From: mengqinggang <mengqinggang@loongson.cn>
Date: Thu, 11 Dec 2025 06:13:55 +0000 (+0800)
Subject: LoongArch: Add support for libgcc on LA32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a79d9b6dbfb485055dd6cad2981dead4407d3b7d;p=thirdparty%2Fgcc.git

LoongArch: Add support for libgcc on LA32

LA32 does not support extreme code mode, change to medium code model on LA32.

libgcc/ChangeLog:

	* configure: Regenerate.
	* configure.ac:
	* config/loongarch/t-crtstuff-la32: New file.
	* config/loongarch/t-crtstuff: Rename to t-crtstuff-la64.

Reviewed-by: Xi Ruoyao <xry111@xry111.site>
Reviewed-by: Lulu Cheng <chenglulu@loongson.cn>
---

diff --git a/libgcc/config/loongarch/t-crtstuff-la32 b/libgcc/config/loongarch/t-crtstuff-la32
new file mode 100644
index 00000000000..d2bc8e5e79f
--- /dev/null
+++ b/libgcc/config/loongarch/t-crtstuff-la32
@@ -0,0 +1,11 @@
+# -fasynchronous-unwind-tables is on by default for LoongArch.
+# We turn it off for crt*.o because it would make __EH_FRAME_BEGIN__ point
+# to .eh_frame data from crtbeginT.o instead of the user-defined object
+# during static linking.
+CRTSTUFF_T_CFLAGS += -fno-omit-frame-pointer -fno-asynchronous-unwind-tables
+
+# As shown in the test case PR118844, when using lld for linking,
+# it fails due to B26 in crtbeginS.o causing the link to exceed the range.
+# Therefore, the issue was resolved by adding the compilation option
+# "-mcmodel=extreme" when compiling crtbeginS.o.
+CRTSTUFF_T_CFLAGS_S += -mcmodel=medium
diff --git a/libgcc/config/loongarch/t-crtstuff b/libgcc/config/loongarch/t-crtstuff-la64
similarity index 100%
rename from libgcc/config/loongarch/t-crtstuff
rename to libgcc/config/loongarch/t-crtstuff-la64
diff --git a/libgcc/configure b/libgcc/configure
index fe7a21c296c..8cdc021f9c1 100755
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -5397,6 +5397,18 @@ case ${host} in
 esac
 
 
+case ${host} in
+loongarch32*-*-*)
+  tmake_file="${tmake_file} loongarch/t-crtstuff-la32"
+  ;;
+esac
+
+case ${host} in
+loongarch64*-*-*)
+  tmake_file="${tmake_file} loongarch/t-crtstuff-la64"
+  ;;
+esac
+
 # Check if xtensa target is configured for windowed ABI and thus needs to use
 # custom unwind code.
 # This is after config.host so we can augment tmake_file.
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index 59452436bd8..1ae782c480c 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -530,6 +530,18 @@ case ${host} in
 esac
 AC_SUBST(solaris_ld_v2_maps)
 
+case ${host} in
+loongarch32*-*-*)
+  tmake_file="${tmake_file} loongarch/t-crtstuff-la32"
+  ;;
+esac
+
+case ${host} in
+loongarch64*-*-*)
+  tmake_file="${tmake_file} loongarch/t-crtstuff-la64"
+  ;;
+esac
+
 # Check if xtensa target is configured for windowed ABI and thus needs to use
 # custom unwind code.
 # This is after config.host so we can augment tmake_file.