1752ebf0bb75
commit r11-11334-g8af693c4ae1a0f8cecef34e98dad1752ebf0bb75
Author: Iain Sandoe <iain@sandoe.co.uk>
Date: Thu Jan 6 08:37:18 2022 +0000
c++, driver: Fix -static-libstdc++ for targets without Bstatic/dynamic.
The current implementation for swapping between the static and shared c++
runtimes relies on the static linker supporting Bstatic/dynamic which is
not available for every target (Darwin's linker does not support this).
Specs substitution (%s) is an alternative solution for this (which is what
Darwin uses for Fortran, D and Objective-C). However, specs substitution
requires that the '-static-libstdc++' be preserved in the driver's command
line. The patch here arranges for this to be done when the configuration
determines that linker support for Bstatic/dynamic is missing.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/cp/ChangeLog:
* g++spec.c (lang_specific_driver): Preserve -static-libstdc++ in
the driver command line for targets without -Bstatic/dynamic support
in their static linker.
(cherry picked from commit a846817739c1e7b930d593cd51963d6b46b5dfc6)
Diff:
---
gcc/cp/g++spec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/gcc/cp/g++spec.c b/gcc/cp/g++spec.c
index 3c9bd1490b4..984106f10dd 100644
--- a/gcc/cp/g++spec.c
+++ b/gcc/cp/g++spec.c
@@ -222,7 +222,12 @@ lang_specific_driver (struct cl_decoded_option **in_decoded_options,
case OPT_static_libstdc__:
library = library >= 0 ? 2 : library;
+#ifdef HAVE_LD_STATIC_DYNAMIC
+ /* Remove -static-libstdc++ from the command only if target supports
+ LD_STATIC_DYNAMIC. When not supported, it is left in so that a
+ back-end target can use outfile substitution. */
args[i] |= SKIPOPT;
+#endif
break;
case OPT_stdlib_:
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