[gcc r13-4002] libstdc++: Fix install-debug makefile target

[Jonathan Wakely]

https://gcc.gnu.org/g:3c6721796d8da82584559d0011b69ca3109eeff7

commit r13-4002-g3c6721796d8da82584559d0011b69ca3109eeff7
Author: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Date:   Mon Nov 14 10:13:47 2022 +0000

    libstdc++: Fix install-debug makefile target
    
    This target should have been changed by r13-3918-gba7551485bc576 and now
    fails.
    
    libstdc++-v3/ChangeLog:
    
            * src/Makefile.am (install-debug): Remove use of $(debugdir).
            * src/Makefile.in: Regenerate.

Diff:
---
 libstdc++-v3/src/Makefile.am | 4 ++--
 libstdc++-v3/src/Makefile.in | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/src/Makefile.am b/libstdc++-v3/src/Makefile.am
index b545ebf0dcf..59d992a091c 100644
--- a/libstdc++-v3/src/Makefile.am
+++ b/libstdc++-v3/src/Makefile.am
@@ -422,5 +422,5 @@ build-debug: stamp-debug $(debug_backtrace_supported_h)
 
 # Install debug library.
 install-debug: build-debug
-	(cd ${debugdir} && $(MAKE) CXXFLAGS='$(DEBUG_FLAGS)' \
-	toolexeclibdir=$(glibcxx_toolexeclibdir)/debug install) ;
+	$(MAKE) -C debug CXXFLAGS='$(DEBUG_FLAGS)' \
+	  toolexeclibdir=$(glibcxx_toolexeclibdir)/debug install
diff --git a/libstdc++-v3/src/Makefile.in b/libstdc++-v3/src/Makefile.in
index f54ee282fb0..b19eef0adc8 100644
--- a/libstdc++-v3/src/Makefile.in
+++ b/libstdc++-v3/src/Makefile.in
@@ -1142,8 +1142,8 @@ build-debug: stamp-debug $(debug_backtrace_supported_h)
 
 # Install debug library.
 install-debug: build-debug
-	(cd ${debugdir} && $(MAKE) CXXFLAGS='$(DEBUG_FLAGS)' \
-	toolexeclibdir=$(glibcxx_toolexeclibdir)/debug install) ;
+	$(MAKE) -C debug CXXFLAGS='$(DEBUG_FLAGS)' \
+	  toolexeclibdir=$(glibcxx_toolexeclibdir)/debug install
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.