Bug#1071173: haskell-pandoc-lua-engine: Use extra --ghc-options in d/rules on loong64

[zhangdandan]

Source: haskell-pandoc-lua-engine
Version: 0.2.0.1-1
Severity: important
Tags: ftbfs patch
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

The haskell-pandoc-lua-engine is blocked from building by haskell-pandoc 
in the Debian Package Auto-Building environment.
Compiling the haskell-pandoc-lua-engine failed for loong64 in my local ENV.
The error message is consistent with haskel-pandoc, and both are related 
to "relocation R_LARCH_B26 overflow ......" during static linking in the 
test-pandoc stage.
The build error log of haskell-pandoc-lua-engine from my local ENV is as 
follows,
```
[6 of 6] Linking 
dist-ghc/build/test-pandoc-lua-engine/test-pandoc-lua-engine
/usr/bin/ld.bfd: 
/usr/lib/ghc/lib/../lib/loongarch64-linux-ghc-9.4.7/rts-1.0.2/libHSrts-1.0.2.a(NonMovingMark.o): 
relocation R_LARCH_B26 overflow 0xfffffffff61da41c
Dump relocate record:
stack top        relocation name        symbol
at 
/usr/lib/ghc/lib/../lib/loongarch64-linux-ghc-9.4.7/rts-1.0.2/libHSrts-1.0.2.a(NonMovingMark.o)(.text+0xae4):
...
0x0000000000000000 R_LARCH_B16    `.L172'
......
```

There are two suggestions to solve "relocation R_LARCH_B26 overflow 
......" during static linking.
1.Add build rules to reduce binary size.
2.Disable tests in d/rules on loong64.
3.Add extra --ghc-options in d/rules on loong64 to increase 
jump-instructions' range.

It is recommended to use --ghc-options="-optc-mcmodel=medium" in d/rules 
for loong64.
Please consider the patch I attached.
With the attached patch, the haskell-pandoc-lua-engine was built 
successfully in my local ENV.


Your opinions are welcome.

Thanks,
Dandan Zhang

-------------- next part --------------
diff -Nru haskell-pandoc-lua-engine-0.2.0.1/debian/rules haskell-pandoc-lua-engine-0.2.0.1/debian/rules
--- haskell-pandoc-lua-engine-0.2.0.1/debian/rules	2024-01-04 00:32:40.000000000 +0000
+++ haskell-pandoc-lua-engine-0.2.0.1/debian/rules	2024-01-04 00:32:40.000000000 +0000
@@ -4,3 +4,8 @@
 
 include /usr/share/cdbs/1/rules/debhelper.mk
 include /usr/share/cdbs/1/class/hlibrary.mk
+
+ifneq (,$(filter $(DEB_BUILD_ARCH),loong64))
+DEB_SETUP_GHC_CONFIGURE_ARGS += --ghc-options="-optc-mcmodel=medium"
+endif
+