[PATCH v2] LoongArch: Adjust C++ multilib header layout.

[PATCH v2] LoongArch: Adjust C++ multilib header layout.

[Yang Yujie]

For LoongArch, the toplevel library build is always aliased to
one of the multilib variants.  This patch installs it with the
actual MULTISUBDIR (instead of ".") so that the headers can be
reached by the compiler.

This patch is an update of
https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629435.html

libstdc++-v3/ChangeLog:

	* configure.host: Register t-loongarch in tmake_file.
	* config/cpu/loongarch/t-loongarch: New file.  Manually refresh
	MULTISUBDIR with $(shell $(CXX) --print-multi-directory).
---
 libstdc++-v3/config/cpu/loongarch/t-loongarch | 1 +
 libstdc++-v3/configure.host                   | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 libstdc++-v3/config/cpu/loongarch/t-loongarch

diff --git a/libstdc++-v3/config/cpu/loongarch/t-loongarch b/libstdc++-v3/config/cpu/loongarch/t-loongarch
new file mode 100644
index 00000000000..adfc8ebb93e
--- /dev/null
+++ b/libstdc++-v3/config/cpu/loongarch/t-loongarch
@@ -0,0 +1 @@
+AM_MAKEFLAGS += " MULTISUBDIR=/$(shell $(CXX) --print-multi-directory)"
diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
index 9e7c7f02dfd..9dc42ad3edb 100644
--- a/libstdc++-v3/configure.host
+++ b/libstdc++-v3/configure.host
@@ -315,7 +315,10 @@ esac
 # Set any OS-dependent and CPU-dependent bits.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host}" in
-  *-*-linux* | *-*-uclinux*)
+ loongarch*)
+    tmake_file="cpu/loongarch/t-loongarch"
+    ;;
+ *-*-linux* | *-*-uclinux*)
     case "${host_cpu}" in
       i[567]86)
         abi_baseline_pair=i486-linux-gnu
-- 
2.36.0

Re: [pushed][PATCH v2] LoongArch: Adjust C++ multilib header layout.

[chenglulu]

PUshed to r14-3803.

在 2023/9/7 下午2:50, Yang Yujie 写道:
> For LoongArch, the toplevel library build is always aliased to
> one of the multilib variants.  This patch installs it with the
> actual MULTISUBDIR (instead of ".") so that the headers can be
> reached by the compiler.
>
> This patch is an update of
> https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629435.html
>
> libstdc++-v3/ChangeLog:
>
> 	* configure.host: Register t-loongarch in tmake_file.
> 	* config/cpu/loongarch/t-loongarch: New file.  Manually refresh
> 	MULTISUBDIR with $(shell $(CXX) --print-multi-directory).
> ---
>   libstdc++-v3/config/cpu/loongarch/t-loongarch | 1 +
>   libstdc++-v3/configure.host                   | 5 ++++-
>   2 files changed, 5 insertions(+), 1 deletion(-)
>   create mode 100644 libstdc++-v3/config/cpu/loongarch/t-loongarch
>
> diff --git a/libstdc++-v3/config/cpu/loongarch/t-loongarch b/libstdc++-v3/config/cpu/loongarch/t-loongarch
> new file mode 100644
> index 00000000000..adfc8ebb93e
> --- /dev/null
> +++ b/libstdc++-v3/config/cpu/loongarch/t-loongarch
> @@ -0,0 +1 @@
> +AM_MAKEFLAGS += " MULTISUBDIR=/$(shell $(CXX) --print-multi-directory)"
> diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
> index 9e7c7f02dfd..9dc42ad3edb 100644
> --- a/libstdc++-v3/configure.host
> +++ b/libstdc++-v3/configure.host
> @@ -315,7 +315,10 @@ esac
>   # Set any OS-dependent and CPU-dependent bits.
>   # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
>   case "${host}" in
> -  *-*-linux* | *-*-uclinux*)
> + loongarch*)
> +    tmake_file="cpu/loongarch/t-loongarch"
> +    ;;
> + *-*-linux* | *-*-uclinux*)
>       case "${host_cpu}" in
>         i[567]86)
>           abi_baseline_pair=i486-linux-gnu